The Ansmann Max e Power Set Battery Charger and Batteries is a compact and portable overnight battery charger and AA battery set. The charger can accommodate either two or four NiMH or NiCd AA or AAA cells at a time, and an LED indicator light displays charging status. Reverse polarity protection ensures safe charging and, depending on the batteries in use, the charger takes between 3.5 to 14 hours to fully charge a set of batteries. In addition to the charger, four Max e 2500mAh NiMH AA batteries are included for use. These batteries are low self-discharge and will retain their charge for up to one year.