Netbook does not "see" battery (two different batteries)
My older Aspire ONE does not see either battery (three cell or 6-cell) that is installed. It is hard for me to think that both batteries would go bad at the same time, therefore I feel that it might be the computer. If I knew the battery pin-outs I could at least use a multimeter and check the voltages. The netbook is not used very often, and sits dormant for weeks at a time.
I do not want to buy a third battery if the problem is in the computer.
How do I check, correct this problem?
Using POP!_OS 20.04, which is basically Ubuntu 20.04 with some help from System76.
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