How to check your chromebook’s battery health

Every now and then, a Chromebook might refuse to charge. Hardware issues are usually to blame in such situations, but the software might cause charging problems too. Let’s see how to deal with a Chromebook that won’t charge.

How to check your chromebook’s battery health

Hardware Issues

A Chromebook, like any other electronic device, might encounter battery charging issues and stop charging regularly. When you see that your Chromebook takes an unusually long time to charge or completely refuses to charge, you should examine the hardware before resorting to software fixes.

Unplug the Charger and Plug It Back in

If your Chromebook refuses to cooperate and charge the battery, you should disconnect and reconnect the charger. It is surprising how many times this simple thing does the trick.

  1. Unplug the charger from both the wall and your device.
    How to check your chromebook’s battery health
  2. First, plug it back into the Chromebook, then plug it into the wall.
  3. Give your Chromebook 30 minutes.

Check the Power Cord and Charging Port

Next, you should check whether the charger and the cord are okay. Oftentimes, a Chromebook won’t charge because the cable is damaged or the charger is malfunctioning. Look for any signs of physical damage.

If everything is fine, you should inspect the charging port. Also, check whether there’s dust, dirt, or any other type of debris within the port. If there is, clean it and reconnect the power cord. Also, you might want to use a spare power cord, if you have one, to further test the charging port.

Check the Battery

You might also want to inspect the battery in these cases, but this isn’t an option for everyone.

If the battery is difficult to remove or if removing it would void the warranty, it is best not to touch it. However, if it is replaceable and accessible, you should inspect it. Look for the signs of physical damage. Also, check whether it’s swollen or hot.

If you have a spare battery, you might want to try replacing the original one to see whether the problem goes away. Have in mind that laptop and tablet batteries have a limited number of charge cycles they can withstand before they start deteriorating. It’s possible that the battery in your Chromebook is simply nearing the end of its life.

Software Issues

If there’s nothing wrong with the hardware, you should proceed with software troubleshooting methods. Here are some of the potential solutions.

Reboot

Sometimes, overflowing cache memory or minor software bugs and glitches might influence your Chromebook’s ability to properly charge. To rule this possibility out, you should reboot your device. Here’s how it is done.

  1. Turn off your Chromebook.
    How to check your chromebook’s battery health
  2. Press and hold together the Power and Refresh buttons on the Chromebook’s keyboard.
  3. Keep the Refresh button pressed until the device boots up.

In case you have a Chromebook tablet, here’s how to reboot it.

  1. Press together the Power and Volume Up buttons and hold them for 10 seconds. If necessary, keep them pressed longer.
  2. When the tablet boots up, release the keys.

However, some laptop models might have special reboot sequences and procedures. Refer to this page for a complete list of laptops that need to be rebooted in a special way (the “Other ways” section). Follow the instructions under your Chromebook’s brand and model name.

After the reboot, check whether the charging light comes on. If the reboot didn’t solve the issue, try it once more. After the second reboot, unplug the charger from both your device and the power outlet. This time, plug it back into the power outlet first and then into the Chromebook. If this method proves successful, you should charge your Chromebook for an hour. If it’s not, move on to the next method.

Reset to Factory Settings

In case you have enough battery juice left, you might want to consider a factory reset at this point. Before you reset your device, you should back up important data to an external hard drive or to Google Drive, and then sync your account settings with your Google account.

Sync and Backup

To synchronize your account settings, follow these steps.

  1. Exit to Home screen and click on the time.
  2. Click on Settings in the pop-up menu.
  3. Go to the People section.
  4. Next, go to the Sync tab.
  5. Pick what you’d like to synchronize.
  6. For additional security, you can go to the Encryption Options section and set a password that will protect and encrypt all your synced data.

Save Files to Google Drive

If you don’t have an external hard drive at hand, you might want to save important files to Google Drive. Here’s how to do it.

