The heating element pad spreads out to a fair amount of the back pretty well. With the zipper closed, it does a fair job of heating the torso.
Having something in the arms of the coat would be nice too though.
I don't know how long the battery lasts... I haven't run it down yet. I don't know the exact AH rating of the battery, but just by looking at it, it must be at least 2 amp-hours minimum. The heater draws 3/4th of an amp, so a two hour run time should be no problem.
Even after a really bad snow storm, it's never taken me more than forty minutes to shovel the driveway.
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