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Can you leave a jump starter in a hot car?
Updated
Only within the maker's temperature limit, and that limit can be lower than you think. NOCO's support FAQ says not to store its Boost packs above 122°F for any reason. The GOOLOO A3 and GP4000 listings give 140°F. A closed car in strong summer sun can get very hot inside, so in a hot climate we would bring the pack in on the hottest days.
The makers' limits side by side
- NOCO Boost storage and use (support FAQ)122 °F
- GOOLOO A3 and GP4000 use and storage (listings)140 °F
- GOOLOO A3 charging (listing)113 °F
NOCO adds that storing a pack outside its range can damage several parts of the jump starter, and that this applies to all Boost models. The A3 listing also asks you to avoid long exposure to high heat and direct sun.
Where to keep it in the car
- Low and shaded. Under a seat or in the trunk well. Never on the dash, the rear shelf or a seat in the sun.
- In its bag or case. The GP4000 comes with a storage case, per the listing.
- Not while charging. The A3 listing caps charging at 113°F. Charge it indoors.
When to bring it inside
- Heat waves, or any day you park in full sun for hours.
- If you live somewhere with long hot summers, treat the pack like a laptop: it rides with you, it does not live in the car.
- After a jump, if the pack feels hot, let it cool before you pack it away.
Which pick has more heat margin
On paper, the GOOLOO packs list the higher limit. The GOOLOO GP4000 lists -4°F to 140°F. Caveat: owner reports on holding a charge are mixed. The GOOLOO A3 lists the same range. Caveat: some owners report the compressor quit early. The NOCO GB40 and GBX75 have the lower 122°F limit from NOCO's support FAQ. Caveat: that figure is not in the Amazon bullets we read, so check the manual too.
Heat also drains a pack faster. See how long a jump starter holds a charge and storage and charging.
Safety: a lithium pack that is swollen, leaking, very hot or smells odd should not be used or charged. Move it away from anything that can burn and follow the maker's disposal advice. Keep packs away from children.