  1. Browse for the file you’d like to save.
  2. When you find it, right-click on it and select Save. Alternatively, click on it and press Ctrl and S on your keyboard.
  3. Give your file a name and, optionally, change its file type in the drop-down menus.
  4. Finally, select a folder on Google Drive where you’d like to save your file and click the Save button.

Repeat this process for every important file you’d like to upload.

Factory Reset

Now, let’s get to the factory reset. Follow these steps.

  1. Sign out of your device.
  2. Go to the Home screen and click on the time.
  3. When the menu pops up, click on the Settings. It’s at the bottom of the menu.
  4. Click on the Advanced button on the left-side menu in the Settings window.
  5. Select the Reset Settings tab.
  6. Next, select the Powerwash option.
  7. Select Restart.
    How to check your chromebook’s battery health
  8. Pick the Powerwash option once more in the next dialog box.
  9. Chromebook will perform the factory reset. When it boots up, sign in to your Google account.
  10. Follow the setup wizard.

Try charging your Chromebook again.

You Can Always Ask Google

In case none of the above methods helped, you might want to contact your Chromebook manufacturer or Google support.

Have you ever had charging issues in the past? How did you solve them? Have we missed the solution that helped you? If so, share it in the comments section below.

With just two commands you can learn more about your Chromebook battery than what the system tray indicator tells you.

How to check your chromebook’s battery health

If you’re Chromebook user you probably enjoy a fairly significant daily life from that battery. I for one, often opt to use my Pixel 2 over my MacBook Pro, because 12 hours of battery life beats six hours any day.

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As you use Chromebook, you can see the battery indicator ever so slowly trickling down (ever so slowly being the operative phrase). But that system tray indicator is really only an estimate of how your battery is fairing. What if you wanted to really know the health of your Chromebook battery?

Two tools

Fortunately, the developers thought to include a couple of tools in the operating system to help you. Said tools are commands that will report back the true health and other information about your battery. The first command immediately indicates the health of the battery (in a percentage) and then runs a five-minute battery discharge test.

The second command reports a good amount of information about the battery, but more importantly, the cycle count. This will tell you how many charge cycles your Chromebook has gone through (understanding most batteries have around 500 charge cycles).

Run commands

How do you run these commands? First, you must open the Crosh tool by hitting the [Ctrl]+[Alt]+[T] key combination. From the Crosh terminal, type the command battery_test to view battery health and run the discharge test.

The second command (to view the battery information, including cycle count) is battery_firmware info. With this information, you can get a better understanding of how long that battery might have left before it won’t charge as expected. Putting those two bits of information together, know that the battery health percentage is the amount (out of 100%) that your battery can currently charge. So if your battery health is 98.63%, and your battery has 210 cycles, that means the highest your battery will charge is 98.63%, and you have roughly 290 full-charge cycles left.

Keeping tabs on Chromebook battery health helps you get the most out of your hardware.

How to check your chromebook’s battery health

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With just two commands you can learn more about your Chromebook battery than what the system tray indicator tells you.

How to check your chromebook’s battery health

If you’re Chromebook user you probably enjoy a fairly significant daily life from that battery. I for one, often opt to use my Pixel 2 over my MacBook Pro, because 12 hours of battery life beats six hours any day.

More about Mobility

As you use Chromebook, you can see the battery indicator ever so slowly trickling down (ever so slowly being the operative phrase). But that system tray indicator is really only an estimate of how your battery is fairing. What if you wanted to really know the health of your Chromebook battery?

Two tools

Fortunately, the developers thought to include a couple of tools in the operating system to help you. Said tools are commands that will report back the true health and other information about your battery. The first command immediately indicates the health of the battery (in a percentage) and then runs a five-minute battery discharge test.

The second command reports a good amount of information about the battery, but more importantly, the cycle count. This will tell you how many charge cycles your Chromebook has gone through (understanding most batteries have around 500 charge cycles).

Run commands

How do you run these commands? First, you must open the Crosh tool by hitting the [Ctrl]+[Alt]+[T] key combination. From the Crosh terminal, type the command battery_test to view battery health and run the discharge test.

