Nikon updates battery recall: Overheating batteries from 2012 still causing problems: Digital Photography Review
Amazon.com : Nikon Battery and MH-70 Charging Kit for Coolpix 2100/2200/3100/3200/4100/4600/5600/7600 Digital Cameras : Camera Power Adapters : Camera & Photo
Third Party Camera Batteries
Solmeta N3 geotagging module for Nikon DSLR review: fast GPS locks, minimal battery drain | Engadget