thanks guys,

I was thinking of the ones with portable batteries as wiring to the battery in not an option for me (so that I can wear them on any bike)
Gerbing are well established in this field so I will have a close look at them.

gscp

your keis battery sits in your pocket as opposed inside the glove cuffs? This sounds interesting.

My big prob with cold and numb finger is operating the brake lever which becomes very slow