A: The procedure is relatively simple.
1. Park the booster vehicle close to, but not touching, the one needing a jump and turn off the ignition.
2. Connect once positive (+) clamp to the positive terminal of the healthy battery and the other positive clamp to the positive terminal of the dead battery.
3. Next, connect a negative (-) clamp to the negative post on the good battery.
4. Finally, connect the other negative clamp to the engine block, frame or other grounded metal on the dead vehicle away from the battery. (You want to avoid sparks in the vicinity of the explosive hydrogen gas that emits from the battery.) Do not connect it to the ground terminal (negative).
Start the booster vehicle first and let it idle for a moment. Then try to start the dead vehicle. Once you get it started, let it idle for a few minutes before disconnecting the jumper cables in the reverse order in which they were applied.
When using a portable battery booster, the process is the same.