Owners of some of Nikon’s entry and mid-range DSLRs are reporting that a recent firmware update broke support for their third-party batteries. The firmware update for the Nikon D3200, D3100, D5100, D5200 and CoolPix P7700 cameras claimed to report remaining charge more accurately for the EN-EL14a lithium-ion battery. However, on installing the update, some owners found their third-party batteries suddenly incompatible.
News: Digital Photography Review (dpreview.com)