The second command (to view the battery information, including cycle count) is battery_firmware info. With this information, you can get a better understanding of how long that battery might have left before it won’t charge as expected. Putting those two bits of information together, know that the battery health percentage is the amount (out of 100%) that your battery can currently charge. So if your battery health is 98.63%, and your battery has 210 cycles, that means the highest your battery will charge is 98.63%, and you have roughly 290 full-charge cycles left.

Keeping tabs on Chromebook battery health helps you get the most out of your hardware.

How to check your chromebook’s battery health

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For those who use their Chromebooks as a desktop via a docking station or simply don’t like to risk traveling with a laptop that’s not at 100% battery before they take off, they often leave it plugged in for the entire time they’re using it. Some people even leave their Chromebooks plugged in overnight like they do with their phones. Understandably, it gives them a sense of comfort and assurance. Today, we’ll explore whether or not this is has any adverse affects on your device and give you some tips and tricks for managing the health of your battery.

Batteries have memory too

Way back when, leaving a device plugged into a wall outlet for excessive amounts of time would cause the battery inside it to expand or explode, rendering it useless or even causing harm to those around it. Nowadays, that’s not really an issue thanks to most of our technology utilizing lithium-ion batteries as opposed to alkaline combined with a little something called ‘trickle charging’. The idea is that modern batteries have the ability to stop accepting a charge once they’re full. Because of this, it’s actually safe to leave your Chromebook charging overnight or for the duration of its active daily usage: but that doesn’t mean you ought to. According to Battery University’s analysis on the matter:

The lithium-ion battery works on ion movement between the positive and negative electrodes. In theory such a mechanism should work forever, but cycling, elevated temperature and aging decrease the performance over time. Manufacturers take a conservative approach and specify the life of Li-ion in most consumer products as being between 300 and 500 discharge/charge cycles. Battery University

So as you can see, the issue isn’t directly with over-charging your laptop, but rather with the battery temperature remaining elevated due to keeping it plugged in and eroding the ions, directly contributing to the longevity – or lack thereof – of your Chromebook’s battery. In other words, if you want your Chromebook to last for the entirely of its lifespan, it’s recommended that you charge and discharge it appropriately.

When should you charge your Chromebook?

With all of that out of the way, what is the best practice to follow after you take your shiny new Chromebook out of its box? A good analogy for this situation is that of a plant. If the plant needs water, you should water it. If it’s full of water, you should not water it, right? There’s a lot of battery science and conflicting information out there on the internet regarding best practices here, but keep it simple and unplug it if it’s almost full to prevent from overcharging it and plug it in when it’s almost dead so you don’t forget and accidentally let it die.

How to check the health of your battery

There is a little-known, easy way check on how your battery is doing. This isn’t the charge level of your battery but instead, the actual health. Simply open what’s known as the crosh terminal by pressing CTRL+ALT+T on your keyboard while in the Chrome browser and type in battery_test. Hit enter and you will see a percentage. The test won’t work properly if you have your charger plugged in, as you can see from the results below. This will show you how quickly you Chromebook’s battery is discharging as well as the overall percentage of battery capacity you have compared to when it was brand new and at 100%.

How to check your chromebook’s battery health

Use smart plugs for clever power management

If you’re staying at home and prefer using a desktop setup, it may be in your best interest to make your next Chrome OS device a Chromebox as opposed to a Chromebook because they are built to accept a constant charge and don’t require constant power management. Otherwise, if you prefer to have the desktop setup without sacrificing the portability of your Chromebook, a clever way to manage your battery is to use smart plugs to automate the charging and discharging of your battery.

A fun little trick is to maintain a schedule in the app for the smart plug of your choosing so that it only distributes power for about an hour around the time when you return home (when you normally plug it in) and for an hour prior to your bed time. This way, you can just leave the power cable plugged in to your Chromebook forever and it won’t destroy the health of your battery!

