Just to expand on the reply you were given. RCKEN was correct but another consideration should also be taken into account. That is the capacity of the battery. To properly fully charge a battery they should be charged at 1C. That means if it's a 1500 MA battery pack it should be charged at 1.5 Ma. for 14 hrs., if it has been run down. For further more complete info on batteries and chargers check the bat./ chargers site.