Hulkman Alpha 85
A good-value pick for cars, SUVs and gas pickups up to a V8, with a force-start mode and fast recharging. Buy the Alpha 85S instead if you live somewhere with hard winters.
Amazon $119.99$119.99
The Hulkman Alpha 85 is the better jump starter overall, rated 4.1 to 3.2. The Hulkman Alpha 85 leads on features and warranty. The Stanley LJ20F costs $3.58 less ($116.41 vs $119.99).
Stanley LJ20F
#19 in Trucks and V8sFull review
For drivers who want a lithium pack that recharges over USB-C and comes with both wall and car chargers. Those who need to revive a fully dead battery should pick a model with an override mode.
Amazon $116.41$116.41
Prices were last checked October 30, 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 Hulkman Alpha 85 for features (manual override, USB-C charging, IP65; rated to 5 °F vs rated to -4 °F, USB-C charging; no override for a flat battery) and warranty (2-year warranty vs 1-year warranty).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every trucks and v8s jump starter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Hulkman Alpha 85 | Stanley LJ20F |
|---|---|---|
| Overall rating | 4.1/5 | 3.2/5 |
| Value 40% | 68 $119.99 for its size | 70 $116.41 for its size |
| Features 35% | 85 manual override, USB-C charging, IP65; rated to 5 °F | 40 rated to -4 °F, USB-C charging; no override for a flat battery |
| Capacity 15% | 73 74 Wh battery | 50 capacity not published in Wh (neutral score used) |
| Warranty 10% | 50 2-year warranty | 0 1-year warranty |
Specifications
| Hulkman Alpha 85 | Stanley LJ20F | |
|---|---|---|
| Starting | ||
| Rated engines | 8.5 L gas, 6 L diesel | Cars and trucks up to V8 (no liter rating) |
| Peak amps (maker) | 2,000 A | 2,000 A |
| Voltage | 12 V | 12 V |
| Manual override | Yes | No |
| Lowest operating temperature | 5 °F | -4 °F |
| Battery and charging | ||
| Chemistry | Lithium-ion | Lithium-ion |
| Capacity | 74 Wh | - |
| Capacity (mAh) | 20,000 mAh | - |
| USB-C input | 65 W | 30 W |
| Recharge time | 1.5 hours | - |
| USB outputs | USB-C 18 W, USB-A QC3.0 18 W | USB-C PD 30 W, USB-A 15 W |
| Build | ||
| Flashlight | Yes | Yes |
| Air compressor | No | No |
| Water resistance | IP65 | - |
| Dimensions | 8.97 x 4.05 x 1.81 in | - |
| Warranty | 2 years | 1 year |
| Released | 2020-09 | 2026-05 |