I've run a Dyna Bat dry cell battery, 13.5 lbs, from Davis Unified Ignitions (avail at Summit Racing) for over 5 years in my 318 65 Cuda. I let it sit in storage for 1 year and then two winters without charging and it is still working great after a good trickle charge. I really like it. Seems to have plenty of juice to crank over a V8.