Question HP Elitebook 840 G3 battery not detected

Aug 16, 2021
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Laptop and battery were working fine. I am actually a PC Engineer and swapped my battery out to test a clients 840 G3.
Long story short, after putting my battery back in my laptop it is no longer detected by Windows 10 and it does not charge.
Strange points...
*At first laptop still ran on battery even though it was not detected, until it ran out of power. I switched to mains power and several hours later tried battery again. It had charged, but still not seen.

*Had been on mains power for several days and plug came out of laptop and it died instantly, so battery not charging anymore.

*HP Support and tools reports no battery.

*Kali Linux (dual boot) does see the battery. Reports 0% charge.

Have tried another battery that I know works from a G3 and it has same result. My battery works fine if put into another G3.
Have deleted battery drivers etc, done full power drain and things but nothing seems to work.

Anyone have any idea what has happened? Rather annoying having a laptop that does not work on battery any more.

Thanks.
 
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