NOCO GB40 vs GB70: which one do you need?

Get the GB40 ($99.95) for most 4-cylinder and V6 cars. Get the GB70 ($139.99) for a V8 truck or SUV, or a diesel up to about 4 L. The GB70 has twice the starts per charge, but it's bigger and heavier.*1–3

By Pacific Parts Department editors · Published · Ratings from NOCO's own spec pages

Which to get

For 4-cylinder and V6 cars

Right size for most drivers, and lighter

NOCO Boost Plus GB40

Rated 6 L gas · 3 L diesel · 2.45 lb

$99.95 on Amazon

Check price on Amazon

For V8s and small diesels

More engine, more starts per charge

NOCO Boost HD GB70

Rated 8 L gas · 6 L diesel · 4.18 lb

$139.99 on Amazon

Check price on Amazon

Prices on Amazon, October 26, 2026. Ratings and weights are NOCO's own.*3

The GB40 is the right size for most drivers

  1. It covers your engine with room to spare. NOCO rates it for gas engines up to 6 L. Most 4-cylinders and V6s are 4 L or less, so you keep the extra 2 L we suggest for freezing mornings. A bigger V6, like GM's 4.3 L, gets the GB70.*1
  2. It's smaller and lighter. 2.45 lb against 4.18 lb on NOCO's spec pages (NOCO's GB70 guide says 5 lb), so it fits in a glovebox, where it's easy to grab.*4–6
  3. It costs $40.04 less on Amazon today.*3

What owners report

The most common praise and complaints from owner reviews on Amazon, retailer sites, forums and Reddit. Sources are listed at the end.

NOCO Boost Plus GB40

  • Owners say it starts cars and small trucks right away, and several have jumped dozens of vehicles with it.*12–14
  • Many say it holds its charge for a long time between uses.*12, 15
  • It can struggle with a V8 or a battery that is fully drained. A Ram forum owner says "It struggles to turn over a V8."*12, 16
  • Some Amazon reviewers say their unit stopped recharging or died within a year.*12

NOCO Boost HD GB70

  • Owners say it starts V8s and diesel trucks, including in the cold. One Reddit owner says it started his 6.0 Powerstroke "more than a few times in the cold."*16–18
  • Several say it keeps most of its charge for months. A Ram forum owner says it "holds down to ~75% after a year."*19, 20
  • Some owners say it wouldn't start a dead battery, or failed within months. One forum owner says it may not jump a car once its own charge drops below about 75%.*17, 21
  • Some Amazon reviewers call it overpriced.*17

When to get the GB70 instead

You drive a V8. A 5.0 to 5.7 L V8 plus our 2 L cold margin needs about 7.7 L. The GB70 is rated for 8 L; the GB40's 6 L covers the engine only on mild days.*2

You drive a diesel. The GB40 is rated for diesels up to 3 L, with nothing to spare on a 3 L diesel. The GB70 is rated for 6 L. For a 6.7 L heavy-duty diesel, see our diesel truck pick.

You want more starts between charges. NOCO's Amazon listings say up to 40 starts per charge for the GB70 against 20 for the GB40, from a 56 Wh battery against 24 Wh.

You'll use the flashlight. The GB70's is 400 lumens; the GB40's is 100.

One price note: Amazon has the GB70 at $139.99, while NOCO's own site lists it at $199.95.*2, 3

Why some people pick the GBX45 instead

NOCO's GBX45 ($124.95) sits between the two: rated for 6.5 L gas and 4 L diesel. It recharges in about 48 minutes over USB-C and can charge a laptop at 60 watts.*7

The trade-off: its Amazon listing says up to 6 jump starts per charge, against 20 for the GB40. If you mainly want a jump starter that's ready after months in the glovebox, the GB40 is the safer pick. If you'd also use it as a fast laptop charger, the GBX45 makes sense.

