1. Insert clamps into the EC5 port. 2. Securely connect clamps to battery terminals. 3. Start engine within 30 seconds when the light is green. 4. Disconnect clamps promptly after starting. *Ensure the Jump Starter battery volume is above 50%.

Is GK-J1204 suitable for my vehicle?

The GK-J1204 suits cars, trucks, boats, buses, SUVs, RVs, lawn mowers, motorcycles, and more, with gasoline engines up to 8.0L and diesel engines up to 8.0L. Designed for 12V lead-acid batteries only, not for other battery types.

What should I do before using the jump starter?

All Green Keeper jump starters come partially charged out of the box but need to be charged prior to first use.

How many times can I charge my phone with GK-J1204？

To determine how many times a 3.7V/20000mAh power bank can charge an iPhone (3000mAh battery), consider power transfer efficiency (60%). A 100% charged GK-J1204 can charge the phone approximately 4 times, accounting for the 60% conversion efficiency

Why does your product prominently display the peak current on the cover, while others don't?

Many products avoid printing this to allow flexibility in altering peak current claims on listings. We print the actual, tested peak current directly on the product, ensuring transparency and reliable performance.

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Portable Car Battery Jump Starter: 3000A Battery Jumper Pack for Car Engines Up to 8.0L Gas/Diesel, Ultrasafe Jumper Box with Jumper Clamps & Emergency LED Lights, Power Bank with PD65W Quick Charge

Product ID: 663373516

Details

Battery cell composition
Lithium Ion
Brand
GREEN KEEPER
Product dimensions
21.1D x 15.2W
Vehicle service type
Several types
Voltage
12 Volts

⚡3000A peak jump power

🔋PD65W fast power bank

🚗Supports up to 8.0L engines

Description

🚀 Power up your ride & your life—never get stranded again!

EMERGENCY READY - Built-in LED with Strobe, SOS & Lightning modes ensures you’re never left in the dark.
SAFETY FIRST TECH - 10 advanced protections including spark-proof and reverse polarity keep you and your car safe.
COMPACT ERGONOMIC - Lightweight 830g design with gear-shaped grip fits perfectly under your seat or in your bag.
INSTANT POWER BOOST - 3000A peak amps jump-starts dead batteries in seconds, no more waiting in the cold.
VERSATILE POWER HUB - PD65W quick charge powers laptops, drones, and phones—your all-in-one road companion.

The GREEN KEEPER GK-J1204 Portable Car Battery Jump Starter delivers a robust 3000A peak current to jump-start gas and diesel engines up to 8.0L. Beyond jump-starting, it doubles as a PD65W fast-charging power bank and features a multi-mode emergency LED light. Designed with 10 built-in safety protections and an ergonomic compact form, it’s the ultimate all-in-one roadside essential for professionals who demand reliability and versatility on the go.

Specifications

ASIN	B0CZVB94CM
Amperage	3000 Amps
Automotive Fit Type	Universal Fit
Battery Capacity	20000 Amp Hours
Best Sellers Rank	62,436 in Automotive ( See Top 100 in Automotive ) 216 in Car Battery Jump Starters
Brand Name	GREEN KEEPER
Compatible with Vehicle Type	Several types of vehicles
Customer Reviews	4.2 4.2 out of 5 stars (356)
Included Components	Carrying Case, GK-J1204 Jump Starter, Jumper Cables, USB Charging Cable, User Manual
Item Dimensions D x W x H	21.1D x 15.2W x 8.1H centimetres
Item Weight	0.83 Kilograms
Manufacturer	Dong guan Carosstech Co.,Ltd
Manufacturer Part Number	GK-J1204
Manufacturer Warranty Description	18 Months Warranty
Model Number	GK-J1204
Number of Items	1
Peak Output Current	3000 Amps
Specification Met	CE, FCC, UL
Voltage	12 Volts
battery-cell-composition	Lithium Ion

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