Yes, it also fits the Nikon D3100 and replaces the standard EN-EL14 battery. For optimal use, check that your camera has the latest firmware version A:Ver.1.02/B:Ver.1.01.
Otherwise, the latest firmware is available in the link below (please follow the instructions carefully) and read the paragraph "Changes from this version" for more information:
http://downloadcenter.nikonimglib.com/de...
