Battery Powered Block Heater

Anyone ever use a battery powered blanket for warming machinery/equipment in the cold?

For some reason, I got it into my head that a 5F/-15C morning would be the perfect time to do some brush hogging with my walk-behind DR mower out at my orchard. After about 10 minutes of trying to get it started I gave up and decided it was not to be that morning. Last week, I was dealing with low pressure in a really cold propane torch I was trying to use, and there are couple more months of winter to go.

I've been looking for an easy way to heat things up while out there, but don't have electricity or gas available at the orchard. Burn barrels can throw off a lot of heat, but would be a bit of a pain to set up. So, I've been thinking about using an inexpensive battery powered blanket as a makeshift block heater and was wondering if anyone has tried something similar. If so, how well did it work?

I have never tried this, but I'm sure it would help.
I wonder how long a battery would last?
Might, take a bit to  heat up the metal enough for it to be above ambient room temperature.

Battery heat might be worth trying, just remember heat rises in air so put the blanket under or all around not over what needs heat.

thomas rubino wrote:I have never tried this, but I'm sure it would help.
I wonder how long a battery would last?
Might, take a bit to  heat up the metal enough for it to be above ambient room temperature.

According to Amazon, it say's it should last about 4 hours on a standard 20V DeWalt battery, so I'll figure 2 hours per battery. Luckily, I have several so that shouldn't be a problem. I doubt it will ever get things warm, but just going from 5F to 45F would be a huge improvement for some things.

Decided to spend $30 and order one. Will report back in a week or two with the results.