I buy 3rd party replacement batteries on Amazon. The original batteries have degraded by now, and replacing the cells is a tricky operation: https://hackaday.io

I buy 3rd party replacement batteries on Amazon. The original batteries have degraded by now, and replacing the cells is a tricky operation: https://hackaday.io/page/247-replacing-lenovo-laptop-lithium-batteries https://hackaday.io/page/247-replacing-lenovo-laptop-lithium...