AstroAI S8 Ultra Lithium Jump Starter 4000A
- 4000A peak, 45C discharge rate
- All gas and up to 12L diesel engines
- 16000mAh lithium polymer battery
- IP65 waterproof and dust-proof
- Smart jumper cables with indicators
- 10 safety protections
- 1.8 pounds, 24-month warranty
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A light, weather sealed jump starter with enough output for big gas and diesel engines. Port details are thin and no wall charger is included.
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ASIN: B0CB3W9FRDModel: S8 UltraCategory: Jump Starters
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Overview
Not just a power bank with clamps, the AstroAI jump starter is a heavy duty lithium booster sized for big engines, with a sealed, drop-proof case. Smart cables read the battery and either start on their own or prompt for boost.
Owners of large gas and diesel vehicles get high starting current in a light, weather sealed pack. Port details and recharge time are thin in the listing, and no wall charger comes with it.
Who it's for
Work trucks, RVs and snowmobiles left out in wet weather suit the sealed case and high output. Anyone needing a compressor or a large charging hub should look at a combo unit.
Pros and cons
- High output for large diesels
- Automatic start on low batteries
- Boost for fully drained batteries
- Sealed against water and dust
- Wall charger not included
- Port count and output not listed
- No air compressor
Performance notes
The high discharge rate battery delivers its peak current quickly through the smart cables. Those cables measure battery voltage first, starting automatically on a weak battery and asking for boost on a fully drained one.
Specifications
| Brand | AstroAI |
|---|---|
| Model | S8 Ultra |
| Dimensions & fit | |
| Item weight | 1.8 pounds |
| Engine size | All gas, up to 12L diesel |
| Capacity & performance | |
| Peak Output Current | 4000A |
| Battery Capacity | 16000mAh |
| Power & efficiency | |
| Battery Type | Lithium polymer, 45C discharge |
| Voltage | 12V |
| Construction & materials | |
| Color | Orange |
| Compatibility & installation | |
| Compatible with Vehicle Type | ATV, lawn mower, motorcycle, passenger car, RV, snowmobile, truck, UTV |
| Warranty & support | |
| Manufacturer Warranty Description | 24 months |
| Other details | |
| Specification Met | IP65 |
| Protections | 10, including reverse polarity, short circuit, spark-resistance |
| Extra functions | Type-C power bank, flashlight with 3 modes |
Frequently asked questions
What comes in the box with the AstroAI S8 Ultra?
The listing names the jump starter and smart jumper cables and states the wall charger is not included. No full packing list is given.
Can the AstroAI S8 Ultra start a completely dead battery?
Yes. Below 9 V it prompts you to press the Boost Button to start a fully-drained battery; at 9-12 V it starts automatically once the cables connect.
Does the AstroAI S8 Ultra inflate tires?
No air compressor is described. It is a jump starter, power bank and flashlight.