820-00840 dont see the battery

The issue is still there... long story short:
Was waiting for some parts for this machine to finish the repair, receive parts - put all back up, screw the back, plug the cable - no reaction

Plug the amp meter and see the power cycling behavior: 5v-19v for a second - ps shut down - 5v etc...

Open the machine, switch the logic board to the same machine and the board from the other one put in this one - both work and charge as expected 😟😟😟😵😵😵😵

Noticed that the board from another machine do no detect this battery serial number? May that be the reason? But why it work with another board?? And strangely enough it worked the last time??

I tough maybe it is related to how much the battery is charged, but with the other battery it work in full range...

Many thanks
 
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