Engineers vs accountants the handwarmer mix. With schematic - Video

Such a weird product. Really good circuitry sabotaged by dumb penny-pinching.

I had high expectations that this design was going to be minimalist and very crappy. But it's not. The circuitry is actually pretty good, which makes the cost motivated economy of just one component a bit perplexing.

The listing was notable for saying it has a 5000mAh cell (it doesn't), has low risk of explosion (which is always good), heats on both sides (it doesn't) and can be used to heat your feet and other body parts too.

People like us with technical skills could upgrade this unit by beefing up the lithium cell to something more sensible. But the use of a flat heater panel jammed against a concave plastic case just doesn't quite transfer heat as well as the posher version with metal heat plates does.

On a plus note, the circuitry is nice with a couple of good educational parts to inspire other designs.


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