Sanyo Eneloop AA Rechargeable NiMH Batteries combine the advantages of disposable batteries along with the advantages of rechargeable batteries. Because the batteries have a low self discharge the batteries are shipped charged, and ready to use. The low self-discharge design allows you to store the Eneloop batteries for months and they will still provide almost full capacity and performance. Even after being stored for 1 year, the battery holds 85% of its charge. When charging the batteries there isn't any memory effect, so you get a full charge every time. Also the batteries have a life cycle of around a 1000 charges.
One of the main features of Eneloop batteries is that they operate at higher voltage levels than other similar batteries. Many applications switch off or show the low battery signal if the voltage is lower than 1.1V. A traditional NiMh battery will lose its voltage at this critical level. Eneloop batteries, however, will keep the voltage level over 1.1V for a long time. That is why Eneloop batteries last longer than a standard 2700 mAh battery.