KP-853562 3.7v 1800mAh Rechargeable Battery for Drone, Toys, DIY, Robotics(with USB Charger)
PATOYS | 3.7V 850mAh Li-Po Rechargeable Drone Battery High Capacity for RC Toys, Helicopters and Drone - Extended Flight Time and for DIY Projects | PATOYS
DJI FPV 6S BATTERY - DIY Compatible | Hackaday.io
How to Make Your Own Quadcopter Battery : 11 Steps (with Pictures) - Instructables
How to wire a DIY 18650 batterypack (primarly for drone lipo field charging through an ISDT charger)? : r/batteries
DIY - build a "LongRange" Lithium Ion Battery
Using Li-ion Battery Packs for Long Range FPV Drone Flying: Pros, Cons, and Recommendations - Oscar Liang