GMC Hummer EV 2023 Owner's Manual page 280

GMC Hummer EV Owner Manual (GMNA-Localizing-MidEast-16569278) -
2023 - CRC - 1/25/23
280 Vehicle Care
Keep the vehicle plugged in, even when fully
charged, to keep the high voltage battery
temperature ready for the next drive. This is
important when outside temperatures are
extremely hot or cold.
Propulsion power may be reduced in
extremely cold temperatures, or if the high
voltage battery is too cold. The message
BATTERY TOO COLD, PLUG IN TO WARM will
display. If the message displays, a level 2
charger is required to heat the battery to a
minimum temperature to enable propulsion
or charging.
A vehicle cover, which can reduce sun
loading on the vehicle and improve high
voltage battery life, is available from your
dealer.
Vehicle Storage
The best way to store the vehicle for any
length of time is to plug in the charge cord
and leave it plugged in. The vehicle
monitors and maintains the 12-volt battery
daily. It is okay to leave the vehicle plugged
in for extended periods of time. Once
charged to full, very little energy is required
to maintain the 12-volt battery and high
voltage battery.
If it is not possible to charge the vehicle
with the charge cord left plugged in, be sure
to fully charge the high voltage battery
before storing. The vehicle will stop
maintenance of the 12-volt battery if the
high voltage battery state of charge gets
too low.
When storing the vehicle on a long-term
basis:
Keep the high voltage battery state of
charge at 30%.
Attach an AGM/VRLA compatible battery
tender or trickle charger to the 12-volt
battery.
Keep the remote key more than 3 m
(10 ft) away from the vehicle.
12-Volt Battery
Warning
Batteries have acid that can burn you and
gas that can explode. You can be hurt
badly if you are not careful.
Always wear eye protection. Follow
instructions carefully when working
around a battery.
(Continued)
Warning (Continued)
Battery posts, terminals and related
accessories contain lead and lead
compounds which can cause cancer and
reproductive harm. Wash hands after
handling.
Do not disconnect the 12-volt battery during
storage.
A trickle charger may be attached to the
12-volt battery terminals or trickle charge
from the underhood remote positive (+) and
negative ( ) terminals. See Jump Starting
0 317 for location of these terminals.
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.