The Panasonic Eneloop Pro AAA NiMH 900mAh pack of 4 batteries are a high capacity battery. The same Eneloop technology is carried on by Panasonic, it comes pre-charged and ready to use out of the pack and is also Low Self Discharge. This means it can go longer between charges because of the slow release of it's energy yet it can still be charged up to 500 times making it extremely environmentally friendly. It will also still keep 85% of its capacity after 1 year of storage. Suitable for high drain devices such as wireless devices, remote control toys and digital cameras.