ActionHeat 3.7V 2200mAh Rechargeable Battery Kit for Socks Rechargeable Lithium Ion (Li-ion) 18650 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com
Lithium Ion Battery Pack - 3.7V 6600mAh : ID 353 : $24.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: Blomiky 2 Pack 3.7V 600mAh Lithium Rechargeable Battery and 2 USB Charger Cable Compatible with Fisca Remote Control Robot Dog K9 Battery 2 : Toys & Games
Li-Ion Charger (Single Slot) + 2 x 18650 3.6V Li-Ion Button Top Batteries (
GTF 4pcs 100% Original Ncr18650 Li-ion Rechargeable Battery real capacity 2200Mah 3.7V For Panasonic E + 1pc battery charger - AliExpress
LI-ION 11.1V 2200MAH (2C) WITH INBUILT CHARGER-PROTECTION