How to jump start a car battery with the portable battery jumper
1) make sure portable jumper is in off position
2) clamp the red positive + to the positive + end of the battery.
3) clamp the black negative - to a metal frame of the car
4) turn on the portable jumper and let it charge the car for 10 seconds.
5) start the car.
6) important! turn OFF the portable jumper and remove the black then red clamp.
Recommend that you drive the car for about 20 minutes. If the car needs to park later, be sure to drive it again a little after 6 hours for 20 mins
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This instruction can apply to similar portable car jumpers on the market.