how long does it take to charge aa batteries?
AA batteries are charged by plugging the batteries on to the electric charger. The chemical ingredients of these batteries store the electric current, which we use later on for various purposes. Typically, it may take 3 to 4 hours to charge any type of AA battery; however, all these depend on your requirements. Charging Time for Different Types of AA Batteries. 1  Nickel-Metal Hydride (NiMH): Ultra Fast AA/AAA battery chargers take about 4 to 6 hours to simultaneously recharge four batteries.