GMC HUMMER EV 2023 Owner's Manual page 346

Warning
Batteries can hurt you. They can be
dangerous because:
They contain acid that can burn you.
They contain gas that can explode or
ignite.
They contain enough electricity to
burn you.
If you do not follow these steps exactly,
some or all of these things can hurt you.
Caution
The vehicle is equipped with an AGM/
VRLA 12-volt battery, which can be
damaged by using the incorrect type of
trickle charger. An AGM/VRLA-compatible
charger must be used, with the
appropriate setting selected. Follow the
trickle charger manufacturer instructions.
Caution
Ignoring these steps could result in costly
damage to the vehicle that would not be
covered by the vehicle warranty. Trying
to start the vehicle by pushing or pulling
it will not work, and it could damage the
vehicle.
The battery is under a cover in the
underhood compartment.
To access the battery under the hood, the
left cover needs to be removed.
Before you connect the cables, here are
some basic things you should know.
Positive (+) will go to the positive (+)
terminal. Negative ( ) will go to the
negative ( ) terminal on the battery
providing the jump start to the negative
grounding point for the discharged battery.
Caution
If the jumper cables are connected or
removed in the wrong order, electrical
shorting may occur and damage the
vehicle. The repairs would not be covered
by the vehicle warranty. Always connect
Caution (Continued)
and remove the jumper cables in the
correct order, making sure that the cables
do not touch each other or other metal.
Connection Points and Sequence
1. Discharged Battery Positive (+)
Terminal
2. Good Battery Positive (+) Terminal
3. Good Battery Negative ( ) Terminal
4. Discharged Battery Negative ( )
Grounding Point
(Continued)
Vehicle Care 345