What should I do if the jump starter shows a reverse polarity alarm?
If the clamps are connected with incorrect polarity, the unit will sound a continuous alarm and the LCD screen will display the Alarm Icon, the "+" and "–" signs, and the Reverse Polarity Icons flashing. Immediately disconnect the clamps and reconnect them to the battery with the correct polarity. (Page 8)
From the official Everstart Maxx 1200A Jump Starter manual, page 8
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