My laptop battery shows 0% charge when logged in to ubuntu and switches off within 5secs of removing the ac power.

However, if I run try ubuntu from a USB drive, I get full battery and it works normally without ac power for a couple hours. So seems like my battery hardware is alright and fully charged, but the software is reporting it to be always 0% for some reason and hence it switches off when ac power is removed.

Can I fix this somehow? Perhaps configure it to not switch off when battery is 0%?

Also, this a new battery.

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