---
product_id: 653425743
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: "€ 122.48"
currency: EUR
in_stock: true
url: https://www.desertcart.pt/products/653425743-portable-car-jump-starter-4000a-12v-battery-jumper-emergency-10
store_origin: PT
region: Portugal
---

# 4000A peak jump power 88.8Wh lithium battery capacity QC18W 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:** € 122.48
**Availability:** ✅ In Stock

## Summary

> ⚡ Jumpstart your journey, power your life—anytime, anywhere!

## 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?** € 122.48 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/653425743-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 Revival:** Exclusive force start technology powers your car from a completely dead battery at 0V.
- • **Safety-First Smart Tech:** Intelligent protection with spark-proof, reverse polarity, and overcurrent safeguards for worry-free use.
- • **Unstoppable Power Boost:** 4000A peak current to jump start even 10.0L gas & diesel engines—never get stranded again.
- • **Multi-Device Charging Hub:** Dual USB ports (QC18W USB-A & PD65W Type-C) keep your phone, tablet, and laptop powered on the go.
- • **Compact Emergency Lifesaver:** Lightweight (1.32kg) and portable design fits perfectly in your glove box or travel bag.

## 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 exclusive zero-voltage start technology, it revives dead batteries from 0V. Compact and lightweight at just 1.32kg, it fits easily in your car or travel bag. Beyond jump starting, it doubles as a power bank with QC18W USB-A and PD65W Type-C ports for charging multiple devices. Built-in LED light modes and comprehensive safety protections ensure reliable, secure operation in any emergency.

## 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

## 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 |
|---------------|-------|
| Manufacturer | Shenzhen Crosstech Co.,Ltd |
| Brand | GREEN KEEPER |
| Model | GK-J1205 |
| Product Dimensions | 8.97 x 21.23 x 10.57 cm; 1.32 kg |
| Batteries | 1 Lithium Metal batteries required. (included) |
| Item model number | GK-J1205 |
| Manufacturer part number | GK-J1205 |
| Amperage | 4000 Amps |
| Item Weight | 1.32 kg |

## Product Details

- **Brand:** GREEN KEEPER
- **Product dimensions:** 9D x 21.2W x 10.6H centimetres
- **Item weight:** 1.32 kg
- **Amperage:** 4000 Amps
- **Peak output current:** 4000 Amps

## 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/71povl2WYSL.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/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 4](https://m.media-amazon.com/images/I/61H37tHRn8L.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.

**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.

## Frequently Bought Together

- 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
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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-01-26*