Eneloop AA batteries are superior to the standard AA. With its incredibly high 2100 recharge cycles, one Eneloop is essentially equal to 2100 standard AA batteries. In addition, the Eneloop AA takes up to 4.4 times as many pictures as a conventional dry cell in a digital camera. It ships fully charged and performance well in temperatures down to -4°F. The D-cell spacers allow the AA batteries to be used in place of D batteries. The AA cells slide into the D spacers, allowing for easy use.