I've been repairing desktop pc's for over twenty years and a few laptops along the way. I don't understand how cmos batteries could keep the main battery from recharging. This laptop was given to me in exchange for a good desktop, I know that is was never dropped. It was left plugged in to the AC for about five months without being turned on. So a trickle charge to the main battery. Maybe I'm back to the power jack again or the internal voltage regulator. I do wnat to thank you for the comment.