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Batteries:


Table 1. Batteries - Diesel

Supplier Part/Product Number CCA RC Verified
AM General 5937120 770 115 HML
ACDelco 78-7YR 770 120  
East Penn Deka nnnn      
Interstate Mega-Tron Plus MTP-78 800 110  
Ameritron 65-78 800 110  
Motorcraft BXL78      


Table 2. Batteries - Diesel (Alternate)

Supplier Part/Product Number CCA RC Verified
Optima
(See notes (OPTNOTE) and (OPTWNCH))
D34/78-950 750 124 HML
800U
(See note (OPTNOAC))
800 120 HML


Table 3. Batteries - Gas

Supplier Part/Product Number CCA RC Verified
AM General 5937120 825   HML
East Penn Deka nnnn 825    


Table 4. Batteries - Gas (Alternate)

Supplier Part/Product Number CCA RC Verified
ACDelco 78-7YR 770 120  
Interstate Mega-Tron Plus MTP-78 800 110  
Ameritron 65-78 800 110  
Optima
(See notes (OPTNOTE) and (OPTWNCH))
D34/78-950 750 124 HML
800U
(See note (OPTNOAC))
800 120 HML


Table 5. Battery Requirements

  Diesel (×2) Gas
BCI/OEM Group Size: 78 78
CCA at -18°C/0°F: 770 825
RC in Minutes: 115  


Notes:

  1. AMG P/N 5937120 is the 12-volt battery. It is used in all Hummers, including gassers and Alpha. Different part numbers used in earlier years, but no longer available.

  2. The battery requirements are as listed by AM General.

  3. CCA (Cold Cranking Amps). The Battery Council International (BCI) defines CCA as "the discharge load in amperes which a new fully charged battery at 0°F (-17.8°C) can continuously deliver for 30 seconds and maintain a terminal voltage equal to or higher than 1.20 volts per cell".

    CCA is usually considered to be the primary consideration for battery capabilities. As listed by AM General, this should be considered as the minimum requirement for normal usage.

  4. RC (Reserve Capacity). The Battery Council International (BCI) defines Reserve Capacity as "the number of minutes a new fully charged battery at 80°F (26.7°C) can be continuously discharged at 25 amperes and maintain a terminal voltage equal to or higher than 1.75 volts per cell".

  5. The variant BCI or OEM Group Sizes are 34/78 (also noted as 78/34 in some reference, has both top and side posts) and 78U (top posts only). These sizes are generally not recommended.

    Many of the Group 34/78 are not capable of full current flows through the side post terminals necessary for the winch. Also, some owners have reported interference between the top terminals and the battery hold down bracket.

  6. (OPTNOTE) The Optima batteries require modifications to the hold down bracket.

  7. (OPTNOAC) The Optima 800U battery (Red-Top or Starting battery) may only be used in applications that do not utilize an electric winch or have an vehicle accessory current draw of more than 10 amps. Otherwise, use a Yellow-Top or Deep-Cycle battery if you wish your battery to be under warranty.

  8. (OPTWNCH) Optima explicitly states in their User's Guide that high amperage accessories are not to be connected to the side terminals. Connections for the winch must be made using the top terminals only.

  9. Since the batteries are used in trucks over one-ton and/or with high-discharge rates (winches), most battery manufacturers will apply commercial use warranty restrictions (reduced warranty benefits).

  10. The following torque recommendations are normally made for battery connections:
    • SAE automotive terminal (top-post):  50-70 inch-lb.
    • Side terminal:  70 inch-lb.


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