these are made from 3 types of salt a magnesium rod and a peice of copper pipe. can run for years without fail.
- lithium ion
- forklift and golfcart battery
- ford escape batteries seem really good for winter applications – nickle hydride
- hydrogen fuel cell and tanks
- natural gas – corncob tanks ?
- hydro storage
- storage of weighted blocks above and below ground.
- hotwater tank
- methane – biogas above/underground resovior for storing methane.