ThunderboltSocks.com
Title
Thunderbolt Heated Electric Socks cold feet foot warmers
Description
Thunderbolt Battery Pack
The present Thunderbolt sock heating system represents the culmination of over 20 years refining a practical method for staying warm outdoors on cold days. Heated sock designer, Bob Williams, says he saw his first electric socks when he received a pair for Christmas in 1958. They were powered by two six-volt lantern batteries and produced good heat - for a short time. A major problem soon surfaced; buying replacement batteries became very expensive for a high school student!
Fast forward to 1975:
Realizing that a rechargeable battery was a must, Bob snipped the cord to the lantern batteries and devised an over-the-shoulder sling to hold a motorcycle battery. At last there was substantial rechargeable electric power for the socks. However, climbing into a tree stand carrying this battery with liquid sulfuric acid sloshing around wasn't yet the perfect solution.
The 1980's, enter the NiCad rechargeable battery:
At last on the market appeared a powerful, sealed, reasonably lightweight battery. Bob quickly bought a video camera battery and modified it to work with his sock heating system. Unfortunately, a problem with the nickel-cadmium battery proved to be its "memory" effect. Unless great care was taken during the recharge cycle the battery soon lost a significant portion of its electrical capacity. All in all however, the heated socks were becoming practical and easy to use.
