18650 USB Rechargeable 7.4V battery pack
thingiverse
A 7.4V battery pack used with my FPV glasses, this can however also be used with other applications needing 7.4V. The pack can be charged through USB and has an LED voltage indicator for easy checking of battery voltage. With 3500mAh, these are almost double the capacity of the Fatshark alternative USB battery. Work in progress! WARNING: Some electronic experience is needed, and soldering directly on 18650 Cells can be dangerous!
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