Boost GB40 1000A 12V UltraSafe Lithium Jump Starter
Last verified by the Lifetime Picks Editorial Team
Why we picked it
1000A output starts gas engines up to 6.0L and diesel up to 3.0L
The NOCO Boost GB40 is the lithium jump pack that lives in glove boxes and shop drawers across r/BuyItForLife, r/MechanicAdvice, and overlanding communities. It delivers 1000 amps to start 12V gas engines up to 6.0L and diesels up to 3.0L, and NOCO's UltraSafe design adds spark proof connections and reverse polarity protection, so you can clamp it on without the usual jumper cable anxiety. Beyond starting, it doubles as a USB power bank and a 100 lumen LED flashlight with emergency modes. It holds a charge for up to a year between top ups, comes with a solid case, and is backed by a 1 year warranty. As a compact safety tool you buy once and keep in the vehicle, it earns its keep.
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Community & Review Summary
127,388 Amazon reviews
r/BuyItForLife satisfaction
Reddit posts (0 on r/BuyItForLife)
in Jump Starters
Price History
We began tracking this price on Jun 12, 2026. The chart fills in as more prices are recorded; see CamelCamelCamel below for older history.
Pros & Cons from Reviews
Pros
- +1000A output starts gas engines up to 6.0L and diesel up to 3.0L
- +UltraSafe spark-proof clamps and reverse-polarity protection
- +Doubles as a USB power bank and 100-lumen LED flashlight
- +Holds charge up to a year between recharges
- +Compact, rugged case for glove-box or trunk storage
- +Massive owner base and consistent recommendations on r/MechanicAdvice
Cons
- -1000A struggles with very large or deeply dead batteries
- -Lithium pack should be stored away from extreme heat
- -Needs periodic recharging to stay ready in an emergency
- -Clamp leads are short, so positioning can be awkward
Warranty & Returns
Warranty
1-year warranty
Return Policy
Most items are returnable within 30 days of receipt for a full refund. Some categories have shorter return windows.
Read full return policy