I've been playing around with heated gloves this winter. For as long as I can remember, I've suffered with 'wood-cutters finger' or 'white finger disease' if you like, considered to be a mild form of Raynaud's disease. It's very frustrating having warm palms, but my fingers are like frozen white sticks from the second joint up to the tips. Once this condition is triggered, the only way to pink-them-up is by applying external heat. My feet stay warm even in the coldest conditions.
The first pair of heated gloves I tried were those from Maplins. 2650 mAh rechargeables give two hours of heat, enough for a twenty mile winter ride. They are of course a little bulky, but that's a small price to pay for avoiding frozen digits.
The second pair I sampled were BlazeWear, at almost double the price of the Maplins version. These have two heat settings and also heat the back of the hand ( which I don't need ). The problem is, unlike the Maplins, the cuffs are very short which meant I could feel the battery packs pressing against the back of my hand while riding. Another problem arose when trying to remove or replace the battery boxes, the zip closure on the battery pouch is far too narrow to allow easy access.
Possibly top of the range are the offerings from Gerbing, with a price range to match. Superb for extreme low temperatures experienced by snow-mobile drivers, and of course motorcyclists. The speed of these machines, and therefore the chill-factor, is much higher than that experienced at cycling speeds. A bit of an overkill I think.
One interesting thing I found when investigating the options, almost all heated gloves use the same size battery box, 70 x 49 x 14 mm. A twin pack of 3.3 ah Lithium Polymer batteries complete with dual charger can be purchased for around £38 + P/P. These are fitted with the same DC socket as the AA versions, and would increase the heating time to a little over three hours. I reckon frozen nasal cavities would get me first!
If my memory serves me correctly, a posting on the forum last winter suggested 'White finger' was triggered by temperature sensors in the scalp. Having retained all of my original fur, I have never needed to wear a warm hat in the winter, perhaps I should try one!
Happy 'frost-biting'
Bob