NEXPOW G17 S40 Jump Starter 4000A Peak - Portable 12V Booster

In this review the NEXPOW G17 S40 jump starter is evaluated as a compact, multiuse emergency tool for drivers who want a reliable way to start gasoline cars and many diesel vehicles without waiting for help. The bottom line: this unit excels as a powerful, portable 12V booster with a very fast PD60W recharge option and an integrated 400 lumen LED, making it especially useful for motorists, RV owners and small-fleet operators who value speed and convenience in roadside situations.

Key Features

• 4000A peak current: The high peak current and forced start function give strong cranking power to start most gasoline engines quickly and tackle larger engines within the stated range.
• Wide engine compatibility: Rated to start all gasoline engines and diesel engines up to 10.0L, so it suits cars, trucks, ATVs and some marine or lawn equipment.
• PD60W two-way charging: The Type-C 60W input/output charges the unit from 0% to 100% in about 1.5 hours with a 60W adapter and can fast-charge phones and tablets on the go.
• 10 built-in protections: Upgraded smart chips and heavy-duty cables reduce the risk of misoperation, sparks, and provide safer connection to 12V batteries.
• Integrated LED light: A 400 lumen flashlight with steady, strobe and SOS modes helps with roadside visibility and emergencies at night.
• Portable kit included: The package includes smart jumper cables, Type-C cable(s), and an EVA storage box for tidy vehicle storage.

Who It's For

The G17 S40 is aimed at drivers who want a compact, powerful emergency starter and the ability to re-charge devices quickly; it is especially practical for owners of gasoline cars, SUVs, motorcycles, ATVs and many light trucks who value a fast recharge time and built-in light. It is also a good fit for weekend boaters or lawn equipment owners who need occasional portable power.

Shoppers who primarily need heavy-duty commercial diesel starts for very large engines should look elsewhere if they regularly service engines larger than 10.0L; some customers noted mixed results on diesel starts. If a unit with an included 60W wall charger is required, keep in mind the wall adapter is not supplied.

Pros & Cons

Pros

• Very strong 4000A peak current that starts gasoline engines quickly in cold or hot conditions.
• Fast PD60W two-way charging significantly reduces downtime between uses.
• Multipurpose design works as a power bank and includes a useful 400 lumen LED with SOS mode.
• Smart protections and heavy-duty cables make it safer and simple to use in roadside situations.

Cons

• Some customers report it is less consistent on larger diesel engines, so performance may vary near the upper 10.0L limit.
• The 60W charger is not included, so fast recharge requires buying a compatible adapter separately.

Specifications

Peak Current	4000A
Engine Compatibility	All gasoline; diesel up to 10.0L
Output/Input Port	Type-C PD 60W
LED Light	400 lumen (flashlight, strobe, SOS)
Operating Temperature	-4F to 140F
Included Accessories	Smart jumper cable, Type-C cable(s), EVA storage box, manual

Our Verdict

The NEXPOW G17 S40 is a well-rounded emergency jump starter that blends strong cranking power with modern charging convenience, making it a smart buy for most drivers who need a reliable 12V booster and portable power bank. It offers good value for those who want fast recharge and a built-in light, but buyers who regularly service very large diesel engines should test compatibility against their vehicles before relying on it.

Frequently Asked Questions

Will this start my truck?
The G17 S40 can start gasoline engines and diesel engines up to 10.0L; it works for many light trucks but very large diesel engines may be beyond its optimal range.

How fast does the jump starter charge?
With a 60W Type-C adapter (sold separately) the unit charges from 0% to 100% in about 1.5 hours using PD60W two-way charging.

Can it charge phones and tablets?
Yes, the Type-C PD60W output and QC3.0 USB port can quickly recharge smartphones, tablets and other small electronics.