YESPER 4120A Jump Starter, 12V Car Battery Jumper Starter Portable (All Gas, up to 10.0L Diesel Engine), 26800mAh Battery Start Booster Pack, Jump Box with Carry Case, Jumper Cables, LED Light
Condition: New
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30-day refund / replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
20 left in stock
Arrives
Dec 1 – Dec 2
Size: 4120A
Features
- BATTERY BOOSTER JUMP STARTER - Rated at REAL 4120-amps, the YJS40 car battery jump starter can safely jump start all 12V vehicles(up to ALL gasoline and 10.0-liter diesel engines). It can achieve 60 times jump-start on a single charge and works even in extreme climates -4~140F. Even if the car voltage is too low or dead, pressing the BOOST button will force the car to restart
- 26800mAh BATTERY CAPACITY - Our YJS40 portable car jump starter has a true capacity of 26800mAh(99.16WH). Jump pack for car battery built-in USB(5V/2.4A), USB QC(5/9/12V) and Type-C(5V/3A) in/output ports. and a DC(15V/10A) port to power any DC devices, like a tire inflator, car vacuum cleaner, car refrigerator
- PORTABLE JUMP PACK - The size of our booster pack jump starter is 8.81in*3.53in*1.42in, weighs only 1.38 pounds, and is equipped with a Carry Case, which is not only very easy to carry but also convenient to store, so you dont have to worry about clutter anymore
- LED FLASHLIGHT - This car battery jump starter is equipped with 3 LED working light modes: flash light, strobe light and SOS light. This multi-function flashlight is perfect for camping, outdoor, indoor, travel and more, and can also help you in the dark or in emergency situations
- ADVANCED DESIGN - The new YJS40 series car starter jump box is made of fire-proof ABS material, which is more sturdy and durable for an adventurous life, and has multi-function (rain, dust, and drop resistance
- DSLI IV INTELLIGENT CONTROL TECHNOLOGY - YESPER YJS40 car jumper starter portable. Compared with the previous generation technology, the reassembly of the DSLI IV structure and microcomputer control program increases the voltage by 30% to 14.8V, and the starting current peak value is up to 4120A, achieving 1 second car start. The powerful intelligent temperature control technology reduces the starting temperature, helping you start faster, stronger and safer
- IN THE BOX - YJS40 Car Jump Starter, Heavy-Duty Jumper Clamps, USB to Type C Cable, Cigarette Lighter Adapter, Carrying case, User Manual. If you have any questions or concerns, please get in touch with us
Brand: YESPER
Product Dimensions: 8.82"D x 3.53"W x 1.72"H
Amperage: 4120 Amps
Peak Output Current: 4120 Amps
Manufacturer: YESPER
Manufacturer: YESPER
Brand: YESPER
Item Weight: 3.23 pounds
Product Dimensions: 3.94 x 3.94 x 3.94 inches
Item model number: YJS40
Batteries: 1 Lithium Polymer batteries required. (included)
Manufacturer Part Number: YESPER
Amperage: 4120 Amps
Date First Available: January 8, 2022
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Dec 1 – Dec 2
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Color: White
Love this. It works so well. I’ve had to use it several times. And this thing never fails to impress. Great buy. Quality item. Already had 3 family members order this after showing them its power. Great to keep on hand. Comes with nice case to keep everything organized and clean. Charges quick. Holds a charge for months. And jump starts cars in 5mins or less.
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Reviewed in the United States on July 13, 2025 by Rosemary Meza
Color: White
Whn you need a jump start this is what you need! Easy to use! Holds charge, works everytime.
Reviewed in the United States on September 9, 2025 by Joe Jitty
Color: White
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.
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Reviewed in the United States on November 22, 2023 by Alexander B
Color: White
I originally bought this after accidentally leaving my headlights on, draining my battery, and missing class because I had no jumper cables or backup plan. I ordered this with rush delivery—and it saved the day. But what impressed me even more came later…I completely forgot it was stored in the back of my truck for over a year. When I finally found it under the passenger seat, I assumed it would be dead. To my surprise, it still held nearly a full charge—after all that time! That level of power retention is rare and absolutely blew my mind. This charger is reliable, powerful enough for a 4x4 truck, simple to use, and perfect for both teens just learning to drive, and adults of any age who want peace of mind on the road. Whether you’re in an emergency or just want a smart backup, this product is a total game-changer.
