I have a Panasonic cordless drill but no charger. It has a 14.4 li-ion battery. I have a charger from one of my cordless drills that is 12v li-ion. Is there any reason I couldn't simply run two leads from the positive and negative terminals of the 12v charger to the positive and negative terminals on the 14.4v battery to charge it? Both sets of terminals are easy to get at without taking anything apart.
Thanks