I need help with a used laptop I recently bought. It is a Thinkpad A21p on which the hard drive had been completely wiped clean. I was not able to keep the power on for more than 5 minutes whether I used the power cord and battery or the power cord without the battery. However, since the battery was charged when I got it, I was able to install the operating system and lots of software just on the battery alone. Once the battery lost all its charge I have never been able to get the laptop to stay on more than 5 minutes.
I have tried different power cords and I have bought a docking station and nothing makes a difference. Any suggestions?