1. Insert clamps into the EC5 port.

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Sponsored Ad – Car Jump Starter 3000A Portable: 12V Jump Start Battery Pack for 8.0L Gas/Diesel Engines, Car Battery Jumper Starter with PD65W Fast Charge, Smart Jumper Cable for Safety, 3 Emergency LED Lights Kit

Sponsored Ad – Car Jump Starter 3000A Portable: 12V Jump Start Battery Pack for 8.0L Gas/Diesel Engines, Car Battery Jumper Starter with PD65W Fast Charge, Smart Jumper Cable for Safety, 3 Emergency LED Lights Kit

Q: Is GK-J1203 suitable for my vehicle?

The GK-J1203 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.

Q: 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.

Q: How many times can I charge my phone with GK-J1203？

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-J1203 can charge the phone approximately 4 times, accounting for the 60% conversion efficiency

Q: Why does your product display the peak current on the cover?

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.

Product ID: 666778283

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Details

Brand
GREEN KEEPER
Product dimensions
22.7D x 22.7W
Item weight
0.83 Kilograms
Amperage
3000 Amps
Peak output current
1500 Amps

⚡3000A peak jump start power

🔋20000mAh dual-use power bank

🛡️Smart safety protections

Frequently Bought Together

Description

🚗⚡ Jumpstart your journey, power your lifestyle—safety and speed in one sleek pack!

UNMATCHED JUMP POWER - 3000A peak current revives engines up to 8.0L gas/diesel—never get stranded again.
VERSATILE 12 V OUTPUT - Power all your 12V car gadgets—fridges, vacuums, washers—keeping you road-ready.
DUAL PURPOSE POWERHOUSE - 20,000mAh battery doubles as a PD65W fast-charging power bank for your devices on the go.
EMERGENCY READY LED KIT - Three bright LED lights ensure you’re prepared for any roadside or outdoor emergency.
SAFETY FIRST SMART CLAMPS - Built-in spark proof, reverse polarity & temperature protection for worry-free jump starts.

The Green Keeper GK-J1203 is a compact, 830g portable jump starter delivering a powerful 3000A peak current to jump start vehicles with engines up to 8.0L gas or diesel. Featuring a 20,000mAh battery, it doubles as a PD65W fast-charging power bank for laptops and smartphones. Equipped with smart safety features like spark proof and reverse polarity protection, it ensures safe and reliable use. The device also powers 12V car accessories and includes three emergency LED lights, making it an essential all-in-one roadside companion for professionals who demand readiness and reliability.

Specifications

Manufacturer	Dongguan Carosstech Co. , Ltd.
Brand	GREEN KEEPER
Model	GK-J1203
Product Dimensions	9 x 22.6 x 5.4 cm; 830 g
Batteries	1 Lithium Metal batteries required. (included)
Item model number	GK-J1203
Manufacturer part number	GK-J1203
Amperage	3000 Amps
Item Weight	830 g

Have a Question? See What Others Asked

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How many times can I charge my phone with GK-J1203？

Why does your product display the peak current on the cover?

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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