18650 USB Rechargeable 7.4V battery pack
thingiverse
A 7.4-volt battery pack pairs seamlessly with my FPV glasses, but its versatility also makes it suitable for other applications that require 7.4 volts. The pack can be charged via USB, and an LED voltage indicator provides a convenient way to check the battery's voltage. With 3500mAh of capacity, these packs offer nearly double the storage of Fatshark's alternative USB battery. Work in progress is underway! Please note: Some level of electronic expertise is necessary, and soldering directly onto 18650 cells can be hazardous.
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