Replace 600 cca battery by a 500 cca battery? - Diesel Forum - TheDieselStop.com
7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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post #1 of 4 (permalink) Old 05-22-2019, 09:32 PM Thread Starter
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Replace 600 cca battery by a 500 cca battery?

I have a Ford 1996 converted E-350 Econoline V8 7.3L ambulance and both my front batteries are death. One is a fairly standard battery (850 cca, 1000 ca, group 65), but the other one is a special emergency heavy duty battery (600 cca, group 50) which means I need to order it and it costs so much more than the standard battery. Anyone knows if it would be possible to replace the emergency battery with a slightly lower cca battery, f.e. a 500 cca, 625 ca, group 51 battery? The 51 group battery is only 2cm wider (I still need to check if it would fit properly) but the other measurements are a bit smaller that the group 50 battery.

Since all the very heavy ambulance equipment is gone and replaced by a simple bed and small kitchen and I'm not towing anything I thought I could go with a slightly lighter battery, or doesn't it work like that?

Any help would be highly appreciated.

Sofie
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post #2 of 4 (permalink) Old 05-22-2019, 10:03 PM
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I would try to put two identical group 65 batteries in there if it is possible. Even if you had to get a new battery tray, I think it would be worth it.
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2001 F350 XLT 4X4 crew cab, dual rear wheels, long bed, black, 7.3l turbo diesel, automatic transmission, 4.10, shift on the fly, running boards, sliding rear window, 38 gal fuel tank, Odyssey extreme 65-PC1750T batteries, Michelin LTX-MS2 rear tires, Sumitomo Encounter front tires, Shell Rotella Ultra elc, 11,500 gvwr, 20,000 gcwr, 7500 gvw, completely stock, 114,000 miles when purchased, now has 250,000 miles, repairs so far: two starters, batteries, cps, brakes, tires, alternator, ball joints, locking hub, wheel hub, AC compressor, serpentine belt, power steering pump, driver's side window, ignition switch, o-ring, Spectra premium radiator, water pump, fan clutch, fan blades, thermostat, thermostat housing, tensioner. Stolen twice so far, but recovered both times with major damage.

2005 Nomad Rampage toyhauler made by Skyline. 11,500lb gvwr.
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post #3 of 4 (permalink) Old 05-23-2019, 10:21 AM
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Any 12V battery will work fine. The higher the reserve, the longer it will power things while the engine is OFF. A high-quality flooded-cell (normal) battery is much better (performance for the money) than any specialty (AGM, dry cell, Lithium, etc.) battery. I recommend MotorCraft TesteToughMax, Sears DieHard Gold, & Interstate MTP/MT2. Read the captions in this photo album:


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post #4 of 4 (permalink) Old 05-23-2019, 11:24 AM
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Quote:
Since all the very heavy ambulance equipment is gone and replaced by a simple bed and small kitchen and I'm not towing anything I thought I could go with a slightly lighter battery, or doesn't it work like that?
Yes it does. A set of Optima Red Top AGM 800CCA batteries are long lasting and have plenty of power. I've gone through 2 sets over the years and each set was still holding up after 6 years service. These engines require 800-900 CCA batteries because first, the glow plugs suck a LOT of amperage and secondly the starter requires way more amps than a gas engine starter. The boat/RV batteries are designed to be fully discharged then recharged for longest life. They don't hold up as long in an automotive/truck normal use.

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