Size: D Rechargeable Capacity: 4000 mAh Chemistry: Nickel Metal Hydride (NiMH) Voltage: 1.2V Brand: Accupower Included Qty: 2 No memory effect Reliable service life Long-Lasting Performance Recharges up to 1000 Cycles Saves you hundreds of dollars compared to Alkaline batteries Can be replaced in any product that uses D Batteries Value-Added Battery Information If youâ€re new to rechargeable batteries jargon and usage, youâ€ll find some valuable pointers here to factor in to your purchasing decisions. The 2 most commonly used rechargeable battery chemistries today are: NiMH (Nickel Metal Hydride) and NiCD (Nickel Cadmium). The working voltage on both of these battery chemistries is 1.2 Volt (with the exception of the 9 Volt NiMH or NICd. Alkaline batteries (non-rechargeable) are a 1.5 Volts. The most common battery sizes are: AA, AAA, C, D and 9 Volt. Both NiMH and NiCD batteries will work in any consumer product that can use Alkaline batteries of the same size. Rechargeable batteries