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1 comment of this product found across Reddit:
parametrek /r/OffGrid
1 point
1970-01-18 18:03:44.39 +0000 UTC

It might also be worth asking in /r/18650masterrace. Imho the handiest thing are voltage conversion boards. This one is the best I've seen so far. It can turn any DC voltage into any other DC voltage. It has a constant current knob so it can power large LEDs directly and it has an undervoltage knob to avoid overdischarge of you batteries.