That helmet has an incredibly good battery life. I wish my phone would stay charged half as long.

Hyperion_Zero said:

That helmet has an incredibly good battery life. I wish my phone would stay charged half as long.

Crystal cell batteries can last for years and you can make these at home with crap you can buy from grocery and hardware stores.

Котенок said:

Crystal cell batteries can last for years and you can make these at home with crap you can buy from grocery and hardware stores.

They last a long time but they can't handle much of a useful load without deteriorating rapidly. At least that is what I remember hearing. Like some people were trying to say this stuff like the Oxford Bell is perpetual motion and free energy and all that but I don't think it works that way. Entropy wins in the end.