YESPER Car Jump Starter- 4120A Peak Portable Car Starter (All Gas, up to 10.0L Diesel Engine) with Booster, 12V Jump Box Jump Pack with Carry Case& DSLI Safe Tech
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
Tuesday, Jan 13
Size: 4120A
Features
- [BOOSTER JUMP STARTER]- Rated at REAL 4120-amps, the YJS40 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
- [DSLI IV INTELLIGENT CONTROL TECH]- Compared with the previous technology, DSLI IV reassembling of the structure and microcomputer control program, the voltage is increased by 30% up to 14.8V, the peak current of the starting current reaches 4120A thus reaching 1 second Start the car, the powerful intelligent temperature control technology reduces the starting temperature; helps you start faster, stronger and safer
- [ACCURATE CAPACITY]- We do not exaggerate the capacity of our product. Our YJS40 jump starter has a true capacity of 26800mAh(99.16WH)
- [VERSATILE CHARGING OPTIONS]- Jump pack 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, etc
- [LED FLASHLIGHT]- The LED work light has 3 modes: Flash Light, Strobe Light, and SOS Light. This multi-purpose flashlight is great for camping, outdoors, indoors, travel, etc, and helps you in the dark or emergencies
- [Advanced Design]- The new YJS series jump starters are made of fire-proof ABS material, which is more sturdy and durable for an adventurous life, and have multi-function (rain, dust, and drop resistance
- [WHAT YOU GET]- 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
Item Weight: 2 Pounds
Amperage: 4120 Amps
Peak Output Current: 4120 Amps
Brand: YESPER
Product Dimensions: 8.82"D x 3.53"W x 1.72"H
Item Weight: 2 Pounds
Amperage: 4120 Amps
Peak Output Current: 4120 Amps
Manufacturer: YESPER
Item Weight: 2 pounds
Item model number: YJS40
Batteries: 1 Lithium Polymer batteries required. (included)
Manufacturer Part Number: YESPER
Date First Available: January 8, 2022
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Jan 13
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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- Financing through Apple Pay
Learn more about financing & leasing here.
Similar Products
Top Amazon Reviews
Size: 4120A
Why did you pick this product vs others?: I had left just a star review, but after jumping a DIESEL I figured I could at least say this thing is a beast! Buying another for my wife's car, and probably a couple more as gifts in the near future.
Reviewed in the United States on June 19, 2025 by Man in MN
Size: 4120A-B
Purchased this as a gift for my brother and after so long, he is finally using it as his car battery needs to be replaced.
Reviewed in the United States on June 22, 2025 by EsQueue
Size: 4120A
What a great piece of Kit. Saved me on multiple occasions with totally flat batteries. I did need to push the boost button on one of the times and it worked like a charm. After several jumps it still showed mostly charged. Charge does not degrade after several months. Happy with my purchase.
Reviewed in the United States on June 2, 2025 by Frank
Size: 4120A
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
Size: 4120A
An item you need but hopefully never need to use, but I actually did need it, worked great, fantastic product
Reviewed in the United States on June 21, 2025 by Willie
Size: 4120A-B
This device has worked several times for me. It's easy to use and seems to be quality. Would purchase again.
Reviewed in the United States on June 19, 2025 by SSS
Size: 4120A
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
Size: 4120A-B
Works great, much easier to help people and can even use ro charge things on my motorcycle, like air pump while I ride! Charge lasts longer than expected.
Reviewed in the United States on June 7, 2025 by Patrick