The GOOLOO A9 Ultra is the better jump starter overall, rated 4.0 to 3.7. The GOOLOO A9 Ultra leads on value and capacity. The GOOLOO A9 Ultra costs $50.01 less ($199.98 vs $249.99).
GOOLOO’s top combined jump starter and inflator, rated for any gas engine and big diesels, with fast 100 W USB-C charging. Worth it if you want one heavy-duty tool for trucks, RVs and travel.
Amazon $199.98For owners of big gas trucks and diesel pickups who want a compact pack that recharges fast over USB-C. Cheaper packs cover smaller engines just as well.
Amazon $249.99Prices 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.
Each factor is scored 0-100 against the same fixed reference points for every heavy duty jump starter; a clear win is highlighted. How we rank explains each one.
| Factor weight | GOOLOO A9 Ultra | Antigravity XP-20-HD Micro-Start |
|---|---|---|
| Overall rating | 4.0/5 | 3.7/5 |
| Value 40% | 71 $199.98 for its size | 57 $249.99 for its size |
| Features 35% | 80 manual override, rated to -4 °F, USB-C charging | 80 manual override, rated to -4 °F, USB-C charging |
| Capacity 15% | 75 99.9 Wh battery | 61 88.8 Wh battery |
| Warranty 10% | 25 1.5-year warranty | 25 1.5-year warranty |
| GOOLOO A9 Ultra | Antigravity XP-20-HD Micro-Start | |
|---|---|---|
| Starting | ||
| Rated engines | all gas, 12 L diesel | 10 L gas, 8 L diesel |
| Peak amps (maker) | 6,000 A | 4,650 A |
| Cranking amps | 480 A | 930 A |
| Voltage | 12 V | 12 V |
| Manual override | Yes | Yes |
| Lowest operating temperature | -4 °F | -4 °F |
| Battery and charging | ||
| Chemistry | Lithium-ion | Lithium-ion |
| Capacity | 99.9 Wh | 88.8 Wh |
| Capacity (mAh) | 27,000 mAh | 24,000 mAh |
| USB-C input | 100 W | 100 W |
| Recharge time | 1.5 hours | 1 hours |
| USB outputs | USB-C 100 W, USB-A 5 V/2.4 A | USB-C 100 W, USB-A QC3.0 18 W, USB-A 12 W |
| Build | ||
| Flashlight | Yes | Yes |
| Air compressor | Yes | No |
| Dimensions | 11.4 x 6.49 x 3.18 in | 9.4 x 4 x 1.9 in |
| Weight | 4.8 lb | 2.1 lb |
| Warranty | 1.5 years | 1.5 years |
| Released | 2026-09 | 2023-03 |
