thruth - whats the good oil on those heated jackets that you plug into a battery?
Still a niche market. I know bikers and snowmobilers who use some heated products - gloves, mitts, helmets, fewer jackets but this is because you can plug it into the machine. Higher voltage, Angus.
I saw a stand-alone 18 volt lithium battery rig jacket the other day at Cabelas plus a battery powered base layer.more like a flak jacket.
Once the temp drops below freezing, lithium batteries lose effectiveness. 50% drop off in battery life at room temp versus 0 C. Same way my IPhone battery sucks down in minutes.
Problem is these jackets are fugly, not constructed well and lack any practical and technical design.
Basically a windbreaker or fall jacket with a battery and a heating element.
Back in the day there were butane pocket warmers which no one really used. Zippo still makes them.
I don't put too much stock in heated garments for cold weather because if they fail, you are left with a jacket that is useless on its own.
I'd rather regulate temp with layers and venting that with something I have to worry about plugging in before I wear it.