I have a new battery for my dell 5150 laptop. It worked for 1 hour then died. I didn't realize that u needed to charge it for 12 hours before usin it the 1st time. Imm chargin it now but I don't see a green light on the keyboatd that usually shows when the battery is charged. Should I worry? Or is it just that it needs time to charge like it said for 12 hours? Email me at [email protected] with your answer. Thanks