With 3.7V of power and a 1700 mAh capacity, this DigiPower RF-NKL23 lithium-ion battery delivers reliable power to your compatible Nikon digital camera, so you can enjoy lasting use.
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It was charged ready to be swapped out. An external charger would be nice when a lot of photos are going to be taken especially when you do a lot of zooming. 2 batteries were enough because I staid on top charging.