Top positive review
Compact, powerful 18 Ah unit.
December 30, 2018
Haven't needed to use this portable jump starter for a real emergency yet... but I tested the emergency battery jump starter on my 8 cyl, 5.9 L gasoline truck by temporarily installing a known bad (discharged) battery. After confirming that the bad battery wouldn't even turn over the truck engine, I set up the jump starter, and after pressing the little reset button on the connector itself (which then changed the color of the LED), the truck started right up on my first attempt!
No idea how long the batteries in this unit will keep their charge (instructions say to charge every three months to protect battery life), nor how low the unit's charge might be and still start a vehicle (mine still says 100% after starting the truck), but the overall compactness and the included case, charge and USB adapters and the battery jumper cables all seem to be of better than average quality.
I figure that -at worst- this unit may quickly help me by charging and powering my phone in order to call for more help!
Ended up buying five units as Christmas gifts for each of the family cars. PS: The only photo I uploaded was of the dim headlight when I was making sure the truck's battery was "too dead to start the engine".