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
BM Premium 2 EN-EL19 Batteries and Dual Bay Battery Charger for Nikon – Big Mike's Electronics
3pcs En-el19 En El19 Battery + Lcd Charger For Nikon Coolpix S32 S33 S100 S2500 S2750 S3100 S3200 S4200 S4400 S6400 S6500 S6600 - Digital Batteries - AliExpress
Nikon Coolpix S3100 Camera Battery Replacement - iFixit Repair Guide
Best Buy: Digipower Lithium-Ion Battery for Nikon Coolpix S3100 and S4100 Digital Cameras BP-NKL19