Re: Jig for pre-warming 'shed shoes'
For those who need continual warming of the feet, rather than pre-warming of the shoes, heated insoles are readily available online or from sporting equipment suppliers.
Some are 12/14 volts, intended for use on motorcycles or in cars.
Others are 5 volt, USB powered, these could be readily powered from a 4 cell rechargeable battery pack.
If anyone needs affordable, high capacity rechargeable D cells for this or any other use, these may be found on ebay.
Search for "emergency lighting battery" This will find mainly industrial quality D size 4AH nickel cadmium cells, ready assembled into various voltage packs. (other search terms tend to find mainly loose cells)
Expect to pay in the region of £10 for a 4 cell pack.
These batteries are robust and long lasting, charge at about 200ma forever or at about 400ma for about 14 hours. No sophisticated charger is needed, a 12 volt DC supply, series silicon diode, and a suitable lamp as a dropper resistance will serve.
A small fuse close to the battery is vital as the short circuit current is substantial.
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