eneloop is a combination of a rechargeable and a disposable battery the next evolutionary step for batteries into the 21st century. SANYO can ship the batteries to Amazon in an already charged state, without losing its power, because of it very low self-discharge. This means that you are purchasing an already charged battery.
eneloop is as user-friendly as a disposable battery. Once charged, it keeps its charge for up to 6 to 12 months - (90 per cent of the charge after 6 months, 85 per cent after 12 months)