AstroAI S8
#1 in Cars and SUVsFull review
A tiny, cheap starter for four- and six-cylinder cars. Fine as a glovebox backup, but not for trucks or V8s.
Amazon $42.19$42.19
The AstroAI S8 is the better jump starter overall, rated 4.0 to 3.3. The AstroAI S8 leads on value, warranty and capacity. The NOCO Boost Plus GB40 wins on features. The AstroAI S8 costs $57.76 less ($42.19 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 for value ($42.19 for its size vs $99.95 for its size), warranty (2-year warranty vs 1-year warranty) and capacity (29.6 Wh battery vs 24 Wh battery).
- Choose the NOCO Boost Plus GB40 for features (manual override, rated to -22 °F, USB-C charging, IP65 vs manual override, rated to -4 °F, USB-C charging).
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 | NOCO Boost Plus GB40 |
|---|---|---|
| Overall rating | 4.0/5 | 3.3/5 |
| Value 40% | 98 $42.19 for its size | 45 $99.95 for its size |
| Features 35% | 67 manual override, rated to -4 °F, USB-C charging | 87 manual override, rated to -22 °F, USB-C charging, IP65 |
| Capacity 15% | 24 29.6 Wh battery | 10 24 Wh battery |
| Warranty 10% | 50 2-year warranty | 0 1-year warranty |
Specifications
| AstroAI S8 | NOCO Boost Plus GB40 | |
|---|---|---|
| Starting | ||
| Rated engines | 6 L gas, 3 L diesel | 6 L gas, 3 L diesel |
| Peak amps (maker) | 1,500 A | 1,000 A |
| Voltage | 12 V | 12 V |
| Manual override | Yes | Yes |
| Lowest operating temperature | -4 °F | -22 °F |
| Battery and charging | ||
| Chemistry | Lithium-ion | Lithium-ion |
| Capacity | 29.6 Wh | 24 Wh |
| USB-C input | 10 W | 10.5 W |
| Recharge time | - | 3 hours |
| USB outputs | USB-A 5 V/2.1 A | USB 10 W |
| Build | ||
| Flashlight | Yes | Yes |
| Air compressor | No | No |
| Water resistance | - | IP65 |
| Dimensions | 7.9 x 4.5 x 3.7 in | 7.72 x 3.16 x 1.71 in |
| Weight | 0.9 lb | 2.5 lb |
| Warranty | 2 years | 1 year |
| Released | - | 2015-12 |