Batteries

[David Langford]

Probably already been asked, but before coffee, my search capacity is limited. But, in a 2018 2500 Cummins are the 2 batteries in parallel (I know it is 12v but are the batteries are linked), or are they independent? My main battery may be at EOL, question is do I have to replace both, or can I get away with just one?

I’m thinking just take the dive and do both so they’re always the same age.

Also, can someone confirm they are both DIN 97E?

 

[BossHogg]

Yes, they are hard-wired together in parallel. You should replace both at the same time because the older battery can drag down the new battery.

 

[mtnrider]

Replace both, always. It's just a matter of time before the other one goes and drags the new one down with it.

 

[turkeybird56]

Replace both, always. It's just a matter of time before the other one goes and drags the new one down with it.

DITTO @!@!!!@ ^^^^^^^^^^ Always replace paired batteries, and they are in parallel.

94R H7 Batteries is what shows from Autozone/Oreilly. CCA dependent upon wat U buy. I would not cheap out on CCA rating.

 

[2003F350]

DITTO @!@!!!@ ^^^^^^^^^^ Always replace paired batteries, and they are in parallel.

94R H7 Batteries is what shows from Autozone/Oreilly. CCA dependent upon wat U buy. I would not cheap out on CCA rating.

Agreed. Always replace in pairs, and more CCA is never a bad thing in my experience. Manufacturer puts in bare minimum, and a lot of dealers/repair shops do the same. Personally I never go with less than an 850CCA battery, prefer higher. MOST vehicles come with a 750CCA battery (or a pair of them if they're a dual battery setup). In my experience, unless you've got a low-output 4-banger, it's just not enough.

 

[turkeybird56]

Agreed. Always replace in pairs, and more CCA is never a bad thing in my experience. Manufacturer puts in bare minimum, and a lot of dealers/repair shops do the same. Personally I never go with less than an 850CCA battery, prefer higher. MOST vehicles come with a 750CCA battery (or a pair of them if they're a dual battery setup). In my experience, unless you've got a low-output 4-banger, it's just not enough.

Well I do not have a Diesel anymore but I sure as heck replaced my OEM with Duralast Premium H7 AGM at 850 CCA.

 

[nlambert182]

I won't repeat everything that's been said, so I'll just say ditto to all of the above!