Laptop immediately turns off after disconnecting AC adpter

Uri1234

Estimable
Nov 27, 2015
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4,510
Hi

I have the Toshiba P75-A7200 laptop.
Whenever I disconnect the power plug the laptop turns off..

I've ordered a new battery, installed it and let it charge for 12 hours-same problem. (the battery percentage is stuck in 82% forever).

Please advise.