NOCO GB40 vs GB70 favors the NOCO Boost GB40 12V 1000A UltraSafe for most car and crossover owners because its 6.0L gas and 3.0L diesel rating covers common vehicles while keeping the pack lighter at 2.5 pounds. The NOCO Boost GB70: 2000A UltraSafe makes more sense for larger engines, diesel trucks, and buyers who want up to 40 starts per charge instead of up to 20.
Pros
- High 1000-amp peak rating for a compact 2.5-pound jump starter
- Stated compatibility with 12V vehicles and engines up to 6.0L gas or 3.0L diesel
- Built-in spark-proof and reverse-polarity protection
- Adds power-bank and flashlight functionality for emergency use
Cons
- The stated engine compatibility is limited to up to 6.0L gas and 3.0L diesel
- The listed warranty period is one year
Specifications
| Color | Gray |
|---|---|
| Size | 1000 Amps |
| Dimensions | 6.5748031429 x 3.149606296 x 7.7165354252 Inches |
| Weight | 2.4 Pounds |
| Product Group | Automotive Parts and Accessories |
| Binding | Automotive |
Best For / Avoid If
Best for buyers prioritizing
- High 1000-amp peak rating for a compact 2.5-pound jump starter
- Stated compatibility with 12V vehicles and engines up to 6.0L gas or 3.0L diesel
- Built-in spark-proof and reverse-polarity protection
Consider another option if
- The stated engine compatibility is limited to up to 6.0L gas and 3.0L diesel
- The listed warranty period is one year
Pros
- Supports a broad range of gas and diesel engine sizes
- Includes safety features designed to help prevent sparks and incorrect connections
- Combines jump-starting, emergency device charging, and flashlight functions
- Includes heavy-duty clamps, USB-C charging cable, and microfiber storage bag
Cons
- The listed recharge time is 6 hours
- At 5.0 lb, it may add noticeable weight to a glove box or emergency kit
Specifications
| Color | Gray |
|---|---|
| Size | 2000 Amps |
| Dimensions | 2.8 x 6 x 8.8 Inches |
| Weight | 5 pounds |
| Product Group | Automotive Parts and Accessories |
| Binding | Automotive |
Best For / Avoid If
Best for buyers prioritizing
- Supports a broad range of gas and diesel engine sizes
- Includes safety features designed to help prevent sparks and incorrect connections
- Combines jump-starting, emergency device charging, and flashlight functions
Consider another option if
- The listed recharge time is 6 hours
- At 5.0 lb, it may add noticeable weight to a glove box or emergency kit
Both products are portable lithium jump starters for 12V vehicles. Both use NOCO UltraSafe protection, include heavy duty clamps, provide a USB power bank, and carry a 1 year warranty. Their main split is starting headroom, supported engine size, weight, recharge time, and flashlight output.
| Feature | NOCO Boost GB40 12V 1000A UltraSafe | NOCO Boost GB70: 2000A UltraSafe |
|---|---|---|
| Vehicle system | 12V | 12V |
| Peak power | 1000 amps | 2000 amps |
| Gas engine rating | Up to 6.0L | Up to 8.0L |
| Diesel engine rating | Up to 3.0L | Up to 6.0L |
| Starts per charge | Up to 20 | Up to 40 |
| Recharge time | 3 hours | 6 hours |
| Weight | 2.5 pounds | 5.0 pounds |
| Flashlight output | 100 lumens | 400 lumens |
| Ingress protection | IP65 | IP65 |
Both are 12V products, so neither belongs with a vehicle using another electrical system. The engine ratings are the practical dividing line. A vehicle above the GB40 limits calls for the GB70, while a smaller vehicle gains little from carrying twice the weight unless extra starting capacity matters.
NOCO Boost GB40 12V 1000A UltraSafe
Best for ordinary cars, crossovers, and compact emergency kits
The GB40 is the easier choice for drivers with gas engines up to 6.0L or diesel engines up to 3.0L. Its 1000 amp peak output matches those limits, and its 2.5 pound form makes storage simpler in a glove box, console, or small roadside kit.
NOCO rates it for up to 20 starts per charge. That matters for a household with more than one vehicle, a car that sits for long periods, or an emergency kit shared across several trips. The figure is a manufacturer claim, not a promise for every battery condition. A severely damaged battery, poor cable contact, or extreme cold can affect any jump starter‘s result.
The smaller body also recharges in 3 hours. That shorter recharge window suits drivers who use the pack, return home, and want it ready again the same day. It still needs regular charge checks. A jump starter left in storage without maintenance may not help during an emergency.
UltraSafe protection adds spark proof and reverse polarity protection for 12V connections, according to NOCO. These features reduce connection mistakes, but they do not replace the vehicle manual or careful clamp placement. The clamps must connect to suitable battery terminals or approved jump points.
Its integrated 100 lumen LED includes seven modes, including SOS and strobe. That can help with a dark hood or roadside warning, though the GB70 produces four times the listed light output. The GB40 also works as a power bank for phones and tablets, giving the pack a second emergency role.
IP65 housing and rubberized over molding add protection against dust, water jets, and knocks within that rating. IP65 is not a license to submerge the unit. Store it dry, keep its ports closed when possible, and inspect cables before use.
Skip it if: your vehicle has a diesel engine above 3.0L, a gas engine above 6.0L, or your emergency plan covers larger trucks. The GB40’s lower engine rating leaves less room for those applications. Choose the GB70 instead, or select a unit with a manufacturer rating that matches your engine.
NOCO Boost GB70: 2000A UltraSafe
Best for large gas engines, diesel trucks, and repeated roadside use
The GB70 doubles the listed peak power to 2000 amps. Its stated range reaches gas engines up to 8.0L and diesel engines up to 6.0L, so it fits larger trucks and SUVs that exceed GB40 limits.
