GoPro Overkill External Battery Pack Up to 7 hours of recording — no charging, no expensive batteries. I designed this 3D printed extended battery pack using 21700 Li-ion cells and an IP5306 powerbank module to massively extend GoPro recording time. Two versions are included: 🔋 1-Cell Version (5000 mAh) – lighter, better for helmet setups 🔋 2-Cell Version (10000 mAh) – complete overkill, but perfect for long recordings Would you mount this on a helmet or somewhere else?