










⚡ Never get stranded again — power up like a pro with AstroAI S8 Ultra!
The AstroAI S8 Ultra is a powerhouse 4000A jump starter designed for professional-grade reliability, capable of jump-starting large petrol and diesel engines. Featuring a massive 24000mAh battery, it doubles as a versatile power bank with multiple fast-charging ports. Its smart jumper cables and 10-layer safety system guarantee safe, intuitive operation, while the IP65-rated rugged design ensures durability in any environment. Compact yet robust, it’s the ultimate essential for millennial managers who demand readiness and efficiency on the road.











| ASIN | B0CB3W9FRD |
| Amperage | 4000 Amps |
| Automotive Fit Type | Universal Fit |
| Battery Capacity | 24000 Milliamp Hours |
| Best Sellers Rank | 80,419 in Automotive ( See Top 100 in Automotive ) 258 in Car Battery Jump Starters |
| Brand Name | AstroAI |
| Compatible with Vehicle Type | Automotive |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,083) |
| Included Components | Pack with Beautiful Giftbox, S8 Ultra Jump Starter 4000A, Smart Jump Leads, Storage Bag, User Manual and Warranty Card, USB C Cable and Cigarette Adaptor |
| Item Dimensions D x W x H | 13D x 26W x 3H centimetres |
| Item Type Name | jump starter |
| Item Weight | 1.79 Pounds |
| Manufacturer | AstroAI |
| Manufacturer Part Number | S8 Ultra |
| Manufacturer Warranty Description | 2 Year |
| Model Number | S8 Ultra |
| Peak Output Current | 4000 Amps |
| Specification Met | IP65 |
| Voltage | 12 Volts |
| battery-cell-composition | Lithium Ion |
A**R
Great value for money
This is good value for money. Works well. Can charge a usb item and has a torch. Sturdy and easy to use
M**L
It works!
Bought this as my Land Rover with a 2.5 turbo diesel engine had a flat battery, slightly turned the engine over, but not enough. I tried jumping it with another car and it still wouldn't start. It was away from my house so couldn't run the battery charger to it. So power jumper pack required. There are many on the market so it was what's best value for money, this was being sold for £37.99, an excellent price and mid power range. I was a little skeptical to be honest about it, but it started the engine first time. It did require charging when delivered, I did this over night . It dropped one bar after starting the engine, out of 4 bars, but would of done a few more starts I'm sure. I will keep it in my Landy just in case and keep it charged of course. It saved me having to call out recovery so I'm very happy with it, best purchase for many a month.
O**R
Perfect for peace of mind
**Purchased the item whilst it was on discount for £39.99** The AstroAI S8 Ultra is the perfect tool to carry within your vehicle. The jump pack is incredibly compact, comes with helpful built in features such as a torch, ability to charge phones and a cigarette lighter attachment as well as the obvious boost/jump attachment. Another helpful feature is it will tell you whether you have the leads the right way around when attached to the battery. It’s really well designed, incredibly strong (have dropped it several times with no issue, merely a scratch on it) and very easy to use to start up dead vehicles. Since purchasing the item, about 8 months ago I have only charged it once - during this time, I have boosted and then jumped 4 different vehicles and still have over 50% charge remaining. Highly recommend purchasing this item, it is perfect to keep in your car for peace of mind and offers great value for money.
G**3
Worked well
I read instructions and charged as specified ready for use. On first try worked very well and easy to use. Started the car no problem and still has plenty of charge to repeat a good few times yet. Impressed so far
G**S
AstroAI S8 Ultra 4000A Jump Starter Power Pack
So far, would say good value and does what it says? (I have only used it to jump-start small car engines) the only complaint is the slow charging, but I hope it continues to work for many a year.
S**A
AstroA1 S8 4000A Jump Starter
Bought this for my husband, he had to use it the other morning when it was frosty. Started his car straight away. Good value for money and small enough to keep in the glovebox.
R**S
4 months in review, 10/10
4 month later review 10/10, honestly. It’s started my Nissan 370z 3.7L countless times, my dads massive Luton van and other cars and I’ve charged this around 5 times in the 4 months I’ve had it, absolutely over the moon with it, it’s 1am I can’t sleep and it’s that good I wanted too try let people know because I was struggling too trust many of these Amazon ones in December and was going too go for one of the big brand ones and tbf I’m glad I didn’t!
K**E
It's great to know you have a way of starting car if now one to help you to push
As it looks small it is compact and u can live it in car out of the way till u need it just make sure you keep it well chard up great thing to have
I**M
ممتاز آداء وجودة ومتانة ، يشغل السيارة مرتاح.
G**A
Buen producto, entregado a tiempo. Buena calidad.
A**A
This jumper starter is really handy to have. It’s strong enough to start a car without any issues, and the 24000 mAh power bank with QC3.0 keeps phones and other devices charged on the go. Easy to use and feels solid in the hand. Definitely one of those tools you don’t think about until you need it — then you’re glad it’s there.
M**S
This booster works great have jump started anything from a lawn tractor to pick up truck fast shipping great price good quality fast shipping
K**G
Not only I bought one, but two of this product, and it's amazing. I bought my first one back in 2023 - 2024 and I play/deal around cars a lot, and this is one of the best products I use, it's small, and charges big engines. I tried this on Hellcats, 6.4 V8, 6.2 Supercharged V8, 5.5 V8, 5.0 Supercharged V8. I once even jumpstarted 5 different cars that were all V8 in one go, and there was still 50 - 75% battery left. Definitely recommended.
Trustpilot
1 week ago
2 weeks ago