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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)
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)
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:
- 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.
- The battery requirements are as listed by AM General.
- 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.
- 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".
- 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.
- (OPTNOTE) The Optima batteries require modifications
to the hold down bracket.
- (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.
- (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.
- 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).
- 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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