The Panasonic AAA Rechargeable batteries are ready to use straight from the pack, you can rest assured that your appliances will stay charged for a long time. Suitable for devices that need long term reliability such as digital cameras and remote controls. This pack contains 4 batteries. They have a capacity of 750mAH and use Ni-MH chemistry, with a voltage of 1.2V. They are a standard size, making them easy to use in a variety of devices.