AstroAI S8 Ultra 4000A 12V Lithium Jump Starter

The AstroAI S8 Ultra is a 12V lithium jump starter listed with 4000A peak current and compatibility claims for all gas engines and up to 12L diesel. It also serves as a USB power bank and includes a three-mode LED flashlight, while the listed specifications and feature copy differ on the unit’s dimensions and weight.

At a glance

Advertised 4000A peak current and compatibility with all gas engines and up to 12L diesel. These are listing claims, not independently verified performance results.
Functions as a power bank with one USB-C and two USB-A ports. The listing says the wall charger is not included.
Built-in 300-lumen flashlight has Lighting, Strobe, and SOS modes, with an 80-hour runtime claim.
Smart jumper cables are described as including spark-proof and reverse-polarity protection.

Price

$72.17Save 48%

Reference price: ~~$139.99~~

Price checked: Nov 14, 2026

View offer

Pros and cons

Pros

Combines a jump starter, three-mode flashlight, and three USB charging ports in one unit.
The feature copy describes automatic battery-voltage analysis and indicator lights on the jumper clamps.
Customer feedback reports successful starts, easy operation, and portability.

Cons

A wall charger is not included, so charging the unit requires a suitable charger or another power source.

Technical specifications

18 specifications

Identity
Brand	AstroAI
Model	S8 Ultra

Power and battery
Battery type	Lithium Ion
Voltage	12 volts
Capacity	16000 milliamp_hours
Listed amperage	4000 A

Dimensions and weight
Dimensions listed in product details	5.24"D x 10.31"W x 4.29"H
Weight listed in product details	2.1 pounds

Jump-starting claims
Engine compatibility stated in title	Up to All Gas/12L Diesel
Peak current and discharge rate stated in feature copy	4000A peak current and a 45C discharge rate
Claimed charge-cycle life	1000+ charge cycles
Claimed operating and storage temperature range	-4°F to 122°F
Charging temperature range	32°F to 113°F

Connections and lighting
USB ports	1 USB-C port and 2 USB-A ports
Flashlight	300-lumen flashlight with 3 modes: Lighting, Strobe, and SOS — 80-Hour Runtime

Cables and protection
Cable length and thickness	18.5 inches long, 0.24 inches thick
Ingress protection claim	IP65-rated
Safety features	10 comprehensive safeties

What to know before buying

Listing details to confirm

The supplied product details list a substantially larger size and higher weight than the feature copy, making the actual carry dimensions unclear. The listing is inconsistent about size and weight. Product details give 5.24"D x 10.31"W x 4.29"H and 2.1 pounds, while feature copy gives 8.94 x 3.82 x 1.42 in and 1.79 lb. Its title and feature copy claim support for up to 12L diesel, but the listed engine claim is not independently confirmed. Check the selected listing for the exact configuration.

Who is it for?

A good fit for

Drivers who want a portable jump starter with USB charging and a built-in emergency flashlight.
Buyers seeking a listed 12V unit with claims covering gas engines and up to 12L diesel, subject to confirming suitability for their vehicle.

Less suited to

Buyers who need a wall charger included.
Buyers who require confirmed physical dimensions or independently verified engine compatibility before purchase.

AstroAI S8 Ultra 4000A 12V Lithium Jump Starter · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 1,634 ratings

5 stars83%83%
4 stars9%9%
3 stars3%3%
2 stars1%1%
1 star4%4%

Customer feedback highlights successful vehicle starts, perceived battery endurance, ease of use, portability, and build quality. Some accounts describe multiple starts between charges, but these are individual reports rather than a guaranteed result. Those impressions are relevant to its advertised jump-start and portable power-bank role, though they do not settle the listing’s conflicting size and weight figures or confirm compatibility with a particular engine.

Positive themes

Customer feedback reports successful starts, perceived battery endurance, and straightforward operation.
Feedback also describes the unit as portable and solidly built.

Frequently asked questions

What vehicles does the AstroAI S8 Ultra claim to support?

The title and feature copy claim compatibility with all gas engines and up to 12L diesel, as well as 12V vehicles. Confirm the selected listing and your vehicle’s requirements before relying on that claim.

Can it charge phones or other devices?

The listing describes one USB-C port and two USB-A ports for charging devices. It says a wall charger is not included.

What is unclear about the listed size and weight?

Product details list 5.24"D x 10.31"W x 4.29"H and 2.1 pounds, while feature copy lists 8.94 x 3.82 x 1.42 in and 1.79 lb. The listing does not resolve this discrepancy.

What care does the listing recommend?

It recommends fully charging the unit before first use and recharging at least every three months during long storage. The stated operating and storage range is -4°F to 122°F, and charging is stated as 32°F to 113°F.