AA-size battery, XX powered by eneloop technology, the highest capacity eneloop boasting Typ. 2500 mAh(see *1) of power. Utilizing proprietary eneloop technology, the XX powered by eneloop is ready to use right out of the package and retains up to 75% of its charge after one year of storage(see *2). The XX powered by eneloop package of four-AA batteries will be available next month at an MSRP of $24.99. Amazon will be featuring the item for pre-sale starting on June 30.