NOCO lists up to 40 starts per charge. That gives fleet drivers, rural motorists, and owners of multiple vehicles more reserve between charging sessions. It also helps when one pack may need to assist more than one vehicle during a trip. The rating remains tied to battery condition, temperature, connection quality, and vehicle requirements.
The tradeoff is physical burden. At 5.0 pounds, the GB70 weighs twice as much as the GB40. That difference matters if the pack lives in a small glove box, travels in a motorcycle bag, or moves between vehicles often. It is still portable, but it suits trunk storage better than compact carry.
Recharge time rises to 6 hours. Owners need a longer charging routine after use. That may be a minor issue for a home garage, but it matters for drivers who need rapid turnaround between several emergency calls.
The GB70’s 400 lumen LED is better suited to dark roadside work than the GB40’s 100 lumen light. Seven modes include SOS and strobe. The brighter lamp does not make roadside repairs safe by itself. Use hazard lights, reflective equipment, and a safe location away from traffic.
Like the GB40, the GB70 includes a USB power bank, spark proof protection, reverse polarity protection, IP65 housing, rubberized over molding, high conductivity clamps, and a 1 year warranty. Those shared features make the purchase decision less about basic functions and more about engine coverage and carrying cost.
Skip it if: you drive a smaller car within the GB40 range and want the lightest pack for occasional emergency use. The GB70 adds weight and doubles recharge time without a clear need for its larger engine rating or higher start count.
Engine Size Should Decide First
Start with fuel type and engine displacement. The GB40 supports up to 6.0L gas and 3.0L diesel engines. The GB70 reaches up to 8.0L gas and 6.0L diesel engines.
That distinction matters more for diesel owners. Diesel engines often place greater demands on starting equipment, and the stated diesel ceiling for the GB70 is twice the GB40’s ceiling. A diesel truck near or above 3.0L should not be treated like a typical sedan simply because both use 12V power.
Engine displacement is not the only factor in a jump start. Battery age, temperature, cable resistance, oil viscosity, and the vehicle’s electrical condition also affect the task. The manufacturer ratings provide a selection guide, not a guaranteed outcome in every failure.
Do not use either unit on a vehicle outside its stated 12V application. Follow vehicle and jump starter instructions for connection order. Stop if cables heat sharply, the battery case is damaged, or the vehicle shows signs of a larger electrical fault.
Portability, Charging, and Ownership Cost
The GB40 wins the carry decision. At 2.5 pounds, it takes less space and places less load on a small emergency kit. Its 3 hour recharge time also lowers the chance that a used unit sits empty for days.
The GB70 wins reserve capacity on paper. Up to 40 starts per charge doubles the GB40’s listed figure, and the larger engine range can prevent a mismatch for truck owners. Those benefits matter most when one pack serves multiple vehicles or when access to a wall outlet is limited.
Recharge time creates a simple ownership rule. GB40 owners can restore the pack during a shorter routine. GB70 owners should plan a six hour charging period after use. Neither product should be treated like a permanently charged tool without periodic inspection.
Both packs include a USB C charging cable and microfiber storage bag. Both add emergency phone power, so each can support a roadside kit beyond battery starting. Neither product is described here as a tire inflator or battery maintainer. Buyers needing air pressure support should consider a dedicated inflator, while stored vehicles may benefit from a battery maintainer. CarTechTalk’s jump starter and tire inflator guide covers that combined tool category.
Safety Features and Practical Limits
Spark proof and reverse polarity protection make connection errors less likely. They do not remove the need to identify positive and negative terminals. A protection circuit also cannot repair a failed alternator, shorted cable, frozen battery, or battery with physical damage.
IP65 protection supports use around dust and water spray. It does not support immersion. Keep the unit away from standing water, close its covers, and let wet equipment dry before charging.
High conductivity clamps support energy transfer between pack and vehicle. Clamp contact still matters. Corrosion, paint, loose terminals, or poor jump points can block current. Vehicle manuals may specify remote terminals instead of direct battery connections.
For a broader cold weather decision, see CarTechTalk’s winter emergency jump starter guide. Cold conditions can reduce battery performance and make a correct engine rating more important, but no portable pack should be treated as a substitute for a healthy vehicle battery.
Who Should Buy Neither
Do not buy either model if your vehicle does not use a 12V starting system, if its engine exceeds the listed GB70 limits, or if you need a built in tire inflator. A driver with a larger commercial diesel, specialized equipment, or a vehicle with unusual jump points should look for a unit whose manufacturer rating and connection instructions match that application.
Skip both if the real problem is repeated battery discharge at home. A battery maintainer may fit that ownership pattern better because it supports storage charging rather than emergency starting. See CarTechTalk’s battery maintainer guide for stored vehicles for that use case.
Final Verdict: GB40 or GB70?
Choose the NOCO Boost GB40 12V 1000A UltraSafe for most cars, crossovers, and smaller diesel vehicles within its 6.0L gas and 3.0L diesel limits. Its lower weight, faster 3 hour recharge, and compact storage make it the more practical everyday emergency pack.
Choose the NOCO Boost GB70: 2000A UltraSafe for larger gas engines, diesel trucks up to 6.0L, shared vehicle kits, and buyers who value up to 40 starts per charge. Its 400 lumen light adds value during dark roadside work, but the 5 pound body and 6 hour recharge demand more storage and charging discipline.
The right winner depends on engine size before any other feature. Buy the GB40 when its rating covers the vehicle and portability matters. Buy the GB70 when the vehicle or workload needs its higher listed capacity.
