What the battery does:
1. Starts the engine
2. Provides electrical power to the vehicle when running and is recharged by the alternator.
3. Provides electrical power to the vehicle when it is not running.

CA, CCA, and RC
CA - is cranking amps measured at 32 degrees F.
CA Value is not as important as CCA
CCA - is a measurement of the number of amps a battery can deliver at 0 ° F for 30 seconds and not drop below 7.2 volts.
CCA - Larger CCA is always better and is usually a heavier battery.
RC - This is the number of minutes a fully charged battery at 80 ° F will discharge 25 amps until the battery drops below 10.5 volts.
This is the minutes you have if the alternator stops charging the battery.

truckbatterydeal.com (SERIES 31 Comparision)

Lead-Acid
31XHD-V (31X)
CCA 925
RC 180 minutes
55 lbs.


AGM - Absorbent Glass Mat
RF-31D
CCA 700
RC 200 minutes
69 lbs.

Bottom-Line
1. Use the same CCA as original equipment.
2. If the engine gets harder to start, upgrade to higher CCA
3. Higher CCA will never hurt your vehicle, it just weighs more.


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Distributors of Quality Auto & Truck Batteries
31D (31D)
CCA 660
RC 160 minutes
49 lbs.

31HD-V (31H)
CCA 750
RC 180 minutes
l51 lbs.
RECOMMENDED
31 (31S)
CCA 660-925 (Use same CCA for pair, check label)
RC 160-180 minutes
49-55 lbs.
31S Batteries have typically gone a little over shelf life, but still have a two year warranty.