CB3-431-C5FM: AP13J3K and AP13J4K battery troubles

grjer
grjer Member Posts: 3 New User
edited November 2023 in 2019 Archives
Primary question:  Do I just have bad luck with batteries, or is my motherboard failing?

My refurbished CB3-431-C5FM came with an AP13J4K battery that only had 3 hours of life.  Reported battery health was high for the two hours, then rapidly dropped toward 0%.  Replaced it with an AP13J3K (vendors claim the 11.25v AP13J3K is appropriate to replace the 11.40v AP13J4K), this gave about 8 hours of useful life but battery health declined more or less linearly from 100% to 45%, at which point the battery was depleted and the CB3 just died with no warning.  Needless to say, I depleted the AP13J3K a good number of times, and now it's stuck reporting 1% and won't charge, dies immediately when unplugged.  Tried a hard reset, disconnecting battery, letting it sit charging for a day, etc.  So now back on my AP13J4K with 3 hours of life.
Poking around the net, I see lots of differing advice:
  Either battery should work, at least on a C720P:  https://community.acer.com/en/discussion/448684/c720p-battery-replacement
  Acer recommends a rather long winded new battery calibration procedure:  https://us.answers.acer.com/app/answers/detail/a_id/27667
  This guy recommends powering up without a battery first:  https://forums.hak5.org/topic/37227-chromebook-not-charging-stuck-at-1-heres-the-fix/
  Try a hard reset if doesn't charge, full discharges can brick the battery:  https://support.google.com/chromebook/thread/583023?hl=en
  It's a common problem across chromebooks:  https://www.reddit.com/r/chromeos/comments/a4cdm5/help_battery_wont_charge/

I have one more month to return this beast, I like it except for the battery issue.
I suppose I could send the chromebook back and get a new one, not so sure I want to take potluck on another refurbished one.
Is this just a battery issue, or is this possibly a problem with the charging circuit on the motherboard?
Is there an issue with using an AP13J3K battery on this CB3-431-C5FM, perhaps due to the 11.25v vs 11.40v nominal voltage?
Is there any way to un-brick my AP13J3K battery so it will take a charge, perhaps forcing 100ma into a couple of the wires on it for a couple hours?
Do some of the batteries available from after-market manufacturers simply not work properly?
Shouldn't a decent design prevent the laptop from damaging the battery with a full discharge?

I've replaced many laptop batteries, have never had this much trouble.

Curiously, under Crouton, the system reports that the AP13J3K battery is cycling between charging and discharging about once per second.

The AP13J3K battery I bought was this, no longer offered by Amazon for some reason, perhaps a bad clone?:
ZTHY AP13J3K AP13J4K Laptop Battery Replacement for Acer Chromebook 11.6" C720 C720P C740 C720-2848 14 CB3-431 CB3-431-C5EX Series Notebook 3ICP5/65/8  Sold by: ZTHY TECH


Answers

  • JackE
    JackE ACE Posts: 44,904 Trailblazer
    >>>So now back on my AP13J4K with 3 hours of life.>>>

    If the old one still works OK except for the 3-hr life, I'd have to guess the new battery was junk. Sanyo Part #KT.00303.014 & Sony part #KT.00304.001

    Jack E/NJ




    Jack E/NJ