Envelop Ni-MH "Low Self Discharge" batteries utilize advanced rechargeable battery technology allowing them to be recharged up to 1500 times. They deliver excellent power performance. They come pre-charged and can be used immediately out of the package. These envelop cells also have increased storage life and better extreme temperature performance than the original envelops. Envelop 1500 recycle rechargeable batteries maintain up to 75% of their charge after 3 years of storage. Keep your tactical flashlights, walkie-talkie radios, battery powered lanterns and other devices powered in the winter. Envelop 1500 recycle and XX batteries deliver exceptional performance at extreme low temperatures, down to -4 degrees Fahrenheit. Envelope's "Clean Energy Loop" initiative has become a reality. All envelop 1500 recycle and XX batteries are charged at the factory in Japan using power generated from solar energy. The purchase and use of a single envelop battery cell can keep many hundreds of batteries from entering landfills! Save money and Save the Earth with the purchase of the premiere rechargeable battery, envelop 1500 cycle!!!