These units provided strong jump-starting performance, along with good accessory charging options. Of the 10 units we tested, we awarded Recommended status to five: The Antigravity Batteries XP-10, Spirit A8 Car Jump Starter, Bolt Power D28, New Brights Compact 12000mAH Mini Portable Car Jump Starter, and PowerAll PBJS12000R. And the second-priciest model (Noco Genius Boost GB30, $105) came in second-to-last place in our ratings. While the best-performing jumper pack (Antigravity Batteries XP-10, $125) was the most expensive, the weakest performer (Pilot InstaBoost) was not the least expensive-we paid $100 for it. Incidentally, price turned out to be little indication of performance. (Interestingly, the Revo did almost as well as the Antigravity unit in our jump-start tests.) We consider this the power-source performance to be a notable factor, as these units can keep vital devices, such as mobile phones, charged up during a power outage. It provided power for three times as long as the poorest performers, which came from Revo and Noco. The best-performing unit was the Antigravity Batteries XP-10. Where we did see lots of variance was in the units’ abilities to charge devices, such as tablets and laptops. When the battery packs were at room temperature, most were able to successfully jump start a frozen car battery.
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