Heated grips are okay... But they only work as well as you can keep the wind off your hands. Down through about 35 degrees, heated grips and insulated gloves are great. Below that, I've tried insulated leather gloves, uninsulated leather gloves with the silk/wool/UA liners, and either combination with grip heaters. After a while, the cold wind always bleeds through. Those battery powered liners look great (and reasonably priced at $50), since I DO NOT want to be wired to my bike.
Gerbings does have some battery powered gear, but it's not meant for riding- it doesn't have as many heating elements. If you had the right battery pack though, you could run their moto-specific stuff without wiring to the bike.
Moto Glove Liners:
http://gerbing.com/Products/Gloves/liner.html
Moto Jacket Liner:
http://gerbing.com/Products/Liners/h...cketLiner.html
Battery Jacket Liner:
http://www.gerbing.com/coreheat.net/...%20Jacket.html
There are also Hippo Hands (
http://www.hippohands.com/Hippo%20Hands.htm) and bark busters...