DJI FPV goggles 3s 18650 battery

thingiverse

I designed this battery specifically for 3s 18650 cells, so users never have to worry about low voltage warnings around 7.5V like they do with standard 2s batteries from their Fatshark goggles. The battery fits easily into a trousers pocket, can be clipped onto your belt, or even attached to the rear of the goggles' headband. I added some intelligence to this design, including a BMS board placed at the bottom of the box. This is available on eBay, for example https://www.ebay.com/itm/BMS-Li-ion-Balance-Board-18650-3S-4S-5S-25A-Lithium-Battery-Protection-Circuit/164189323365. I also included a charge state indicator. You can find this type of display on eBay, for example https://www.ebay.com/itm/3S-Battery-Display-Li-ion-18650-Battery-Display-Charge-State/114258711455. In addition, I added a pushbutton that lets users display the charge state when pressed. This is also available on eBay, for example https://www.ebay.com/itm/10-Piece-Miniature-Switch-Red-OFF-On-Tactile-Button-Stainless-Housing/330892398070. The batteries used in this design are high-quality Sony / Murata Konion VTC6 type cells with welded contact stripes in a Z configuration for easy soldering. I added a cable relief using a piece of silicone tube to make the battery easier to handle and more comfortable to carry. The clip is a separate part that makes it easier to print the lid without needing supports. It's also optional, so users can choose not to use it if they don't need it. The clip has been glued with CA to the lid. To attach the lid to the box, use 4 x M2x5 screws.