CTA Digital DB27AA Aa Nimh Rechargeable Batteries CCTA DIGITAL DB27AA AA Nimh Rechargeable Bateries. These 4 pack ultra high capacity 2400 mAh NIMH rechargeable batteries from CTA are especially designed to work with all high drain devices such as Digital Cameras, CD Players, Remote Control Vehicles, Metal Detectors, Flashlights, PDAs and all other devices that accept AA batteries. These NiMH rechargeables have a capacity of 2400 mAh, 80 percent more capacity than most rechargeables. The extended capacity of these batteries mean that you are getting longer lasting power and that means more pictures or more playback. Plus, you can recharge these batteries up to 1000 cycles. NiMH batteries do not suffer from the memory effect of NiCad batteries, so you can partially charge them without reducing their capacity. You can also save money, since you no longer have to buy new batteries every time your alkalines run down. If you already have one of the CTA battery chargers this pack is a good addition, while you are using one set of batteries, you can have four more charging and ready to go.