This sounds strange, but here goes. I have a toshiba satellite 1955-s805 that is about 4 years old. I have just replaced the battery from Best Buy (probably refurbished). The problem is that the battery charges after a restart with the wall adaptor plugged in. It then reaches 100% charge, the battery charge light goes off and the battery begins to discharge. The battery then completely discharges and the laptop shuts off. And IT’S STILL PLUGGED IN TO THE OUTLET. I am at a loss here. This happened with the old battery too.