Cobra Marine JumPack H2O

Power on the road, power on the water

Designed to jump start marine outboard engines and large v8 gasoline and diesel engines, the Cobra Marine JumPack H2O is our most powerful and versatile JumPack yet. The rugged, waterproof design makes it the perfect portable power device all year long.
Cobra Marine JumPack H2O
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Enjoy free standard shipping on all orders of $80 and up. Select Free Ground Shipping over $80 at checkout.

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Not satisfied? No questions asked. All products purchased factory direct come with a 30-day money back guarantee.

Technology You Need

From repairing televisions in a small garage to a world leader in consumer electronics—our 50 years of innovation allows us to deliver the technology you need for a modern driving experience.

Never Be Powerless with a JumPack

Car batteries die more often than you’d like. Bring them to life with a Cobra JumPack. Small, convenient, and powerful, these portable power packs can jump start just about any vehicle while also charging your phone multiple times on a single charge.

Two Ways to Start

Jump start your vehicle the traditional way or through the 12V port (CLP) inside your vehicle.

All-Weather Performance

Waterproof and UL 2743 Safety Standard compliant, the JumpPack H20 is ideal for all weather, indoor and outdoor use.

Dual USB Ports

Quickly charge up to two portable devices simultaneously with the included 3 amp USB ports.

Powerful and Compact

Contains a powerful 44.4Wh (12,000mAh) battery designed to jump outboard boat engines or large v8 gasoline and diesel engines.

Emergency Flashlight

Features a built-in flashlight with SOS and strobe functions for emergency situations on the water or roadside assistance.

Easy Recharge

Recharge your JumPack H20 using the 12V DC charger in your vehicle or a 120V conventional wall plug.

400 Amp Starting Current

600 amp peak gives you the ability to jump start most gasoline and diesel engines

Dual USB Charging Ports

Charge two mobile devices quickly and simultaneously

Two Start Options

Jump start direct from the battery or from the interior 12V port

Built-In Flashlight

Bright flashlight with SOS and strobe for emergencies

Lithium Cobalt Battery

1200mAh, 44.4Wh battery holds a charge longer

Weatherproof and Portable

UL 2743 Safety Standard compliant for all-weather use

What’s Included

With your JumPack H20 you’ll receive jumper cables, 12V CLP charger, JumPack charge adapter cable, AC wall adapter, and carrying case.

  • JumPack H20
  • Jumper cables
  • 12V CLP charger
  • JumPack charge adapter cable
  • AC wall adapter
  • Carrying case


Weight:  1.50 lbs (680.39g)

Height:  7.25 in (184.15mm)

Width:  4 in (101.6mm)

Depth:  1.5 in (38.1mm)


Jump start your car, truck, RV, outboard boat and charge your mobile devices safely in all weather conditions

12000 mAh, 44.4 Wh UL registered lithium-cobalt battery. Holds a charge longer and is smaller than traditional jumpstarters

400 Amp Starting Current, 600 Amp Peak Current. Jump starts gasoline and diesel vehicles

Two Jump Start Options: Direct from the battery and from the vehicle’s 12V port (CLP)

Charges mobile devices multiple times

Dual 3 Amp USB Ports for rapid charging of two portable devices simultaneously

Built-in LED flashlight - Super-bright Flashlight, Strobe and SOS LED

UL 2743 Safety Standard Compliant

How often should I charge my JumPack?

To maintain a full charge on your JumPack, it is recommended to charge it every few months.

If you keep the JumPack in your home, leave the charger plugged in all the time. The internal charging circuit will maintain a full charge on the battery without any risk of overcharging.

Operating the button on the JumPack


Press and release the button.  If the battery is fully charged then all four LEDs will illuminate.


Press and hold the button.  After a few seconds the light should turn on.

After the light is on:

1. Pressing the button will cause the light to strobe.

2. Pressing the button a second time will cause the light to flash an S-O-S signal.

3. Pressing the button a third time will turn off the light.

The light does not work.

To turn on the light, press and hold the button on the JumPack. After a few seconds the light should illuminate. If the light does not turn on, then the battery might be dead. Try charging the JumPack.

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