I bought this jumper battery because my car was stuck in the garage, and I couldn' jump it with another car. Even though it said to charge it for 36 hours after purchase, I used it anyway right out of the box, and it started my car twice. I like the fact that you just leave this thing plugged in all the time and it knows how to keep the charge on the unit, and, as it claims, "intelligently charge" as the label said the algorithm is smart enough not to overcharge. The LED flashlight isn't very powerful, but guess what, in a pinch this light would probably last for days if not weeks on that huge battery. The compressor was a real bonus. I used it right away. It is very convenient to check your tires, sine the unit is not tethered to an electrical outlet. It took about a minute and a half for my tire to go from 25 lbs to 35 lbs. And after I did 5 tires, it quit on me and the tubing got hot. I read the instructions and noticed that compressing sucks a lot of power from the battery, and that you shouldn't use the compressor for more than 10 minutes at a time. So I had to wait half an hour for the unit to cool off, and then pumped the other 3 tires on my other car. This thing makes it VERY convenient to pump/check your tires. The built in pressure gauge needs to be angled upwards a little bit to be more user friendly, bc I had to keep tilting the unit to be able to see the pressure value while it was sitting on the ground. The compressor is something I'll be using quite a bit. The jump start feature is nice for emergencies and road trips, and the 12V cigarrete socket and USB socket means this thing can be used as a general purpose battery. It's the biggest battery I have in the house, so it's nice to have it.
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