Lithium Ion Polymer Battery - 3.7v 500mAh : ID 1578 : $7.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Testing more 18650 Li-ion cells (REAL vs. FAKE) - YouTube
Lithium Ion Polymer Battery Ideal For Feathers - 3.7V 400mAh : ID 3898 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Arlo Certified: Tenergy 3.7V Arlo Battery Fast Charger and 650mAh RCR123A Li -ion Rechargeable Batteries for Arlo Wireless Security Cameras (VMC3030/3200/3330/3430/3530), UL UN Certified, 4-Pack - Walmart.com