2700 mAh Nickel Metal Hydride 'AA' batteries. If you don't know what NiMH is, you are behind the times. NiMH technology provides all the benefits of NiCads without the toxic ingredients and without the memory effect problem! 2700 mAh is a huge cell perfect for handheld, RF, and digital camera applications. We use these in everything! 26 grams per cell. Also see our 4 Cell Battery Holder and Battery Charger.