AstroAI S8 Ultra 4000A Car Jump Starter, Jump Box up to All Gas Engines & 12L Diesel, 12V Portable Power Bank with USB/Type-C Ports, 3 Modes LED Flashlight, Auto Battery Booster with Jumper Cable

Excellent now and the charge lasts a long time I can start many vehicles I recommend it 10 out of 10

This booster works great have jump started anything from a lawn tractor to pick up truck fast shipping great price good quality fast shipping

Works great! Jumped a neighbor’s dead battery quickly. Just make sure it’s charged and ready.

I bought two of these. A quick, low-cost, easy to use, alternative for jump-starting a car without the need for jumper cables or another vehicle to help you. Just hook it up to the battery similar to jumper cables. Wait for the power light, start the car. Nice power boost for a weak battery. I bought my first one a year ago and it is still very durable. Charges similar to a phone charger so easy to charge if you lose the charging line.

Only used once but it was easy and worked well. Highly recommend

I bought it to run my electric paddle board pump remotely - so I don't have to stand by the car in the 100 degree parking lot to blow up the iSUP. It does NOT work for this as it either outputs more or less than 12 volts with the 12 volt adapter. (Air pump gave me an error signal due to voltage) I was quite upset about this. I was able to get it to work by plugging in my 12 volt to 120 W adapter (that I use in the car) into the battery 12 volt adapter, into the battery, then plug the air pump into that. My engineer husband said this wasn't a great idea, so don't try that at home evidently. However, we can get several phone charges off of it, makes it great for camping / any time you don't have easy access to power or can't run a cord where you need. The fast charger is indeed fast for charging up a phone!

Better than waiting for a truck (or neighbor) to give you a jump start. Glad to have it for emergency (or when returning from a long trip).

I picked up the AstroAI S8 Ultra 4000A Jump Starter as a backup for my vehicle, and after a few weeks of testing it out, here’s what stood out: Performance: • This thing has serious muscle. I helped a stranded motorist with 5.3L V8 truck battery that was completely dead, and it didn’t hesitate. On paper, it’s rated for all gas engines and up to 12L diesel—and based on the kick it gave my truck, I believe it. • The jumper cables feel sturdy, with good clamping force and no noticeable heat build-up even after multiple test jumps. Design & Build: • Compact enough to store in a glove box or center console. It doesn’t feel cheap like big box stores jump packs, and the rubberized edges give some drop protection. • The LED light is bright enough for roadside use—think emergency hazard light or just finding your way under the hood at night. Battery & Ports: • The 24,000mAh capacity isn’t just for jump starts. I used it to recharge my phone, tablet, and even a laptop via the USB-C port. It supports fast charging, which is a plus if you’re out camping or on the road. • Having a DC output is handy if you need to power 12V accessories. Ease of Use: • Straightforward—plug in the jumper cables, connect, and press. The safety system warns you of incorrect polarity, which is a big deal for people who aren’t mechanically inclined. What I Liked Most: • Strong jump-starting ability (even on bigger engines). • Multi-use battery pack—basically a power bank + jump starter in one. • Solid build, portable size. What Could Be Better: • The carrying bag is functional but hard case would be better • The instruction manual is basic. A more detailed guide or QR link to a video would help first-time users. Add-on to consider for this is a 60w folding solar panel so you will never run out power TDLR: If you want peace of mind on the road, the AstroAI S8 Ultra is a smart buy. It’s not just a jump starter—it doubles as a reliable travel power bank. For the price, the features and raw power make it an excellent value.

ممتاز آداء وجودة ومتانة ، يشغل السيارة مرتاح.

Buen producto, entregado a tiempo. Buena calidad.

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.

This is good value for money. Works well. Can charge a usb item and has a torch. Sturdy and easy to use

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.