GB40 vs GB70 vs GBX45, side by side

GB40GB70GBX45
Gas engine rating6 L8 L6.5 L
Diesel engine rating3 L6 L4 L
Peak amps (box)1,000 A2,000 A1,250 A
Battery24 Wh56 Wh31 Wh
Starts per chargeUp to 20Up to 40Up to 6d
Recharge timeAbout 3 hours4.5 to 6 hoursaAbout 48 minutes
Weight2.45 lb4.18 lbb2.16 lbc
Flashlight100 lumens400 lumens100 lumens
Price on Amazon$99.95$139.99$124.95
  1. a NOCO's support page says 4.5 hours at 2 A; the Amazon listing says 6 hours.*8
  2. b NOCO's GB70 user guide says 5 lb.*6
  3. c NOCO's GBX45 user guide says 1.3 lb.*9, 10
  4. d From the Amazon listing; NOCO's site doesn't state it.*11

Source: NOCO spec pages and Amazon listings, read October 24, 2026*1–3, 7

Not sure what engine you have? Find your size by engine or VIN.

Questions people ask

Is the NOCO GB40 enough for a V8?
It is rated for gas engines up to 6 L, which covers a 5.0 to 5.7 L V8 on paper. It leaves no room for cold mornings, so for a V8 we pick the GB70.
Can the GB40 jump a diesel?
NOCO rates it for diesels up to 3 L, with no room to spare on a 3 L diesel. For a diesel up to about 4 L we pick the GB70 (6 L diesel). A 6.6 or 6.7 L truck diesel needs the GB150 or bigger.
How many jump starts do you get per charge?
NOCO's Amazon listings say up to 20 for the GB40 and 40 for the GB70.
Is the GB70 worth the extra money?
Only if you need its bigger rating (a V8, a big V6 or a small diesel) or the extra starts. For a 4-cylinder or V6, the GB40 does the job for $40.04 less.

Review log

  • Prices and stock checked on Amazon October 26, 2026.
  • : Published

Notes and sources

  • Ratings, starts, recharge times and weights are NOCO's own, from its spec pages and Amazon listings, read October 24, 2026.
  • The extra 2 L for freezing weather is our margin, explained on what size jump starter do I need.
  • Product photos come from Amazon.
  1. NOCO Boost Plus GB40: NOCO spec page · NOCO page · Amazon listing, read October 24, 2026.
  2. NOCO Boost HD GB70: NOCO spec page · NOCO page · Amazon listing, read October 24, 2026.
  3. Prices and sellers: Amazon, read October 26, 2026. Units: Amazon's "bought in past month" on each listing, October 24, 2026.
  4. NOCO spec page, read October 24, 2026.
  5. NOCO spec page, read October 24, 2026.
  6. NOCO user manual, read October 24, 2026.
  7. NOCO Boost X GBX45: NOCO spec page · NOCO page · Amazon listing, read October 24, 2026.
  8. NOCO support page, read October 24, 2026.
  9. NOCO spec page, read October 24, 2026.
  10. NOCO user manual, read October 24, 2026.
  11. Amazon listing, read October 24, 2026.
  12. NOCO Boost Plus GB40: Amazon listing, "Customers say" summary, which Amazon writes from its customer reviews (130,249 ratings), read October 25, 2026.
  13. The Garage Journal forum, "NOCO jump boxes," owner posts, posted December 2024, read October 25, 2026.
  14. Overland Bound forum, "NOCO GB-40 battery jumper," owner posts, posted January to May 2017, read October 25, 2026.
  15. Reddit r/preppers, owner comment, posted January 6, 2023, read October 25, 2026.
  16. 5thGenRams forum (Ram trucks), owner posts, posted September to October 2023, read October 25, 2026.
  17. NOCO Boost HD GB70: Amazon listing, "Customers say" summary, which Amazon writes from its customer reviews (31,123 ratings), read October 25, 2026.
  18. Reddit r/VEDC, owner comment, posted June 30, 2023, read October 25, 2026.
  19. 5thGenRams forum, "Does anyone carry a jumpstart pack?," owner posts, posted December 2022, read October 25, 2026.
  20. Reddit r/VEDC, owner comment, posted September 7, 2021, read October 25, 2026.
  21. The Garage Journal forum, "NOCO battery jumpers," owner posts, posted November 3, 2019, read October 25, 2026.