My motorola battery needs replacing. I have bought a new battery but it will not charge.It is the correct model, a V3, and a new battery. I have tried two separate chargers and they charge the "old" battery but not the new one. I have also tried a compatible battery,i.e.not a MotorolaV3 , but no luck. The old battery needs recharging after just a couple of days, hence the need for a new one. Has anybody got any idea what the problem might be?