UltraCell Plus NiZn 1.6v AA - 2800mWh High Voltage Rechargeable Batteries With Battery Storage Box (Combo for 4pcs AA + 1pcs Yellow Battery Box) High Voltage 1.6v AA improving performance for any high drain devices especially Digital Cameras Environmentally Green - Both nickel and zinc are non-toxic and recycled easily and inexpensively High Energy Density - The Ultracell+ battery has up to a 33% more the energy density over standard (NiMH/NiCd) rechargeable batteries Volt: 1.6V Capacity: AA - 2800mWh NOTE* : These batteries cannot be recharged by a standard NiMh charger. Please use a Nickel Zinc (NiZn) charger.