The Nikon EN-EL14a is a rechargeable Lithium-ion battery pack designed for specific Nikon DSLR cameras and Coolpix models. It features a capacity of 1230mAh and can be charged over 1000 times. This battery is compatible with Nikon D3100, D3200, D3300, D3400, D3500, D5100, D5200, D5300, D5500, D5600, and the Nikon Df. It is also compatible with the Coolpix P7000 series, including the P7700 and P7800. The battery is memory-free, ensuring optimal performance.