Polymer Li-Ion Module: 3.7 V 5000mAh ( 18.5Wh, 7A rate) - Prewired with PCB
Amazon.com: HXJNLDC DC 3.7V 5000mAh 955565 li-ion Lithium Ion Polymer Battery Replacement for DIY 3.7-5V Electronic Product, Mobile Energy Storage Power Supply : Electronics
GTF 3.7V 26650 5000mAh Li ion Rechargeable Battery 26650A High Real Capacity 5000mAh Batteries for LED flashlight Electric toys|Rechargeable Batteries| - AliExpress
26700/26650 Li-ion 3C 5000mAh Rechargeable Battery - Original EV Grade – QuartzComponents
Amazon.com: 3.7V 5000mAh 2 Cell Lithium ion 18650 18.5Wh Rechange Battery Pack with 2 Pin MTA-100 Connectors : Health & Household