This is a 4-pack of 1.2V Long Life ion Core AAA NiMH Batteries from Duracell. Each has a capacity of 800mAh. With Long Life ion Core technology, the batteries are designed to last for hundreds of uses in high-drain devices. They come pre-charged and are capable of being recharged up to 400 times. Additionally, they feature Power Preserve Technology, which holds a charge for up to 1 year in storage.