Bests & Worsts Reviews from Amazon

Surprisingly light and small. Charged quickly and was ready to roll. My Jeep Wrangler battery was dead, so I made a video of me trying to jump it. It turns out I needed to leave the GB40 connected to my battery terminals for a minute or so before the engine was ready to turn over. I used the GB40 three times in one day (I was intentionally seeing how it would perform) and the charge was down to the 75% mark. After the first jump (needing to keep the battery connected for a minute), the two other jumps were instant. My batter probably just needed more help on the first jump. I'm very impressed with how lightweight and well-made the product feels. You may want to ensure the clamps reach your positive and negative/ground posts, since they don't have a lot of reach between them. They fit a standard battery easily. My wife's vehicle has the ground post separated from the exposed positive terminal on her battery, but it still reached without issue. Note - these come with a USB cable to charge it, but it does NOT come with an AC wall charger. I used an AC USB wall charger (https://www.amazon.com/gp/product/B07JHZXCQD) to charge two of these at once (one for me, one for my wife) - they simultaneously charged to 100% in less than three hours.