Amazon.com: Synergy Digital Camera Battery, Works with Nikon Coolpix 5400 Digital Camera, (li-ion, 7.4V, 850 mAh) Ultra Hi-Capacity, Compatible with Nikon EN-EL1 Battery : Electronics
2x Battery EN-EL1 ENEL1 for Nikon Coolpix 4800, 5000, 5400, 5700, 8700. - compare list of compatibility!: Amazon.co.uk: Electronics & Photo
EN-EL1 Battery for Nikon Coolpix 5400
Best Buy: Denaq Camera Battery for Nikon CoolPix 4300, 4500, 5000, 5400, 5700, 8700, 995 DQ-RL1