Amazon.com : Synergy Digital Camera Battery, Works with Nikon Coolpix 5700 Digital Camera, (li-ion, 7.4V, 850 mAh) Ultra Hi-Capacity, Compatible with Nikon EN-EL1 Battery : Electronics
Nikon Mb-e5700 Battery Grip Pack for Coolpix 5700 8700 for sale online | eBay