Okay, so today I got my new Samsung Instinct and i bought a new battery, and a new charger. I charged it and it said " Fully Charged" after about 5 mins. then i unplugged it and it went down 1 bar... then it lost charge in like 5 mins, and died. It's not brand new, I bought it on Ebay... but everything else works... so I dont want to return it... please help?