Economical and compact, the Energizer Base Charger is simple to use and ideal for homes that use small numbers of rechargeable batteries. The unit is able to charge both AA and AAA size batteries and can take up to four batteries at a time, of the same size; the recharge cycle takes approximately eight hours to complete. The charger has a green LED light that will light up when the batteries are fully charged, ensuring that no energy is wasted from leaving it on for too long. It operates from the mains power supply and is small enough to pop in the kitchen drawer, ready for when it is needed. This unit also comes with four pre-charged 1300mAh AA rechargeable batteries to get you started. Always ensure that only rechargeable batteries from a trusted manufacturer are used with .