The Tornado 2/3 AF 1600mAh 4.8V config 9 NiMH battery is part of Overlander's Premium Sport range. These rechargeable Nickel-Metal Hydride batteries have amazing power in a neat and compact size. They have twice the discharge rate of AA batteries, meaning great power and high drain. The sizing of these 2/3 AF cells make them a perfect go-to for applications with limited space. It really is surprising how much energy is compressed into these batteries.