

⚡ Power Up Anywhere, Anytime — Your Ultimate Roadside Lifesaver!
The YESPER 4120A Jump Starter is a professional-grade, portable 12V battery booster with a massive 26800mAh capacity and 4120 peak amps, capable of jump-starting all gasoline vehicles and diesel engines up to 10.0L. Featuring advanced DSLI IV intelligent control technology, multi-port charging options, and a rugged, compact design with an emergency LED flashlight, it ensures reliable, fast, and safe starts in extreme conditions. Perfect for millennials who demand convenience, power, and peace of mind on every journey.






| ASIN | B09Q15SPZJ |
| Amperage | 4120 Amps |
| Batteries | 1 Lithium Polymer batteries required. (included) |
| Best Sellers Rank | #59,495 in Automotive ( See Top 100 in Automotive ) #342 in Jump Starters |
| Brand | YESPER |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,203) |
| Date First Available | January 8, 2022 |
| Item Weight | 3.23 pounds |
| Item model number | YJS40 |
| Manufacturer | YESPER |
| Manufacturer Part Number | YESPER |
| Product Dimensions | 3.94 x 3.94 x 3.94 inches |
R**Y
Quality product
I had bought several of these for Christmas gifts after observing it's use on my daughter's car. Today some friends were having trouble starting their car to move it in time for the plow to come in. I grabbed one still in the box and it worked perfectly right out of the box and no charging. Impressive. Ordered a couple more today.
A**B
Heard from on Project farm's youtube - works great
Discovering this battery jump start pack through Project Farm's YouTube channel has been a game-changer. This compact yet powerful device lives up to its reputation, effortlessly jumping off my zero-turn mower and Chevy S10 without breaking a sweat. The convenience it offers, especially when dealing with unexpected dead batteries, is unparalleled. The ease of use is remarkable, making it a go-to solution for both my lawn equipment and my truck. It's a worthwhile investment for anyone seeking a reliable and efficient battery jump start pack that delivers on its promises. Overall, this device has earned its spot in my essential toolkit, providing peace of mind and quick solutions when I need them the most. Additionally, the build quality is impressive, giving a sense of durability and reliability. The compact design makes it easy to store in my vehicle without taking up much space. The pack's ability to jump-start both my zero-turn mower and Chevy S10 showcases its versatility, making it suitable for a range of vehicles. Considering its performance, user-friendly features, and the peace of mind it brings, this battery jump start pack is undoubtedly a valuable addition for anyone on the lookout for a dependable solution for unexpected dead batteries.
B**.
I won’t buy any other brand
Love this jump box. This is the 4th one I’ve purchased. 1 for me and 3 as gifts for others. The battery lasts awhile, the boost is helpful so suuuuper dead batteries. This thing will start just about anything. It also has a handy light and usb for charging. My only feedback would be to update the usb to a c charger. USBs were popular when I bought my first one of these things lol
E**I
Reliable jump box with good performance and solid value
This is a quality jump starter that has proven to be reliable in regular use. It does a good job overall, and I haven’t run into any issues starting vehicles with it. Battery life has been solid—I typically get around twenty jumps per charge, which is impressive for its size. That said, I still prefer the older jump boxes from a year or two ago that didn’t have voltage regulators built into the clamps, as they felt a bit more direct and predictable. Even so, this unit performs consistently and safely, and the built-in protections haven’t caused any problems in real-world use. The compact size, carry case, and additional features make it easy to keep in a vehicle at all times. It’s a great value for the money, especially considering how often it can be used on a single charge. Overall, this is a dependable jump box that does what it’s supposed to do. I like it enough that I keep one in every car.
J**W
Compact and Portable, great power output
The YESPER 4120A Peak Jump Starter is a powerful, reliable, and versatile tool that every driver should consider having in their car. Here’s my detailed review after using it: Pros: High Power Output: With a peak current of 4120A, this jump starter can handle even large vehicles like trucks and SUVs. It’s highly effective for starting dead batteries in seconds. Compact and Portable: Despite its impressive power, the device is surprisingly compact and lightweight, making it easy to store in your car or carry around. Versatile Functionality: In addition to jump-starting, the device doubles as a portable power bank. The USB ports are great for charging phones, tablets, and other devices on the go. Safety Features: The built-in safety features, including overcurrent, overvoltage, and short-circuit protection, ensure safe operation, even for users who aren’t mechanically inclined. LED Flashlight: The integrated flashlight with multiple modes (including SOS) adds extra utility, especially in emergencies or low-light conditions. Durable Build: The rugged casing is designed to withstand drops and tough conditions, making it suitable for outdoor and emergency use. Cons: Price: The YESPER Jump Starter is on the higher end of the price spectrum, but the performance and features justify the investment. Charging Time: It takes a few hours to fully charge the device, so it’s essential to keep it charged regularly for emergencies. Cable Length: The included jumper cables are slightly shorter than some users might prefer, which could be limiting in certain setups. Final Thoughts: The YESPER 4120A Peak Jump Starter is a must-have tool for anyone who wants peace of mind on the road. Its powerful performance, safety features, and additional functionalities make it worth every penny. Whether you’re dealing with a dead battery or just need a reliable power source on the go, this jump starter won’t let you down. Highly recommended for both personal and professional use.
D**G
Great device
Great product
S**N
Highly recommended
I love this thing I bought 3 of these for each of my cars . I bought all 3 at different times. I got all 3 for the price of one Noco battery jumper Don’t get me wrong the noco is the best . But this works amazing.
F**S
Fast, powerful and easy
Fast, easy jump of a dead battery. My car battery was so dead that it could not be jumped by another car. The representative from the road side assistance used this product to get my car going. I got the charger sent next day because I needed to jump the battery the next morning so I could drive to get a replacement battery. It can also be used to charge personal devices like phones and tablets. Highly recommended. Remember to charge after every jump.
Trustpilot
1 month ago
3 weeks ago