AstroAI S8 Air
#2 in Cars and SUVsFull review
A combined jump starter and tire inflator for small and mid-size cars. Good for drivers who want one compact roadside kit, not for trucks.
Amazon $59.99$59.99
The AstroAI S8 Air is the better jump starter overall, rated 3.7 to 3.3. The AstroAI S8 Air leads on value. The NOCO Boost Plus GB40 wins on features. The AstroAI S8 Air costs $39.96 less ($59.99 vs $99.95).
NOCO Boost Plus GB40
#4 in Cars and SUVsFull review
For drivers of four- and six-cylinder cars who want a proven, compact pack to keep in the car. Owners of bigger engines should step up to a GBX55 or larger.
Amazon $99.95$99.95
Prices were last checked October 22, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the AstroAI S8 Air for value ($59.99 for its size vs $99.95 for its size).
- Choose the NOCO Boost Plus GB40 for features (manual override, rated to -22 °F, USB-C charging, IP65 vs rated to -4 °F).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every cars and suvs jump starter; a clear win is highlighted. How we rank explains each one.
| Factor weight | AstroAI S8 Air | NOCO Boost Plus GB40 |
|---|---|---|
| Overall rating | 3.7/5 | 3.3/5 |
| Value 40% | 82 $59.99 for its size | 45 $99.95 for its size |
| Features 35% | 50 rated to -4 °F | 87 manual override, rated to -22 °F, USB-C charging, IP65 |
| Capacity 15% | 50 capacity not published in Wh (neutral score used) | 10 24 Wh battery |
| Warranty 10% | 50 warranty not published (neutral score used) | 0 1-year warranty |
Specifications
| AstroAI S8 Air | NOCO Boost Plus GB40 | |
|---|---|---|
| Starting | ||
| Rated engines | 6 L gas, 3 L diesel | 6 L gas, 3 L diesel |
| Peak amps (maker) | 3,000 A | 1,000 A |
| Voltage | 12 V | 12 V |
| Manual override | - | Yes |
| Lowest operating temperature | -4 °F | -22 °F |
| Battery and charging | ||
| Chemistry | Lithium-ion | Lithium-ion |
| Capacity | - | 24 Wh |
| Capacity (mAh) | 10,000 mAh | - |
| USB-C input | - | 10.5 W |
| Recharge time | - | 3 hours |
| USB outputs | - | USB 10 W |
| Build | ||
| Flashlight | Yes | Yes |
| Air compressor | Yes | No |
| Water resistance | - | IP65 |
| Dimensions | - | 7.72 x 3.16 x 1.71 in |
| Weight | 2.4 lb | 2.5 lb |
| Warranty | - | 1 year |
| Released | - | 2015-12 |