Batteries can discharge only, 2 times batteries can fill discharge to be used circularly repeatedly, can charge batteries produces reversible change between bulk of the electrode when discharge and structure, because of when this is designed, must adjusting these change, and batteries interior is gotten simply much, because it does not need to adjust,these reversibility change, the quantity all is more than the quantity of quality specific volume of batteries and bulk specific volume to charge commonly batteries, but internal resistance is far bigger than 2 batteries, because this is laden ability is inferior, additional, of batteries discharge oneself far be less than batteries 2 times. toshiba pa3383u-1brs , toshiba pa3384u-1brs , toshiba pa3285u-1brs .