Tips and tricks for plugs and sockets

We also recommend you avoid plugging your Chromebook charger in to any faulty outlets. Getting the wiring in your home checked once a year is important and can prevent not only a fried laptop, but also house fires. Another way to prevent your battery from shorting out is to swap out your surge protectors once a year . Before I knew that these power strips could only withstand one lightning strike (one billion joules of energy in a fraction of a second), I basically just kept the same ones for many years. If you don’t, they’re basically just extra plugs that provide no protection whatsoever. You’ll want to buy surge protectors that are rated for at least 600 joules. That said, it is best you turn your Chromebook off or simply use it on battery power unplugged during a storm.

Lastly, only use the charger that came with your Chromebook. If you buy a third-party charger on Amazon or some other website, you risk potentially frying your laptop. A lot of these second hand chargers are not regulated and do not have the proper voltage and wattage. Not to mention Chromebooks use much less power than Windows laptops. Your best bet is to grab the specific model number of your Chromebook and find a charger that is explicitly stated to work with that model.

Where to store your Chromebook and where you shouldn’t

a lot of people who buy Chromebooks for their work truck or happen to need them for other conditions which expose them to extreme heat or cold. While some Chromebooks are built to take more of a beating , we don’t recommend subjecting them to any more strenuous conditions than they ought to be. Store your Chromebook in a cool, dry place. Avoid submerging it in water or spilling coffee on the keyboard. Only certain devices are built to withstand a spill, but even then they can only take a few ounces of liquid that is meant to be wiped off immediately. Any of these unsafe conditions may reduce the longevity of your battery or could destroy it immediately. Building new habits can be difficult, but the tips and tricks here will help you get the most out of your Chromebook purchase.

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Today we’ll show you an incredible method of creating and viewing the battery health of your Windows PC. This information can be extremely important in determining the overall condition of your laptop’s battery.

MacOS (or OSX) has always been great at having battery health information readily available for the customer, and easy to access It’s always nice to see the condition of your battery to give you an idea on if you’ll need a battery replacement in the near future.

In MacOS you click the Apple icon, then click “About this Mac” and you’ll find all the information about the battery under the “Power” Sub-menu. But if you’re a Windows user, there doesn’t appear to be anything like this within the menu’s.

What I love about Windows is the power of cmd and powershell. You can manipulate your machine in ways you never thought possible if you can master these two terminals. Windows has made it even better by combining the two in an application called “Windows Terminal” from the Microsoft store.

How to check battery health

First, in your Windows search bar type “powershell”. When you see the application come up (Windows Powershell), right-click on it and select “Run as administrator”. You require Administrator privileges when using the power configuration command. A blue colored terminal window show appear that looks something like this…

How to check your chromebook’s battery health

At the Windows Powershell prompt, type “powercfg /batteryreport /output “C:\battery-report.html” . This will generate a battery report for your machine.

How to check your chromebook’s battery health

Let me break down this line of code so you will remember it for the future. “powercfg” is simply just the command we are telling the computer to use. “/batteryreport” we are telling the computer that we would like a report for the installed battery. “/output” we are telling the computer that we want a print-out of this report for viewing. “C:\battery-report.html” we are specifying the name and path where we want this report to be saved. By typing “.html” at the end, we are telling the computer that this is the file type we’d like to view it in. You can save the file as a standard word document (.txt or .docx), but when you view it you will only see the raw html5 code. So it’s best just to always save the file as an html document.

Now that we’ve created and saved a copy of the battery report, let’s go have a look. Navigate to you “C:” drive and double click the “battery-report.html” file. It will open in your default browser and look something like this…

How to check your chromebook’s battery health

Battery Report

First, you’ll see a bit of information about your Windows machine. Computer name, bios version, OS version, etc. Under that you’ll see the subheading “Installed Batteries” which is the information we’re looking for. The 3 most important items are Design Capacity, Full Charge Capacity and Cycle Count. Design capacity is how much power the battery was designed to hold. Full charge capacity is how much it is capable of holding. And finally, cycle count, is how many times the battery has gone through a full cycle. A full cycle meaning that the battery has been fully depleted, then fully recharged.

