ok heres the deal i recieved a 4 piece kit 1 year ago as a gift and did'nt know i need to register for the lifetime warranty. Just recently i found out one of my batteries is completely dead and wont hold a charge and i think the other one is about to go bad. but the charger that is supposed to tell me if a battery is defective does'nt. any advice? cause i am absolutely not buying new batteries not a $160 a pop.