Welcome to Mint brenomacedo
This is a situation where you can't be sure what's doing what....
This is a rather old laptop so the battery has seen better days. Check with another battery if you can.
But it could be completely unrelated to the battery.....
256 MB is low....
Mint Linux and IBM ThinkPad 600x
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Before you post read how to get help. Topics in this forum are automatically closed 6 months after creation.