How to Jump Start a Nissan Leaf

1. Park the two vehicles close enough for the 12-volt batteries to be near each other, without letting the vehicles touch.
2. Apply the parking brake, push the P (Park) button, and switch off unnecessary electrical systems.
3. Place the power switch in the OFF position, remove the battery vent caps if fitted, and cover the battery with a wrung-out moist cloth.
4. Connect the jumper cables in the sequence shown in the manual's illustration, then start the engine of the booster vehicle.
5. While the booster engine runs, place the power switch in the READY to drive position.
6. Carefully disconnect the negative cable first and then the positive cable, in the illustrated order.
7. Keep the READY to drive position for over 20 minutes to charge the 12-volt battery, then replace the vent caps.

• Always connect positive (+) to positive (+) and negative (−) to body ground, not to the 12-volt battery.
• If the 12-volt battery is discharged, connect the jumper cables to the booster vehicle before pushing the power switch.
• If the system does not start, push the power switch to OFF and wait 10 seconds before trying again.

Source: 2026 Nissan Leaf owner's manual, PDF pages 521, 522. Steps are summarized in our own words (AI-assisted, checked against the cited pages 2026-10-18). Other model years can differ; your manual has the final word.