Terminals: Flat Top (no raised button)Voltage: 1.2vChemistry: NiMHHeight: 0.2165 in.Width: 0.4567 in.Amperage: 40mAhThese Nickel Metal Hydride Button cells are excellent for building custom battery packs. If you are a novice or an old pro, these batteries will keep you powered up. These batteries can be recharged 500-1000 times giving you years of use.Features• High quality Button (Coin) Cell size 1.2V, 40mAh rechargeable Nickel Metal Hydride (NiMH) battery• Make your own battery pack in any combination of shape and voltage with easy soldering• Very long cycle life and rapid battery charge up• Excellent quality and the best priceSpecificationsOutput Voltage: 1.2V, Amperage: 40mAh, Chemistry: NiMH, Height: 0.2165", Diameter: 0.4567"