Do You Know What a HHO Dry Cell Is

Why is The Hho Dry Cell a Better Design ?

Well first off you need to know in general what an "HHO Generator" is.
An hho generator is a more modern term used to describe the electrolytic cell. Believe it or not the hho cell pictured on this page is from 1890's - Why have we not been using hho gas by now ?? (how would they CHARGE you for water)
An electrolytic cell decomposes chemical compounds by means of electrical energy, in a process called electrolysis; the Greek word lysis means to break up. The result is that the chemical energy is increased. Important examples of electrolysis are the decomposition of water into hydrogen and oxygen.
Recently this gas has been nicknamed HHO Gas, more commonly known by scientific communities as Oxyhydrogen.

Oxyhydrogen is a mixture of hydrogen (H2) and oxygen (O2) gases, typically in a 2:1 molar ratio, the same proportion as water.[1] This gaseous mixture is used for torches for the processing of refractory materials and was the first[citation needed] gaseous mixture used for welding.

More to come I'm out of time today - meanwhile here is a very good explanation as to what is an hho dry cell.