I've got a keiss heated waistcoat and heated inner gloves.
I tend to run the gloves off a seperate battery - which can last all day on a low setting, and run the waistcoat on the bike battery.
They were a godsend when we went to peak district last year at easter when it was close to freezing temps (-1 at the cat & fiddle).
I have 5 settings on my battery so if I'm going to be out all day I put it on low.
I like having a seperate battery as I can use it for other non-motocycling activities - like cycling or watching the rugby.
