Re: 640 Battery

Posted by John Wogec On 2021/9/18 17:21:21

I just finished the restoration of the big model 645 straight 8 and used the Optima 6 volt car battery (Optima Batteries OPT8010-044 6V RedTop Starting Battery). It has 800 amps of cranking power and you don't have to worry about corrosion. It cranked those brand new piston rings like nobody's business, but it also cost just over $200. I know guys that use them exclusively and they last about 6 years. It's worth the money for me to not have to worry about the corrosion issue. You can get a really slick trickle charger on ***zon for about $30.00 that also works as a trickle charger for 12 volt batteries. (NOCO GENIUS1, 1-Amp Fully-Automatic Smart Charger, 6V and 12V Battery Charger, Battery Maintainer, Trickle Charger, and Battery Desulfator with Temperature Compensation). That setup has worked well for me