I was chatting to a guy on a pedelect the other day at my local cafe. I have chatted to him once or twice before, he rides about a 30 mile round trip to work and back every day. He had some heated gloves with him that his wife bought him last Christmas. They were made by Sealskinz, each one had their own individual battery, he absolutely loved them. Said he cycles to work in all weathers unless there is ice on the ground and so making it too dangerous for two wheels.The most useless have been heated gloves.
He said there is still some glove battery left when he gets to work but not enough to get home so he puts them on charge while he is there. He said it has made a massive difference to him as he used to really struggle with cold hands while cycling in the winter.
He did say they were fairly expensive though, I've had a look and they are around £150, I am seriously thinking of getting some because I also suffer with cold hands while cycling in the winter and have tried many different gloves and never been happy with any of them.
If I do buy some I will report back to the forum my findings.