hi can anyone help iv got a advent 7109b laptop. that i baught a new battery for. the origanal battery is a l51-4s2000-g1l1. this battery charges fine. but does not last long. the new battery i baught is a l51-4s2200-g1b1. this battery only comes on charge for 1 min then switches off. i now have 2 of these batterys and they are both the same they will not charge. iv been told i need a bios upgrade. but cant find one for my model. the techguys at pc world say i should not need one as if my other battery charges so should this as they are both l51 batterys. pulling my hair out now. cheers brian
