C730 Chromebook Battery No Longer Charging

I've got about 20 C720 Chromebooks and a handful stopped charging over the summer. The battery indicator light is orange. The battery meter in the menu gets up to between 1 and 50% depending on the chromebook, then the "h:mm until full" timer gets higher and higher and eventually the text disappears altogether.
On a few, the issue was resolved when I updated Chrome OS.
On the others, I've tried:

Updating Chrome OS
Performing a hard reset using the refresh and power buttons
holding down the Esc-Refresh-Power until the ! screen shows up, then pressing Refresh-Power
Using known-good Power adapters
Reseating the battery
Putting the chromebook in pre-charge mode by unplugging it while holding Refresh-Power
Powerwash

battery_test shows battery health above 90%
These machines are about 20 months old. Does anyone have any ideas?

Accepted answers

JustinT

For anyone who stumbles on this old post, I fixed these Chromebooks by following the procedure at https://chromeunboxed.com/news/acer-chromebook-r11-batter-not-charging

The short version is to unplug, power down, boot into recovery mode, plug the Chromebook in, wait 6 hours, then reboot.

All comments

Sharanji

JustinT
This is not an hardware issue, A recent Chrome OS software update is causing some Chromebook models to incorrectly display the battery charge status. The battery should be still functioning at full capacity, and usage time should not be impacted.
Check this updated (03/19/2018) link and see whether it helps : https://us.answers.acer.com/app/answers/detail/a_id/51932

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JustinT

Thanks for the reply Sharanji. That was probably the issue for the ones that updating Chrome OS resolved. I have a number of machines still having the issue after updating. On these, usage time is impacted.

Sharanji

JustinT said:

Thanks for the reply Sharanji. That was probably the issue for the ones that updating Chrome OS resolved. I have a number of machines still having the issue after updating. On these, usage time is impacted.

JustinT
If you have large number of Chromebooks affected with same issue, you can also send a private message to Acer-Manny with the serial / SNID number of your device so that the concerned team can check and help you address your concerns. https://community.acer.com/en/messages/add/Acer-Manny

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Click on 'Yes' if the comment answers your question!

JustinT

For anyone who stumbles on this old post, I fixed these Chromebooks by following the procedure at https://chromeunboxed.com/news/acer-chromebook-r11-batter-not-charging

The short version is to unplug, power down, boot into recovery mode, plug the Chromebook in, wait 6 hours, then reboot.