Jeep 2004 Liberty - Manual (Page 134)

The rear power outlet is a direct feed from the battery so
it receives power whether the ignition is in the ON or
OFF position.
All accessories connected to this outlet should be re-
moved or turned off when the vehicle is not in use.
CAUTION!
Electrical Outlet Use With Engine Off
• Many accessories that can be plugged in draw
power from the vehicle’s battery, even when not
in use (i.e., cellular phones, etc.). Eventually, if
plugged in long enough, the vehicle’s battery will
discharge sufficiently to degrade battery life
and/or prevent engine starting.
• Accessories that draw higher power (i.e., coolers,
vacuum cleaners, lights, etc.) will degrade the
battery even more quickly. Only use these inter-
mittently and with greater caution.
• After the use of high power draw accessories, or
long periods of the vehicle not being started (with
accessories still plugged in), the vehicle must be
driven a sufficient length of time to allow the
alternator to recharge the vehicle’s battery.
134 UNDERSTANDING THE FEATURES OF YOUR VEHICLE