The number on the box is not the whole story
We check jump starter and battery charger claims against the maker's own spec sheet and the public safety directory, then show you both, with the date we looked.
Some Amazon listing titles say
8000A
A peak-amp figure. And peak amps are not governed by a universal testing standard, as one jump starter maker puts it.
NOCO's GB150 spec sheet says
3000A
Plus what matters more: gas engines to 9.0 L, diesel to 7.0 L, an 88 Wh battery, and a UL 2743 listing we can link to. Full record.
Charge time estimate
Based on NOCO's published charge-time tables. See the math and the tables.
Jump starters by engine size
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NOCO Boost Plus GB40 Gas 6.0 L, diesel 3.0 L 1,000 A peak, 24 Wh -
NOCO Boost X GBX45 Gas 6.5 L, diesel 4.0 L 1,250 A peak, 31 Wh -
NOCO Boost HD GB70 Gas 8.0 L, diesel 6.0 L 2,000 A peak, 56 Wh -
NOCO Boost X GBX155 Gas 10.0 L, diesel 8.0 L 4,250 A peak, 99 Wh
All eight, sorted by engine rating
What we found when we checked
- 4,000A3,000A
NOCO lists the GB150 at 3,000 A today. Older reviews in search results still say 4,000 A. See the record.
- 800 mA1 A
The Battery Tender Junior Multi-Chemistry is sold on Amazon as 800 mA. Its maker lists 1 A. See the record.
- 5.0 lb4.18 lb
One NOCO page gives two weights for the GB70: 5.0 lb in the overview, 4.18 lb in the spec table. See the record.
- ULETL
The GB40 data sheet carries the ETL mark from Intertek, which lists it to the UL 2743 standard. See the record.
Start with your question
- How long will my battery take to charge?
The calculator above, with the NOCO tables it comes from.
- Which jump starter fits my engine?
Eight NOCO models sorted by gas and diesel engine rating.
- Which charger for my battery?
Chargers by current and the largest battery each recharges.
- Is this jump starter safety listed?
What we found in the public Intertek directory, and how to check yourself.
- How do I use my jump starter?
NOCO's four steps and what every light means.
- Why is my charger light red?
Every NOCO GENIUS charge and error light, explained.
- What does "peak amps" mean?
Why a bigger number on the box is not a bigger engine rating.
- Which of these two models?
Head-to-head tables: GB40 vs GBX45, GENIUS1 vs GENIUS2 and more.
Questions people ask
Where do your numbers come from?
Ratings come from the manufacturer's own spec page, safety listings from the public Intertek directory, and charge times from NOCO's published tables. Every page shows the date we checked.
Do you test the products?
No. We compare published ratings and public safety records, and we say so on every page. We do not publish star ratings or prices.
How do I pick a jump starter?
By the engine rating in liters, gas and diesel separately, not by peak amps. Choose the smallest model rated at or above your engine.
How long does a car battery take to charge?
About 7.5 hours for a 50 Ah battery at half charge on a 5 amp charger, using NOCO's charge-time ratio. The calculator works it out for your battery.
What we do and do not do
Every spec on this site links to the manufacturer page it came from and carries the date we read it. Every safety listing links to its record in the Intertek directory. When a maker's own pages disagree with each other, or a listing disagrees with the maker, we show both numbers instead of picking the flattering one.
We do not test products in a lab or a driveway, and we do not publish star ratings. How we check explains the process and its limits.