BOOKOO A9 Jump Starter 4000A – Portable 12V Battery Booster for Gas (12L) / Diesel (10L)

Meet the BOOKOO A9 Jump Starter 4000A

A compact power tool designed for life on the move, the BOOKOO A9 combines strength and simplicity. With a 74Wh pack and 20,000mAh capacity, it delivers a reliable boost to revive a dead or slow-cranking battery in seconds. It’s rated to start gasoline engines up to 12L and diesel engines up to 10L, and it’s built to perform across a wide temperature range from -4°F to 149°F. Whether you’re in a car, boat, lawn mower, or farm vehicle, the A9 is meant to be dependable, easy to use, and ready when you need it most.

Versatile power on the go

Beyond jump-starting, the A9 offers flexible charging options to keep devices alive during a day of errands or travel. It features two USB outputs and a fast USB-C port. The 5V/2.1A output covers phones and GPS devices, while the 5V/3A 9V/2A 12V/1.5A outputs support tablets, cameras, and more. Quick Charge 3.0 enables faster recharging of compatible devices, so you stay connected without reaching for a wall outlet.

• Powerful performance: 4000A peak, 20000mAh capacity, capable of starting gasoline engines up to 12L and diesel engines up to 10L.
• Smart safety and clarity: 10 protections safeguard against over-current, over-load, over-voltage, over-charge, short circuits, reverse polarity, and more; status is shown with indicators and beeps.
• All-weather reliability: IP66-style water resistance with a waterproof stopper, designed to handle rain, snow, and varying temperatures.

Lightweight, organized, and ready

At under 0.9 pounds and roughly the size of a compact book, the A9 slips into a glove box or bag with ease. The included storage case keeps clamps and cables neatly organized, helping you avoid misplaced parts. A built‑in flashlight with three modes adds practical illumination for roadside tasks or late-night adventures.

• Long-lasting power: A single charge can jump-start a dead battery more than 50 times and recharge essential devices multiple times.
• Simple, safe operation: intuitive indicators and a smart clamp beep provide quick guidance for correct connections.

In short, the BOOKOO A9 combines a strong jump-start capability with versatile USB charging, practical lighting, and thoughtful organization. It’s designed to fit active lifestyles where practical, flexible power on the go can make a difference without adding complexity.