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Comment by skyberrys | Hacker News Reader

The custom Lipo battery with thermal effects and weight considered is really beautiful to see. I've been curious about custom Lipo battery shapes for rings because my fingers get cold when I wear rings. Would a battery heating up just a bit help make that comfortable for me?

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Would a battery heating up just a bit help make that comfortable for me?

In something ring-sized? Maybe for about five minutes, and then the battery dies. (I assume you mean using resistive elements to create heat; heating the actual battery seems like a bad idea.)

My bad, I read the article wrong, they are only concerned with thermal heating while it's charging. I did seem unexpected that a ring could heat up enough to be a concern while being worn.

> my fingers get cold when I wear rings

Unless the ring is shaped as a heatsink/radiator, I imagine it would eventually get into equilibrium, and you wouldn't feel the heat-flux.

Is it possible that the "coldness" comes from its indirect affect on blood-circulation?

Yes I think you are right and also fingers tend to swell and shrink with heat and cold so the ring that fits nicely in a cooler room will restrict circulation slightly once I'm feeling warmer, leaving me with one cold ring wearing finger.

A battery. Which can catch fire. Around your finger?

Phones catch fire and men tend to stick them in the front pant pocket. But yes true, so far I haven't gotten into smart jewelry. I was pretty into jewelry for a while but never rings because of the cold finger situation. Necklaces can be problematic too. I chipped my front tooth slightly when I jumped wearing a big crystal and smacked myself in the face with it.

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