I need a new battery or charger for toshiba laptop A105-S2101. The battery is a PA3451U-1BRS and its a DC 14.4v 2000mah. Well first off the battery wont hold or take a charge. Everytime I unplug it from the wall the laptop goes off too. The lights do come on the laptop showing that its charging. 2nd thing is does voltage matter on battery replacement? I cant find 14.4 replacement thats cheap. All ones I find 10.? volt with 4000-4400mah on ebay.