Sounds like a bad battery, get a new one here, however if it turns on when connected to AC power there's a chance it could be the logic board instead, however that's a difficult and expensive repair, so try a new battery first.
We have a chance to guarantee our right to repair electronic
equipment—like smartphones, computers, and even farm equipment. This is a once-in-a-generation
chance to protect local repair jobs—the corner mom-and-pop repair shops that
keep getting squeezed out by manufacturers.
Join the cause and tell your state representative to support Right to Repair. Tell them you believe repair should be fair, affordable, and accessible. Stand up for your right to repair!