3.0V rechargeable CR123A battery (1)Cyta Rechargeable CR123A Li-Ion Batteries with 3.0V working voltage and 900mAh capacity. (2)Cytac RCR123A can be recharged up to 1000 times. One piece RCR123A Li-Ion = 500 pcs Primary CR123A cells. (3)Peak voltage of 3.0V Li-Ion will be 3.9 V after fully charged. Once loaded, cell's voltage will drop to 3.6 - 3.2V (4)It is perfect for most camera, and compact flash light with bulb voltage > = 4.5V ( Not good for light bulb < 4.5V ) (5)Cell's dimension: 16 Dia. x 32 H mm. (6)Weight: 17 g or 0.6 Oz. in bulk