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
Battery Pack For Nikon Coolpix S3100, S3200, S3300, S3400, S3500, S3600, S3700, S4100, S4150, S4200, S4300, S4400 Digital Camera - Digital Batteries - AliExpress
Europebattery.com - BATTERIA PER NIKON COOLPIX S3100 EN-EL19
NIKON COOLPIX S3100 14MP COMPACT DIGITAL CAMERA W/BTTERY, CHARGER, CASE, CORDS | eBay