Duracell Rechargeable AA Pre-Charged batteries let you charge hundreds of times, helping you save hundreds of dollars, and are 50% longer-lasting per charge.* With a Long-Life Ion Core, you get more power in every battery. They come pre-charged and will hold their charge longer than ever before.** Plus, they are guaranteed to last for 5 years and, with Duralock Power Preserve Technology, they’ll hold a charge for up to 1 year when not in use. These powerful NiMH batteries work in any NiMH charger, and you can recharge them up to 400 times. With a longer-lasting charge and fewer recharges, Duracell Rechargeable AA Pre-Charged batteries really do set themselves apart from the rest. *Per charge vs. AA 1400mAh within the first 250 cycles.**Vs. 2000mAh cells in the same device. Come pre-charged and work in any NiMH charger Long-Life Ion Core makes them 50% longer-lasting* per charge (*Per charge vs. AA 1400mAh within the first 250 cycles.) Duralock Power Preserve Technology holds a charge up to 1 year in storage and guaranteed to last 5 years; Recharge up to 400x to help save money Ideal for game controllers, baby monitors, baby swings, wireless electronics and more