AstroAI S8 Ultra 4000A Car Jump Starter – Jump Box, Portable Power Bank & USB-C

Meet the AstroAI S8 Ultra, a high-capacity jump starter designed for real-world road scenarios. With a 4000A peak and a 45°C discharge rate, this jump box reliably revives gas engines and supports engines up to 12L diesel, even when the battery is near empty. Its ability to deliver a strong, steady boost makes it a practical companion for urban commutes, road trips, and fleet maintenance alike.

Powerful, yet Smart

The S8 Ultra blends raw power with intelligent operation. It analyzes the battery voltage and provides the right amount of boost to start the engine smoothly. For deeply drained batteries, a quick press of the Boost Button jump-starts efficiently, reducing guesswork in stressful moments.

• Smart jumper cables assess voltage and apply an appropriate boost automatically.
• Automatic boost options help you start quickly when the battery is low.

Safety, First

• Ten protections include reverse polarity, overcurrent, reverse connection, overvoltage, overcharge, overdischarge, overload, short circuit, and temperature safeguards.
• IP65 waterproof, dust-proof, and drop-proof housing adds reliability in challenging environments.

Power On The Go

• Multiple ports turn the jump starter into a portable charger for USB-C, USB-A, and other devices on the road.
• Keep your phone, tablet, or small gear powered up during long drives or service calls.

Designed for Real-Life Use

Smart battery indicators simplify operation, while a built-in three-mode LED flashlight aids nighttime work. The compact, rugged design makes it easy to stash in a trunk or toolbox for quick access when you need it.

Whether you’re navigating urban traffic, an overnight trip, or a roadside service scenario, the S8 Ultra offers dependable power without complicating the boost. It serves as a practical, non-mandatory option to keep essential devices ready and engines turning, with benefits that feel like possibilities rather than guarantees.