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This circuit board fits inside an Oura ring, worn on a finger to transmit health info (sensor readings) to a phone or tablet device over BLE (Blueteeth Low-Energy). It uses wireless battery charging and obviously needs to have a BMS onboard to manage the cell. The battery is said to be good for 6-7 days between charging.

So if this all can be done on such a small scale, then surely at least some features can be scaled up for diy EV applications.

 
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