Mazda CX-9 2018 Owner's Manual page 530

If Trouble Arises
Battery Runs Out
CAUTION
Use only a 12 V booster system. You can damage a 12 V starter, ignition system, and other
electrical parts beyond repair with a 24 V power supply (two 12 V batteries in series or a 24 V
motor generator set).
Connect cables in numerical order and disconnect in reverse order.
Jumper cables
Discharged battery
Booster battery
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CX-9_8GC3-EA-17G_Edition1 2017-5-29 10:13:38