Hi all. My friend passed his 510 onto me, and it came with 2 manual batts and all. My problem is that one of the batts will not charge at all. I've tried the wall charger and the pcc and both will not give any charge. The light flashes indicating a dead battery (i know that) but i'm still confused about how to get it to charge. Does anybody on here know how to go along fixing it? Also all of the contacts are clean on it, it's only been used for >1 month. Thanks!