RE: Have improved my earth battery set-up but now I have a question for the community 💡
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I wonder if USB heaters exist???
If you mean USB powered heaters, then there are some on eBay, but I currently do not know how effective they are. I have not tried them so far. I have not even heard about them so far. Sounds like an interesting idea.
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I had a look for USB powered heaters and there are loads! But it would seem they are not so effective. Better for warming your fingers than a whole room!
You can also run a mini fridge from a USB. Amazing.
By the way, if you are interested I have added the answer to my question as an update at the bottom of this post.
It turns out I need a step up converter.