Product Details
EN-EL4a is a compact Lithium-ion power supply for Nikon D2 series D-SLR cameras.
Up to 3800 images can be shot on one charge. The EN-EL4a is free from 'memory
effect', so it can be recharged at any time or any level. A microchip built into
the battery measures discharge capacity and compares it to the full (maximum)
capacity recorded when the battery was last calibrated.