In most cases, the full charge capacity will be slightly lower than the design capacity. This is normal as all lithium ion batteries degrade over a period of time. In some cases, the full charge capacity may be significantly lower than the design capacity. This is because the user has only partially charged it several times, over several months.

This report also comes in handy when purchasing a Windows laptop on the second hand market. The cycle count will give you an idea on how much the device has been used and the overall condition of the battery.

How to increase battery capacity

As lithium ion batteries age, they can lose their charge capacity. So it’s important to be aware of this, and know how to take care of your machine and it’s internal batteries. People often will only partially charge their devices, whether it’s their phone, tablet or laptop. Over a period of several months, if you continue to do this, it will decrease the overall capacity of your battery.

If your device falls within this category, it is recommended to calibrate your battery at least twice. This will bring up your full charge capacity a bit. It won’t bring it back up to the design charge capacity, but it should bring it up a bit and give you extended battery life.

Calibrate your battery / preserve battery health

To calibrate the battery, first charge it to 100%. Then use the device until it gets to about 10%. It is not recommended to discharge it fully, as this can damage lithium ion batteries. Once it’s reached 10%, turn off the device and let it charge to 100% without using it. Complete this process twice, and at least once every couple of months.

If you found this article helpful, please let us know in the comments below.

After more than two years of moderate usage (2-3 cycles per week), my Acer CB3-111 still has 94% battery health according to Crosh. Has anyone else's Chromebook battery lasted this long?

Mine goes up and down, changing with nearly each update, and has bounced between 102.xx% and 94.xx% over the past (almost) two years. Currently it reports 100.29%. Grains of salt should be assumed.

79% on my refurbished Acer Chromebook 14 after almost a year.

On my ancient (by Chromebook standards) Lenovo 11e it's 84.01%. On my fairly new C302CA it's 87.75% which isn't great considering it's only a month old. On my HP Chromebook 13 G1, which is about 14 months old, it's 93.67%.

All three still have decent battery life.

I agree with 47prime, take any result with a pinch of salt.

If you take proper care of your battery, you should get years of use.

Users who discharge their batteries completely will see reduced health and eventual complete failure.

Is it better to keep it plugged in all the time?

Not entirely true. With lithium ion batteries, it is know that it is really the full cycle count. As long as the battery is kept cool while charging (which in the case of a chromebook it will) it is really how many times it is charged from zero to 100. IE if you charge twice from 0 to 50, that is the same as one zero to 100

Refurb Acer C740 (I've had it for close to 3 years personally): 87%

I'm wondering if this is all time based, because that is what mine is sitting around. I forgot exactly where in the internal diagnostics it is, but you can see the Wh that it registers your chromebook as and you can compare that to the known factory spec.

Year and a half old Acer R11 at 78.51%

Toshiba Chromebook 2 Original edition, 63% battery health. Have it 3 and a half years. I've used it a crap load though. Probably my best value purchase ever for tech. Battery has gone fairly bad though, lasts about 2 hours now.

99.63% on my pixelbook that I got on release.

This is my first time ever checking the battery on this chromebook. It reports having 81.14% and I've been using this Acer C720 since Nov 2013 every single day. Discharging from 100% to 1%, and fully charging it. Sometimes even letting it die by accident numerous times. I'm really surprised it has so much battery usage after so long!

Are you worried that your battery is starting to die and may need to be replaced? Are you looking for a used laptop and want to make sure that the battery is in reasonable condition before you buy? Laptops have ways to perform quick battery tests that can tell you a lot about the condition of the battery and even its history of use. We’ll break it down into separate guides for Windows laptops, MacBooks, and Chromebooks so you know exactly what you need to do.

Checking battery health on a Windows laptop

Step 1: Open Command Prompt

How to check your chromebook’s battery health

You will need to give Windows a specific command for this process. Start by typing in “command prompt” in your Windows search box, and select the Command Prompt result when it appears.

