Ok to run two different batteries, or no? - Diesel Forum - TheDieselStop.com
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1999-2007 General Questions General questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

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Old 11-23-2010, 07:35 PM   #1 (permalink)
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Ok to run two different batteries, or no?

Is it okay to have two different batteries in the truck? My truck (in sig) starts a little more slowly than it should. Did it when we had warm weather too, it's not just a cold weather problem. I feel it's the starter getting weak, and I have a new one I need to install. But, I have a nearly new 850cca battery in the '87 truck in my sig. I would like to take this battery out, put it on one side of my psd, and see if that makes any difference. The batteries in it are 844 cca right now, which I know are a bare minimum.

I would like to swap in the new 850 from my '87, see if it helps, then purchase another 850 just like it in a couple weeks to match it. I can take the two batteries currently in the truck, and put them in each of the other trucks in my sig. I feel certain they would be perfectly fine in either of those trucks.

When I put my new starter in, I'm gonna also check all my connections; make sure they are tight, and make sure they aren't corroded and the wires aren't going bad at the terminal.
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87 f250 4wd LB ex cab 460 bored .60 edelbrock intake, towing cam glasspacks-6 mpg 8 on good day- my pride & joy once towed my '85 j-co j-crane 28' 5er

99 F250 7.3(engine stamped june of '99) 250K white ex cab lb, 2wd
jl audio slash 4ch amp, jl 8" sub, focal components front, infinity coax rear, 10 disc changer

-tymar intake, no muff
-bullydog egt, autometer boost
-f5 chip w/80t, 80e, 60t, 100, 140 extreme(140 is amazing!)
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Old 11-24-2010, 12:44 PM   #2 (permalink)
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No, it's not OK.

The batteries are a set and part of the electrical SYSTEM, including the alternator. Batteries should always be matched for CCA and replaced as a set. If you don't, the weaker battery will drain the other, and place a stress on the alternator. You will be constantly replacing the weaker battery and lowering the life of both at the same time.

Reid
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Old 11-26-2010, 03:53 PM   #3 (permalink)
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Usually not a good idea as OMCUSNR replied but if both batteries are lead acid, same group and close to the same CCA and AH you may be good to go but I always replace them in pairs.
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Old 11-26-2010, 04:52 PM   #4 (permalink)
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not a good idea. beware of battery sales. there are manufacturing date stamps on batteries. try not to buy anything that has been sitting around for a long time.
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Old 11-26-2010, 05:36 PM   #5 (permalink)
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Thanks guys. I won't try to run the 850 with the batteries that are in there. The newer 850 was only used in the old truck maybe 5 times max before I parked it due to a hellacious exhaust leak that I haven't fixed yet. I've kept a battery maintainer on it the whole time. If I buy another battery exactly like it, okay to run both of them?
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87 f250 4wd LB ex cab 460 bored .60 edelbrock intake, towing cam glasspacks-6 mpg 8 on good day- my pride & joy once towed my '85 j-co j-crane 28' 5er

99 F250 7.3(engine stamped june of '99) 250K white ex cab lb, 2wd
jl audio slash 4ch amp, jl 8" sub, focal components front, infinity coax rear, 10 disc changer

-tymar intake, no muff
-bullydog egt, autometer boost
-f5 chip w/80t, 80e, 60t, 100, 140 extreme(140 is amazing!)
Garrett 38r
Chrome fender trim, 265 nitto terra graps, nerf bars, billet grille, '06 headlights, chrome door handles, louvered 5er tailgate
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Old 11-27-2010, 05:32 PM   #6 (permalink)
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if you buy another 850cca. i would use the good one that you have out of the other truck if it were me.
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Old 11-27-2010, 08:03 PM   #7 (permalink)
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Quote:
Originally Posted by mwe-maxxowner View Post
Thanks guys. I won't try to run the 850 with the batteries that are in there.
You can if you want, it won't hurt anything.
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Old 11-27-2010, 09:39 PM   #8 (permalink)
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Quote:
Originally Posted by claw444 View Post
if you buy another 850cca. i would use the good one that you have out of the other truck if it were me.
Yep, I think that's definitely what I'm gonna do. Even if it doesn't crank slowly with the new starter in, just for some peace of mind. The other truck isn't driven all that much, and I think one of the batteries in my psd currently would crank that old truck fine, especially if I keep a battery maintainer hooked to it all the time, which I will. And I can put the other old battery from the psd in my mud truck, which is also rarely used, and is in need of a battery.
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87 f250 4wd LB ex cab 460 bored .60 edelbrock intake, towing cam glasspacks-6 mpg 8 on good day- my pride & joy once towed my '85 j-co j-crane 28' 5er

99 F250 7.3(engine stamped june of '99) 250K white ex cab lb, 2wd
jl audio slash 4ch amp, jl 8" sub, focal components front, infinity coax rear, 10 disc changer

-tymar intake, no muff
-bullydog egt, autometer boost
-f5 chip w/80t, 80e, 60t, 100, 140 extreme(140 is amazing!)
Garrett 38r
Chrome fender trim, 265 nitto terra graps, nerf bars, billet grille, '06 headlights, chrome door handles, louvered 5er tailgate
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