The AstroAI S8 Ultra is a compact lithium jump starter that delivers enough cranking power to start gasoline and diesel engines — without needing another vehicle. Whether you're dealing with a dead battery on the trail, in a parking lot, or at home, the S8 Ultra gets you started in seconds using its built-in jumper clamps and intelligent safety circuitry that protects against reverse polarity, overcharge, and short circuit.

Beyond jump starting, the S8 Ultra doubles as a high-capacity portable power bank for charging phones, tablets, and USB devices — making it a practical piece of kit for overlanding, daily carry, or emergency preparedness.

Features & Benefits

• High-output lithium battery — starts gasoline and diesel engines
• Intelligent safety protection — reverse polarity, overcharge, short circuit, and over-current protection
• Compact and lightweight — fits in a glove box or gear bag
• Built-in USB power bank — charges phones, tablets, and USB devices
• LED flashlight — useful for night-time roadside emergencies
• Ready to use — holds charge for extended storage periods

Fitment

Universal — compatible with gasoline and diesel engines. Check peak amperage rating against your engine's CCA requirement before purchase.