I had a laptop from work and it was showing plugged in, not charging. The problem was that, although the charger was a Lenovo charger, it wasn’t the correct wattage. Therefore, it was not powerful enough to charge the battery.
It would run the laptop, but would not do any charging. Replacing the battery did help increase the run time of the machine, but without the correct charger, no battery charging was done.
Maybe check to see the charger is correct to ensure you’re not buying a battery prematurely. Just my $0.02
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