---
product_id: 663373516
title: "Portable Car Jump Starter 4000A: 12V Battery Jumper Emergency for 10.0L Gas Diesel Engines, Power Booster Start Boost Charger, Intelligent Protection, USB-A Type-C Ports with mutifuctional Light"
brand: "green keeper"
price: "$138.31"
currency: USD
in_stock: false
reviews_count: 13
category: "Green Keeper"
url: https://www.desertcart.us/products/663373516-portable-car-jump-starter-4000a-12v-battery-jumper-emergency-10
store_origin: US
region: United States of America
---

# 4000A peak jump power 88.8Wh lithium battery capacity USB-A & PD65W Type-C charging Portable Car Jump Starter 4000A: 12V Battery Jumper Emergency for 10.0L Gas Diesel Engines, Power Booster Start Boost Charger, Intelligent Protection, USB-A Type-C Ports with mutifuctional Light

**Brand:** green keeper
**Price:** $138.31
**Availability:** ❌ Out of Stock

## Summary

> ⚡ Power up your ride & your life—jump start like a pro, charge like a boss!

## Quick Answers

- **What is this?** Portable Car Jump Starter 4000A: 12V Battery Jumper Emergency for 10.0L Gas Diesel Engines, Power Booster Start Boost Charger, Intelligent Protection, USB-A Type-C Ports with mutifuctional Light by green keeper
- **How much does it cost?** $138.31 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/663373516-portable-car-jump-starter-4000a-12v-battery-jumper-emergency-10)

## Best For

- green keeper enthusiasts

## Why This Product

- Trusted green keeper brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Zero Voltage Start:** Exclusive force start technology powers your car from a completely dead battery (0V)—ultimate peace of mind.
- • **Compact & Ready to Roll:** Lightweight, portable design fits glove compartments and travel bags—emergency power wherever life takes you.
- • **Safety-First Smart Tech:** Advanced protections including spark-proof, reverse polarity, and overcurrent safeguards—drive with confidence.
- • **Unstoppable Power Boost:** 4000A peak current to jump start even 10.0L gas & diesel engines—never get stranded again.
- • **All-in-One Emergency Hub:** Integrated USB-A & PD65W Type-C ports keep your devices charged on the go—stay connected anywhere.

## Overview

The GREEN KEEPER GK-J1205 Portable Car Jump Starter delivers a massive 4000A peak current to jump start 12V vehicles with engines up to 10.0L gas or diesel. Featuring an 88.8Wh lithium battery, it doubles as a versatile power bank with USB-A and PD65W Type-C ports for charging smartphones, tablets, and laptops. Its exclusive zero-voltage start technology ensures your car fires up even from a completely dead battery. Compact and lightweight, it includes intelligent safety protections and a multifunctional LED light, making it an essential all-weather emergency companion for every driver.

## Description

Portable Car Jump Starter 4000A: 12V Battery Jumper Emergency for 10.0L Gas Diesel Engines, Power Booster Start Boost Charger, Intelligent Protection, USB-A Type-C Ports with mutifuctional Light : desertcart.co.uk: Automotive

Review: Works really well. Excellent piece of kit and great value. - Just had a chance to use it for the first time this morning, on someone else's car. It was very simple to connect up and the car with the gutless battery started first time. Very impressed and pleased that I had it. I bought this neat little device to carry around in my EV just in case the 12v battery on that failed (which it never has) and also so that I could jump start other people's cars (I always carried jump leads in the past for this reason, but the EV's 12v battery can't be used with those). I've yet to try starting a car with a completely discharged battery but that seemed like a pretty important feature when I was considering which jump starter to buy. Pros: Simple to use, plenty of power capacity, seems to be solidly built, packs into a tidy little case, has potentially useful additional features (emergency light, powering coolbox, charging phone etc), holds its charge for a very long time when not in use and is very good value for money. Cons: None
Review: Multi function and great! - Really good bit of kit! Cheap for me in sales but I would pay full price it’s worth it! Fits under my seat, charges in couple hours, seems to last but I don’t need to use it only for emergencies, torch light is handy! All rounder works. Easy to use.

