7500 International Truck Batteries

A.H. is just an amp rating for standby use. Not as important as the CCA rating unless you plan on running low power draw accessories with the truck off. More batteries in parallel equals more available amperage for cranking. I wouldn't do any less than three at 800ish CCA. I have 4 in my truck w/15 litre and they'll crank that engine over at freezing like nothing.

 

For your engine, 3 batteries will crank just fine. 4 batteries is fine too. 145 amp alternator is perfect. I like to install batteries in the 700-800 CCA range. Higher CCA rating doesn't mean it is a better battery. The higher the cold cranking rating just means the actual plates inside the battery are thinner so they can get more plates to produce the higher amps. Problem is, since the plates are so thin, they put out a good amperage initially and quickly deplete. This is no good during a dead of winter cold start when your engine may take a big longer cranking time to actually fire. Lower CCA rated batteries will still be able to crank your engine over fast enough, but will be able to crank longer during those stubborn cold mornings. Thinner plates in higher CCA batteries also do not hold up as well for over all longevity with several charge and discharge cycles compared to slightly thicker plates in a lower CCA battery.

 

Protect your batteries from thieves. Battery locks can secure your batteries. see them at batterylocks.com or btldallas.com.