3S 18650 battery case for DJI FPV goggles by TunnelVision

Last crawled date: 3 years, 3 months ago

Description
3S 18650 battery case for DJI FPV goggles with XT30 and balance charging connectors, plus battery voltage indicator. It uses contact clips to avoid soldering directly to the batteries for less death potential.
The case might be suitable for other applications but given that I measured a current of something like 0.7A (i.e. relatively low) at around 12V when powering the goggles, it's not designed for higher current loads and that would necessitate heavier gauge wiring.
Somewhat inspired by https://github.com/skaman82/PowerPuck.
Parts
3S battery voltage indicator: https://www.aliexpress.com/item/32848288120.html
M2.5 threaded inserts: https://www.ebay.co.uk/itm/262993790868
M2.5x20mm countersunk socket screws: https://www.ebay.co.uk/itm/321229110150
Keystone 228/209 battery contact clips: https://www.modmaker.co.uk/Keystone-228-Battery-Contact-Clips-x-4; https://www.modmaker.co.uk/Keystone-209-Battery-Contact-Clips-x-4
Balance charging leads/connectors: https://www.ebay.co.uk/itm/331234433262; https://www.ebay.co.uk/itm/230782468199
XT30 connectors: https://www.ebay.co.uk/itm/191803288686
Notes
I'm not completely happy with the push-button for the charge indicator; epoxying it in place jammed up the switch (perhaps unsurprisingly). Hopefully I'll come up with something better.