Amazon.com : Nikon Coolpix S3100 Digital Camera Battery Lithium-Ion (1000 mAh 3.7V) - Replacement for Nikon EN-EL19 Battery : Digital Camera Battery Chargers : Electronics
Amazon.com: USB PC Data+Battery Charger Cable Cord Lead for Nikon Coolpix S3100 S4150 Camera : Electronics
BM Premium EN-EL14A Battery for Nikon D3100, D3200, D3300, D3400, D350 – Big Mike's Electronics
Nikon Coolpix S3100 Camera Battery Replacement - iFixit Repair Guide
2x Pack - Nikon Coolpix S3100 Battery + Charger with Car & EU Adapters - Replacement for Nikon EN-EL19 Digital Camera Battery and Charger (700mAh, 3.7V, Lithium-Ion) - Walmart.com