Originally Posted by
Ogsarg
Anything electric is going to be impractical due to battery capability. Calculate how many watts are required to keep warm and figure out the size of the battery you need in order to keep them powered for any length of time. I guess if you were willing to cart around a heavy battery you might be able to make it work but otherwise your better off looking at better quality clothing.
Depends on what you are talking about. Heated soles and gloves work OK. A heated vest would be more challenging, but they do exist.
I run my soles off 18650 cells, one for each foot.
0.8A gives me just shy of 3W for about 4 hours as a theoretical limit.
IRL, I begin to feel the fade after about 2 hours.
Now, "any length of time" may obviously mean different things to different people. But 2 hours full function and one hour more of acceptable function is enough to be useful IMO.
For my part, unless it's really bitterly cold, I don't need to run the heaters continuously. I probably use a duty cycle of 1/3 or thereabouts, which stretches use time considerably.