Top critical review
Did not work when I needed it the most
Reviewed in the United States on August 16, 2020
Piece of junk... Just got home after jumping my car with a set of backup cables.. if you carry this thing, make sure to have plan B. I've had this unit in the back of my Jeep for about 9 months and when first turning the unit on, it claimed it was 100%. Upon connecting my vehicle this dropped to 55%. I understand the instructions say to charge every 3 months so this is my fault however it should have worked above 50%, minimum 30%. Upon connecting it to my battery, the adapter flashed red/ green. After looking up instructions on the side of the road, I find it's saying to push the "booster" button. This button does NOT exist on my unit whatsoever. The cables I was shipped with this unit connect however there is no button on the side. In fact, the red and green flashing lights come from a little LED screen and not a single LED as other reviewers have said. There is no way to press boost, and therefore this thing was absolutely useless. Thankfully I had a set of jumper cables and I was able to get a jump from one of my friends. Very glad I wasn't left stranded in the woods somewhere.
I would research better quality units instead of this piece of crap.
UPDATE: Dug through my manuals at home. Found the manual for this exact unit, which states that alternating red/green flashing means Reverse charging protection was enabled (See photo). There is no further instructions on how to disable this. Essentially my understanding is that the jumpstarter prevented itself fom taking on charge from my car battery... Which was dead! How am I supposed to get this to work? Tried calling customer service, no answer, and also chatted via Facebook messenger, no answer there either. Will be pursuing a refund with Amazon if possible.
2nd UPDATE:. So I was able to get this to work sort of consistently -- once hooked to my positive and negative terminals, since I received a flashing green and red light ( see above) I found I can turn on my headlights for a split second to pull a decent draw and cause the unit to recognize my battery needs a charge versus it receiving any juice and going into reverse charge protection. So a quick flick of the headlights on for a second, then the light should flash green and you should be able to start the car. In the midst of this I installed a new battery, and will hold onto this. Nonetheless my review stands, due to the lack of coherent instructions, and absolute lack of product support.