The Ni-MH battery rechargeable up to 1,500 times with the positive temperature coefficient (PTC) function. Designed to promote the replacement of dry cell batteries thrown-away after use, eneloop plus aims for the sustainable society by enlarging "the lifestyle of using over-and-over". It can keep approxitavely 75% of energy after three-year-storage. Mounting PTC thermistor of polymer series inside, families with small children can safely use this battery. All batteries are charged with solar energy before shipment, packaged with the single material of recycled PET.