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Reviewed in the United States on April 16, 2025 by CK
Color: White
I have tried the following Jump Starters and since most of the time I will be using it for charging devices my review is for how good the batteries are for charging mobile devices and how well they hold the charge. They are all over 2500A and do a good job with jump starting of my SUV. My recommendation: If you don't need voltmeter and digital display then any of the DBPower jump starters or Yester are good. If you need voltmeter then Mostools and Imazing are the best. Mostools M6 3000A - Looks high quality product with one of the thickest and biggest jump starter cables. - Takes less than 5 hours to charge - Good battery. Can charge over 3 Mobile phones - Plugging in phone automatically starts the jump starter and when done automatically powers off the jump starter. - Very powerful LED light. 2 separate power buttons for charging and LED lights. - Large Display and good case. - Contains Voltmeter to measure the battery level of Cars battery. However once charges the Jump Starter turns off and you cannot see after charge battery level. The manual says that when the output battery voltage is higher than Jump Starters battery voltage it turns off. - All the USB ports are 3A for fast charging which helps with quick charging your mobile devices. - Also the only one in the list which comes with charger. - 24 months warranty. Support is available through Seller messages to NCYJC. - Bad: Their phone no and emails on the user manual yield no response. There is no cigarette lighter adapter. YaberAuto 3000A - Small one and doesn't look high quality - Takes upto 6 hours to charge - Bad for charging. Only one mobile phones charging takes up 80% of the charge from the jump starter battery. - Need to start the jump starter to charge and need to remove the plugged in device to automatically stop it. - Average LED Light. Power and Lights are controlled from the same button with long press for lights. - Small display - Contains volt meter on the charging cable - 2.1 and 2.4 A USB ports only so no fast charging for latest mobile phones - No charger for the jump starter - 24 months warranty however there was no response to my questions/requests from their website. DBPower 2750 & 3000 - Very high quality and compact. The best looking in all I have reviewed. Jump starter cables are still better in Mostools - 5-7 hours to charge the jump starter battery - Good battery. Can charge about 3 Mobile phones (for 3000A over 3 mobile phones) - Need to turn power on to charge mobile device - Average LED lights. One power button for both LED and power. - No display and excellent case. - No Voltmeter - Fast charge available USB Ports. USBC in out and 1 USB fast charge port. One USB port at 2.1A - No charger for jump starter - 12-18 months warranty. Best customer service in this entire list. You can chat online from their website and they follow through to closure. The warranty varies by product so please check warranty. Buture 2500A - Average quality and everything is similar to YaberAuto hence not highlighting all the points. - Bad for charging. Only one mobile phones charging takes up 100% of the charge from the jump starter battery Yesper 4120A - Good quality. Although had plastic smell the most out of all in this list - Takes 8 hours to charge the jump starter - Good battery. Can charge over 3 Mobile phones. Plugging in phone automatically starts the jump starter and when done automatically stops the jump starter - Average LED lights. One power button for both LED and Power - No display and excellent case - No voltmeter - Fast charging available including USBC in/out at 3A - No charger for jump starter. Cigarette Lighter female cable available - 18 months warranty. No response for my queries from Yesper site Imazing IM29 from Costco - Good quality however a bit expensive compared to all the above - Over 5 hours to charge the jump starter - Good battery. Can charge upto 3 mobile phones. Need to start the jump starter to charge the mobile device. - Average LED Lights. One power button for both - Display available and excellent case - Some reviews say that voltmeter exists however the one I purchased didn't have voltmeter on the cable - Fast charge available USB Ports. USBC in out and 1 USB fast charge port. One USB port at 2.1A - No charger for jump starter. Cigarette Lighter female cable available - 24 months warranty. No response from support which is why I returned this product
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Reviewed in the United States on March 9, 2024 by Swapnil Rupji