Step 2: Create a battery report

How to check your chromebook’s battery health

In Command Prompt, type (or paste) out the following command: powercfg /batteryreport. Now press Enter, and you should see a notification that a battery life report was created and saved to your user folder.

Step 3: Locate your battery report

How to check your chromebook’s battery health

The battery report now exists, but you have to access it. Fortunately, Windows will automatically name it “battery-report” so you can easily find the file by entering that into your Windows search bar and selecting the file that appears.

Step 4: Review your battery report

How to check your chromebook’s battery health

The battery report provides several different sections with information about your battery. You can see exactly what kind of battery you have, recent usage data, and a long log of usage history. You can use this information to look for anything suspicious or out of place about battery operation. The Battery Capacity History and the Battery Life Estimates are particularly useful to check if your battery performance has declined recently or gradually lessened throughout the life of your laptop.

On many Windows laptops, users have the option to replace their batteries if it looks like the current battery is performing very poorly. Here’s HP’s guide on how to do it, for example. Find the right battery model compatible with your laptop model if you want to go this route. Otherwise, you can always have a professional take care of it for you.

If replacing the battery entirely isn’t really an option right now, we also have a guide on extending battery life and generally making sure that your battery is cared for and as long-lasting as possible. Even basics like not letting your battery discharge too much (plug it in at around 20%) and keeping your laptop from high-temperature zones like by a heater or out in the sun can make a lot of difference.

Checking battery health on a MacBook

Are you working on a MacBook instead? You can also access a battery report here, although information will be a bit limited:

Step 1: Start by selecting the Apple icon in the upper-left corner of your MacBook’s screen, then choose System Preferences > Battery.

How to check your chromebook’s battery health

Step 2: Look to the left-side menu, and choose Battery again here. Now, look at the bottom of the window, and you should see an option to choose Battery Health.

How to check your chromebook’s battery health

Step 3: This will take you to a new screen with information about your battery. You can see the cycle count, which will give you a good idea about how long the battery has been used and if it may be showing age-related problems. Apple says its MacBook batteries can last up to 1,000 cycles, but batteries nearing that number will probably experience some issues. You can also see a broad Condition report that will show if the MacBook is detecting any serious problems.

Generally, current MacBook models are designed with batteries that are very difficult or outright impossible for the average user to replace or tinker with on their own. If you suspect battery problems, the best thing you can do is take your laptop into an Apple Store.

Checking battery health on a Chromebook

How to check your chromebook’s battery health

If you have a Chromebook, checking the battery is also possible with the correct command:

Step 1: Open the Crosh terminal. You can do this by pressing Ctrl + Al + T.

Step 2: Type the command battery_test.

Step 3: You will now be able to see your Battery Health followed by a percentage (the current estimated capacity of the battery). The Chromebook will also begin to run a battery test for several minutes to see how well the battery is discharging. The report should also give a cycle count that allows you to estimate how old the battery is.

You can check the battery cycle count on some Chromebooks by typing "battery_firmware info" into CROSH. My Pixelbook has 48 cycles, and the battery health is still at 102.77%. (I've already done full cycles to calibrate the meter.) More impressively, my old Acer CB3-111 is still at 97% battery health after 351 cycles.

You can access CROSH using the shortcut "control + alt + t". If the "battery_firmware info" command doesn't work, try "battery_test 0". It will give you less information, but it's still useful.

How have your Chromebooks held up?

How to check your chromebook’s battery health

2842 out of 3920 72.45% health 559 cycles. Not to bad from a 4 maybe 5 year old Chromebook.

82 cycles & 94.27% health on a Pixelbook bought January 5th.

Interesting. I started this thread to find out how long my Pixelbook would last, because I just got it on June 6th.

Has your battery health always been that low, or did it decrease over time? Mine started at 103.14%, so it's done pretty well so far, but that might be because I've always taken care to unplug it at 75%, before the voltage exceeds 8500mv (4.25v per cell).

