Nikon has announced a recall of some EN-EL15 batteries. The camera models that use this type are: D800, D800E, D810A, D810, D610, D600, D7200, D7100, D7000, D500 cameras and the Nikon 1 V1. In order to find out whether your’s is affected by this, please check the 14-digit serial number on the underside of the battery. If digit 9 is an E or an F, it should not be used or charged and Nikon will exchange it. There are full details of the process involved in doing this on Nikon USA.
There is also an online serial number checker available if required.