I bought an old netbook. Windows 8 was installed on the netbook. The battery charge was a maximum of 39%. Working time was 1.5-2 hours. I reinstalled xubuntu 18.04 and it was 17%. Working time 20 minutes. I did a complete discharge of the netbook in the bios and charged for about 3 hours. I did this cycle several times and only increased to 24%. The running time was 30 minutes. I unplugged the power and the netbook was dead in 15 minutes. After recharging and the charge became 9% and works for 5-7 minutes. How can I fix this?
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