There are plenty of fancy heated blankets on the market these days. Most of them need to be plugged in to work. The Heatwave Battery Powered Heated Blanket is rechargeable and wireless. It comes with 3 heating levels and can be used indoors and outside. The battery lasts up to 3 hours depending on the mode you choose.
This 60 x 48″ electric heated blanket comes with overheat protection. In high, medium, and low mode, Heatwave has a temperature of 131F, 113F, and 100F respectively.
[where to get it] [official site]
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