1.Alkaline rechargeable battery is more kindly to the enviroment, and the most importment thing is that it is more paying than any other rechargeable battery. 2.description:open circuit: 1.5V internal ohmic resistance of fresh cells: AAA,0.07V,AA 0.06V capacity: AAA,1100MAH,AA,2300MAH dimensions:AAA,44.2*10MM,AA 49.9*14MM weight:AA,10G,AA21G operating temperature: -20c-60c recommended operating temperature: 15-40c shelf life cells: up to 5years cycle life: up to 60times 3.packing: 2pcs alkaline recharage batteries with one charger of two slots ,or 4pcs alkaline recharage batteries with one charger of 4slots