Sony Cybershot DSC-W55

Hi!
My battery died and the person who replaced my camera replaced it with the wrong charger. So my camera sat for the last two months. I purchased the correct charger which states the battery is now fully charged when I place it in my camera it still wont power up. Oddly (to me) if I use the USB and plug it into my laptop after a few days I can get enough juice to the battery to take one or two pics. I read on line to hold the power down button for a few seconds, which I did and it amazingly turned on long enough to tell me my battery was low. So I ran to recharge it, and now nothing! Any Suggestions