## Features

- Start Flat Battery: Our exclusive force start feature allows you to start your car even when the battery is completely drained at 0 voltage. This advanced technology sets our product apart from most jump starters, offering superior performance in critical moments.
- Powerful and Reliable Jump Starter: The GK-J1205 Jump Starter is not just a jump starter; it’s a comprehensive solution for your car’s emergency needs. Capable of delivering 2000A starting current and reaching a 4000A peak, this car battery jump starter is designed to efficiently jump start most 12V vehicles, including those with 10.0L gas and diesel engines. Ensure you’re never stranded with a dead battery again with this powerful jump starter.
- Portable Battery Jumper Starter: Compact yet robust, the GK-J1205 Jump Starter is your ideal portable battery jumper starter. With dimensions of 212.21×89.78×105.64 mm, it’s easy to store in your car's glove compartment or travel bag, making it ready for unexpected battery drains. This lightweight device is easy to carry and handle, ensuring you have a reliable power source wherever you go.
- Multifunctional Car Jumper Starter Portable: This car jumper starter portable device does more than just jump start your car. It includes an 88.8Wh lithium battery with multiple output ports, including a QC18W USB-A port and a PD65W Type-C port, making it perfect for charging your smartphones, tablets, laptops, and other USB devices on the go. The built-in LED light with multiple modes (Lighting/Strobe Light/SOS) adds to its versatility.
- Jump Start Battery Pack with Safety in Mind: Safety is paramount with the GK-J1205 Jump Starter. Equipped with an intelligent protection system, it features overcurrent, overcharge, overdischarge, and short-circuit protections, along with spark-proof technology and reverse polarity protection. This ensures safe and secure operation, giving you peace of mind during emergencies.
- All-in-One Portable Car Jump Starter: The GK-J1205 Jump Starter is a comprehensive car jump starter kit. It comes with a jump start battery pack, heavy-duty jumper cables, a Type-C charging cable, a cigarette lighter adapter, and a durable carrying case. Whether you have a sedan, SUV, motorcycle, or boat, this portable car jump starter ensures you’re never stranded with a dead battery. Designed for all weather conditions, it operates effectively from -20℃ to 60℃ (-4°F to 140°F), making it a reli

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D781JJPD |
| Amperage | 4000 Amps |
| Batteries | 1 Lithium Metal batteries required. (included) |
| Best Sellers Rank | 19,034 in Automotive ( See Top 100 in Automotive ) 137 in Car Battery Jump Starters |
| Brand | GREEN KEEPER |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,750) |
| Date First Available | 16 Jun. 2024 |
| Delivery information | We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout. |
| Item Weight | 1.32 kg |
| Item model number | GK-J1205 |
| Manufacturer | Shenzhen Crosstech Co.,Ltd |
| Manufacturer part number | GK-J1205 |
| Model | GK-J1205 |
| Product Dimensions | 8.97 x 21.23 x 10.57 cm; 1.32 kg |

## Product Details

- **Battery cell composition:** Lithium Ion
- **Brand:** GREEN KEEPER
- **Product dimensions:** 9D x 21.2W x 10.6H centimetres
- **Vehicle service type:** Automotive
- **Voltage:** 12 Volts

