Case for Heltek V3

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* Fits Heltec V3 _with soldered pins_!

* Requires: 4x M2x10mm screws and 4x M2 brass heat-set inserts.

* Battery: Designed for a 21700 battery. For an 18650 battery, you must add a soft spacer (gasket).

* BMS Required: You must use a battery protection board (BMS). Heltec does not have deep discharge protection and will drain the battery below 2V, damaging it.

* Buttons: Use transparent plastic for the buttons so the LED light can shine through.

* Charging: The built-in Heltec charge current is only 150–200mA. The battery will charge very slowly.

* Power Consumption:

* ESP32-S3: ~120mA (idle) or ~30–50mA with optimized firmware.

* SX1262 (LoRa): ~5mA (idle/RX) and up to 140mA @ 22dBm during packet transmission (lasts less than a second).

* Future Upgrade: A future case version may include an external charging board with a BMS (like a TP4056 module). There is already some free space inside for this.