Top positive review
This thing absolutely works.
Reviewed in the United States on February 4, 2019
Coworker's battery was dead when I came in for crew change yesterday. This thing's been sitting in my car for months. (I don't think I've taken it out since my alternator went bad.) The battery was still over 80%. It jumped my coworker's truck no problem, and it's still well over 80% charged. Has proven to be a great product so far.
**ORIGINAL REVIEW BELOW**
The belt on my alternator recently went bad causing the battery to gradually lose its charge. I used this thing to start my car, with the battery virtually completely dead, at least four times (in the same night). Of course it didn't stay running for long, as it was almost completely dead and receiving no charge from the alternator, but this charger started it without any difficulty each time and still had plenty of charge left to go.
I feel it was worth the money as such and feel much better about giving two more of them as gifts to family. It works. It does what it's supposed to do. End of story. (I have the yellow one but I got the red one for a family member as a gift.)
My only complaint is that the material of the webbing in the carrying case scuffs up the display on the unit. As stated earlier, I got three of these jump starters, and all three had display scuffing when I received them. I really dislike cosmetic defects on a new product. When I buy something new I want it to look new. I thought they were shipping them like that, but after noticing it got worse after I got it, I realized it was the webbing in the carrying case causing it. (See included images.) The webbing is rubbing against the display as it slightly bounces around in the back of my vehicle marring the surface. So apparently it got scuffed up a little in transit to me, and then even more during transit in my vehicle after receiving it.
It puzzles me why anyone would design a case that does mild damage to the product it holds. (I once had a camera case that did the same thing to my camera display. A much more expensive, and therefore aggravating, problem.) It's not an issue, yet, but I could see it becoming an issue over time as progressive scuffing makes the display possibly more difficult to read in the daylight. (Because the scratches will obscure the text and reflect light in odd directions. You know, like a scratched up watch face or phone screen or something.) I've begun putting the unit in a large zip-lock prior to putting it in the carrying case in order to mitigate this. Just thought I'd make people aware of this. You may want to wrap it in a cloth or something before putting it away.
I'm also a little concerned that the cable clamps are mostly made of what looks like a rather brittle plastic. I got one of another brand, and though I like that device's design and construction less than this one, the cables are much higher quality with clamps that have a lot more metal underneath the plastic exterior. While it's not currently an issue, I'm a little concerned about their longevity, as the plastic seems like the sort that gets very brittle with age and eventually just cracks and/or breaks apart.
NOTE: READ THE INSTRUCTIONS. There's some very specific and potentially important information regarding use within. I see pictures of people claiming their units caught on fire or blew up, and perhaps that's true, but I'd not be surprised if they disregarded the instructions or didn't read them at all. For example, after jumping my car my father wanted me to leave the unit hooked up to the battery for a while afterward. But the instructions make it very clear this is not an automobile battery charger, and not to do that due to risk of overheating, etc. People often leave cables hooked up for a while after the vehicle starts when jumping car to car, and I'd not be surprised if some people did the same with this. Read the instructions.