## Images

![Portable Car Jump Starter 4000A: 12V Battery Jumper Emergency for 10.0L Gas Diesel Engines, Power Booster Start Boost Charger, Intelligent Protection, USB-A Type-C Ports with mutifuctional Light - Image 1](https://m.media-amazon.com/images/I/711PDwHVTOL.jpg)
![Portable Car Jump Starter 4000A: 12V Battery Jumper Emergency for 10.0L Gas Diesel Engines, Power Booster Start Boost Charger, Intelligent Protection, USB-A Type-C Ports with mutifuctional Light - Image 2](https://m.media-amazon.com/images/I/71C0LjxI4WL.jpg)
![Portable Car Jump Starter 4000A: 12V Battery Jumper Emergency for 10.0L Gas Diesel Engines, Power Booster Start Boost Charger, Intelligent Protection, USB-A Type-C Ports with mutifuctional Light - Image 3](https://m.media-amazon.com/images/I/71FslNnR9TL.jpg)
![Portable Car Jump Starter 4000A: 12V Battery Jumper Emergency for 10.0L Gas Diesel Engines, Power Booster Start Boost Charger, Intelligent Protection, USB-A Type-C Ports with mutifuctional Light - Image 4](https://m.media-amazon.com/images/I/71OCI-mHlyL.jpg)
![Portable Car Jump Starter 4000A: 12V Battery Jumper Emergency for 10.0L Gas Diesel Engines, Power Booster Start Boost Charger, Intelligent Protection, USB-A Type-C Ports with mutifuctional Light - Image 5](https://m.media-amazon.com/images/I/71Tz-wOETRL.jpg)

## Available Options

This product comes in different **Model** options.

## Questions & Answers

**Q: How to jump start?**
A: 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%.

**Q: Is GK-J1205 suitable for my vehicle?**
A: The GK-J1205 suits cars, trucks, boats, buses, SUVs, RVs, lawn mowers, motorcycles, and more, with gasoline engines up to 10.0L and diesel engines up to 10.0L. Designed for 12V lead-acid batteries only, not for other battery types.

**Q: What should I do before using the jump starter?**
A: All Green Keeper jump starters come partially charged out of the box but need to be charged prior to first use.

**Q: How many times can I charge my phone with GK-J1205？**
A: To determine how many times a 3.7V/24000mAh power bank can charge an iPhone (3000mAh battery), consider power transfer efficiency (60%). A 100% charged GK-J1204 can charge the phone approximately 5 times, accounting for the 60% conversion efficiency

**Q: Why does your product prominently display the peak current on the cover, while others don't?**
A: 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works really well. Excellent piece of kit and great value.
*by G***S on 18 June 2025*

Just had a chance to use it for the first time this morning, on someone else's car. It was very simple to connect up and the car with the gutless battery started first time. Very impressed and pleased that I had it. I bought this neat little device to carry around in my EV just in case the 12v battery on that failed (which it never has) and also so that I could jump start other people's cars (I always carried jump leads in the past for this reason, but the EV's 12v battery can't be used with those). I've yet to try starting a car with a completely discharged battery but that seemed like a pretty important feature when I was considering which jump starter to buy. Pros: Simple to use, plenty of power capacity, seems to be solidly built, packs into a tidy little case, has potentially useful additional features (emergency light, powering coolbox, charging phone etc), holds its charge for a very long time when not in use and is very good value for money. Cons: None

### ⭐⭐⭐⭐⭐ Multi function and great!
*by H***D on 26 December 2025*

Really good bit of kit! Cheap for me in sales but I would pay full price it’s worth it! Fits under my seat, charges in couple hours, seems to last but I don’t need to use it only for emergencies, torch light is handy! All rounder works. Easy to use.

### ⭐⭐⭐⭐⭐ Brilliant Jump Starter That Works 100% !!
*by E***D on 4 January 2026*

I Have Purchased 3 Other Jump Starters over The Last Month, And had to Return them for A Refund because they Hardly turned the engine over, and Didn't Work ! This Particular One is 100% Brilliant and Started My Car With A Flat Battery Instantly, and used Hardly Any Power ! Proven Quality, And Would Highly Recommend !!

## Frequently Bought Together

- 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
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- AstroAI Tyre Inflator Air Compressor 12V DC, Digital Car Tyre Pump 150 PSI, Preset Tyre Pressure & Auto Shutoff, Electric Air Pump for Car Tyres, Bicycles, Other Inflatables (Yellow)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-11*