Will it start a completely dead battery?

I started a vehicle with stolen battery, just use "boost" button. This button forces voltage to be present from YESPER even when no voltage detected from target. The normal safety protocol requires target voltage to be detected before YESPER will supply voltage itself this safety is YESPER proving correct cable hookup. In my nobattery present jump the Vehicle started right up and remained running. Obviously, target vehicle died the instant I removed YESPER and I did not let YESPER stay connected but a few seconds. The point of here is to say yes, it will start when a vehicle with a totally dead battery.

Can transport it abroad?

Dear Customer: Which country are you from? If you are interested in our products, we are willing to arrange another shipping specially for you. For further communication, you can email us. We provide a timely online response for our customers. Sincerely Yesper

Is this yesper set up to allow for faster home charging, like using a 30w usb c charger wall adapter? or some other way to speed that up? thanks!

No box say's 15 watts input! Got one from amazon works great.

If after hooking this up and cranking the starter it does not start what steps need to take place to try and start it again?

Ok...when you read the little booklet it will tell you...there is a little button near the blinking green light you press to fully energize...that should get you your solid green light.

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YESPER 4120A 12V Car Battery Jump Starter Portable Pack

Product ID: 414132001

Details

Battery Cell Composition
Polymer
Brand
YESPER
Product Dimensions
8.82"D x x
Vehicle Service Type
Passenger Car
Voltage
12 volts

⚡4120A peak jump start power

🔋26800mAh high-capacity battery

🛠️Multi-port USB & DC output

¥30414

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Jumpstart your journey with power and style — never miss a beat on the road!

UNMATCHED JUMP POWER - Real 4120A peak amps to jump start all 12V vehicles, including gas and up to 10L diesel engines — never get stranded again.
DURABLE INTELLIGENT - Fire-proof ABS shell with DSLI IV tech boosts voltage by 30%, ensuring faster, safer starts even in extreme climates (-4℉ to 140℉).
COMPACT TRAVEL READY - Lightweight 1.38 lbs with a sleek carry case — fits perfectly in your glove box or backpack for on-the-go peace of mind.
MASSIVE 26800 M AH BATTERY - Power through up to 60 jump starts on a single charge plus charge your devices with USB QC and Type-C ports.
EMERGENCY READY LED MODES - Three versatile LED light modes (flash, strobe, SOS) to keep you safe and visible during roadside emergencies or outdoor adventures.

The YESPER 4120A 12V Car Battery Jump Starter is a portable powerhouse featuring a 26800mAh polymer battery capable of delivering 4120 amps peak current. Designed for all 12V vehicles including large diesel engines up to 10L, it supports up to 60 jump starts per charge. Equipped with multi-port USB and DC outputs, a rugged fire-proof ABS casing, and intelligent DSLI IV control technology, it ensures fast, safe starts in extreme temperatures. Its compact size and included carry case make it an essential travel companion with added LED emergency lighting for versatile use.

Specifications

ASIN	B09Q15SPZJ
Amperage	4120 A
Battery Capacity	26800 milliamp_hours
Battery Type	Polymer
Best Sellers Rank	#30,095 in Automotive ( See Top 100 in Automotive ) #183 in Jump Starters
Brand Name	YESPER
Compatible with Vehicle Type	Passenger Car, Motorcycle, ATV, RV, UTV, Truck,Snowmobile, Lawn Mower
Customer Reviews	4.5 4.5 out of 5 stars (1,252)
Item Dimensions D x W x H	8.82"D x 3.53"W x 1.72"H
Item Highlight	26800mAh Battery Start Booster Box(All Gas, up to 10.0L Diesel Engine), with Carry Case, Jumper Cables, LED Light
Manufacturer	YESPER
Manufacturer Part Number	YESPER
Model Number	YJS40
Number of Items	1
Peak Output Current	4120 A
Voltage	12 volts

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