This is like a "death clock" countdown. Not sure I want to check mine! 😂

94.9% capacity, looks like. 168 cycles in a year's worth of use.

crosh> battery_firmware info Cannot stat /run/lock. Trying fallback directory: /tmp Battery info: OEM name: SMP Model number: L17M3PB Chemistry : LIP Serial number: 0074 Design capacity: 3735 mAh Last full charge: 3829 mAh Design output voltage 11250 mV Cycle count 45 Present voltage 12189 mV Present current 266 mA Remaining capacity 3251 mAh Flags 0x06 BATT_PRESENT DISCHARGING

That's really cool! My Acer c720 from 2013 still has 86.11% capacity left. Pretty impressive if accurate.

Do you know what a "cycle" actually means?

The term "cycle" refers to a full charge and discharge. If you fully discharged a battery and then charged it back to 100%, that would be one cycle. Charging from 50% to 100% two times would also constitute one cycle.

The industry standard for lithium ion batteries is 70% capacity retention after 500 cycles, but it seems like Chromebooks generally last longer than that.

Man, I got mine a couple months ago (9 cycles) and it's at 87%. Definitely seems weaker than it should. Acer R11 for those wondering.

These are not very accurate

Acer R13 bought 05/12/2017 ( so just over 7 months old) – is that a surprisingly big drop off in battery health for only 99 cycles?

Battery health: 89.51%

10% is a lot of capacity loss after 99 cycles, but the battery health indicator isn't always accurate. "100%" refers to the official rated capacity, so it's possible that your Chromebook's actual battery capacity was well below 100% even when it was new. The battery health indicator is also more accurate after you fully charge and discharge your battery, so you could try doing that.

In a similar thread I started two months ago, one person replied, "After 9 months, my Acer R13 is at 96.36% of battery health." This makes it sound like your Chromebook just came with a bad battery, because he probably has as many cycles as you do by now.

So if the rated capacity (for example) is 4000mah and it ships brand new at 3600mah (90% capacity), will calibration help either reset the battery to show 3600mah or update the rated capacity to show 3600mah?

The rated capacity (4000mah) is determined by the manufacturer, and it never changes.

Calibration is necessary because the 3600mah estimate may not be accurate.

Battery meters don't really know how much charge is remaining in a battery. They estimate it by measuring the voltage, which increases as the battery is charged, and by measuring the amount of current that flows in and out of the battery.

This provides a useful estimate of the charge remaining, but it won't work forever. If you keep charging and discharging a battery without ever reaching 100% or 0%, the meter will forget what "full" and "empty" are. It measures the current flowing in and out, but it can only guess the amount left inside the battery by measuring the voltage. That's why it's not uncommon for a computer to die with 5% charge, especially if the battery's capacity has decreased since you last drained it.

Fully cycling a battery allows the meter to measure exactly how much current it takes to fill the battery back up, instead of trying to guess the capacity by finding the change in voltage when a small amount of current is put in. That is why your battery health estimate might change dramatically if you let your computer die.

Here is a quick tip from François Beaufort to test the battery health of your Chromebook. All you have to do is enter the Chrome OS command line using Ctrl + Alt + T and enter the following command:

That will run a (very) short test and tell you how good your battery is now.

My Samsung Chromebook Series 5 550 shows 69% and I found at least one more 5 550 user with similar results on Google Plus. Pixel users seem to get around 90 – 95, and there are people reporting CR48 still holding up at 100%. Test your battery health now and let me know in comments!

How to check your chromebook’s battery health

A quick note on Batter Health from Wikipedia:

State of health (SOH) is a figure of merit of the condition of a battery (or a cell, or a battery pack), compared to its ideal conditions. The units of SOH are percent points (100% = the battery’s conditions match the battery’s specifications).

Typically, a battery’s SOH will be 100% at the time of manufacture and will decrease over time and use. However, a battery’s performance at the time of manufacture may not meet its specifications, in which case its initial SOH will be less than 100%.

So, what’s your number?

About Dinsan Francis

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