AstroAI S8 Ultra 12V 4000A Lithium Jump Starter

The AstroAI S8 Ultra is a 12V lithium jump starter listed with 4000A peak output and support for gasoline engines and diesel engines up to 12L. Its compact jump-pack design also includes a flashlight and USB charging ports, while the listing gives differing weight and capacity-related details that buyers should review.

At a glance

The listing claims 4000A peak current and support for all gasoline engines and diesel engines up to 12L.
Smart jumper cables have indicator lights and the listing describes ten safety features, including spark-proof and reverse-polarity protection.
The built-in flashlight has lighting, strobe and SOS modes. The listing claims up to 80 hours of runtime.
USB-C and two USB-A ports allow the unit to serve as a power bank.
A storage bag is listed as included. The wall charger is explicitly not included.

Price

$72.18Save 48%

Reference price: ~~$139.99~~

Price checked: Nov 12, 2026

View offer

Often bought together

AstroAI S8 Ultra 12V 4000A Lithium Jump Starter Up to All Gas/12L Diesel | Heavy-duty Battery Booster with Smart Jumper Cable

$59.97

Pros and cons

Pros

Combines jump-starting, a three-mode flashlight and USB device charging in one portable unit.
Smart cable indicator lights are intended to help users identify connection or jump-start issues.
The storage bag provides a place to keep the unit's accessories together.

Cons

The wall charger is not included, so charging the jump starter requires a separately available charger or another suitable power source.

Technical specifications

9 specifications

Identity
Brand	AstroAI
Model	S8 Ultra

Power and battery
Battery type	Lithium Polymer
Voltage	12 volts
Battery capacity	16000 milliamp_hours
Peak output current	4000 A

Compatibility
Listed vehicle types	ATV, Lawn Mower, Motorcycle, Passenger Car, RV, Snowmobile, Truck, UTV

Dimensions and installation
Weight listed	1.8 pounds

Protection and lighting
Ingress protection rating	IP65

What to know before buying

Listing details to confirm

The listing is inconsistent about weight, giving 1.8 pounds in product details and 1.79 lb in feature text. Its stated 4000A peak output and engine compatibility are manufacturer claims, not independently verified performance. Fully charge before first use, recharge at least every three months during extended storage, and observe the listed temperature limits: -4°F to 122°F for operating and storage, and 32°F to 113°F for charging.

Who is it for?

A good fit for

Drivers who want a portable jump starter with a flashlight and USB-A and USB-C charging ports.
Owners of listed 12V vehicle types who want a jump pack rated by the listing for gasoline and up to 12L diesel engines.

Less suited to

Buyers who need a wall charger included in the box.
Anyone who needs independently verified jump-start performance or a confirmed weight specification.

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

Customer reviews on Amazon

4.6 / 5 · 1,632 ratings

5 stars82%82%
4 stars9%9%
3 stars4%4%
2 stars1%1%
1 star4%4%

Customer feedback highlights reported ease of use, compactness, sturdy construction, battery life and successful vehicle starts. Those impressions may matter to drivers looking for a portable emergency pack, but individual reported results do not establish performance for every vehicle. Overall ratings skew strongly positive, while a smaller share of ratings are low, so experiences are not uniformly favorable.

Positive themes

Customers report successful starts and describe the unit as easy to use.
Feedback mentions compact size, perceived durability and battery life, including a report of multiple starts between charges.

Frequently asked questions

What vehicles is the AstroAI S8 Ultra listed for?

The product details name ATVs, lawn mowers, motorcycles, passenger cars, RVs, snowmobiles, trucks and UTVs. The feature text also claims compatibility with all gasoline engines and diesel engines up to 12L.

Can it charge phones or other devices?

Yes. The listing describes one USB-C port and two USB-A ports for charging devices.

Does the package include a wall charger?

No. The feature text explicitly says the wall charger is not included.

What should I know before storing or charging it?

The listing advises fully charging before first use and recharging at least every three months during long storage. It gives operating and storage temperatures of -4°F to 122°F and a charging range of 32°F to 113°F.