"Powerizer Batteries", with capacitors?

[MetalMan]

An 80v, 5600uf capacitor would be GIGANTIC (your 2nd ebay link isn't working, and I didn't see it before). All you need is something with about twice the voltage of what you will be running. 14 cells are about 16.8v. This is where I got the 35v capacitor idea from.

Too high of voltage won't affect the charge much. You don't need to worry about that.