Prime Members: NEXPOW 4000A Peak Car Jump Starter w/ 60W USB-C Output Expired

I applaud your persistence of using it 60-300 times instead of getting new battery but for me that's a bit on extreme side. One thing I learned from certain companies and products on Amazon is that they keep selling it until they start getting too many complaints about issues and switch to a different product and majority of the time won't stand behind their "warranty" terms either. Bought two of battery jumpers like these and for both within a year the listing page was gone, similar case with dash cams which I have already 3 that are not working properly and became ewaste instead.
It also shows capacity as 88.8 Ah which is big stretch for something that weighs 1.5 lbs including plastic and internals besides cells, it seems nowadays they try to claim as high as possible rating since I don't think most will check anyways. It's fairly easy to determine true capacity by running it down with constant discharge and noting the time it took to die.

The issue was that since the starter, battery, and alternator tested as passing ... I had to wait until one failed. Eventually, it was the battery. Took my car to AutoZone and O'Reilly's a total of maybe 6 times before the battery showed as bad. It is what it is. $30, and I have it fully charged for the next time I or someone else needs it. Sorry if you have had a bad experience, I think we can both have our own experiences, and both matter. Thanks for posting.

I placed an order myself - $50 seems like a great deal. I used the "late delivery" choice for Thursday, next week so I could get in on deal and *then* decide if I still wanted it. That said, I started really reading the reviews on this, and yikes... almost every good review is a Vine Customer Review for a free product. I looked at the Verified purchases that were NOT Vine freebies, and they weren't so good. Seemed consistent that the unit had a cheap feel to it, and the 4000A claim was overstated... it was not jumping cars/trucks that probably would get started with a better 2000A or 3000A battery jumper (I guess, think NOCO or Gooloo for ex - personally, I have a TopDon 2000A I got on a SD FP deal, and that thing has been great).

The above said, I think I'm going to cancel my order. $50 is a great price, but I'm starting to think it might be better spending $50 *towards* a better $60 - $70 unit. As somebody else said in an earlier post, who is actually verifying these Amperage claims? These generic Chinese brands have a habit of grossly overstating lumens on flashlights, for ex, so, I'm thinking this charger's 4000A claim is also probably vastly overstated from what I read. I even took a look at the NexPow 5000A charger... that thing should be amazing, right? Should start a Peterbilt... but, the reviews on the 5000A charger also had a bunch of people stating that it wouldn't start a bunch of different vehicles. The other thing I noticed, even though this is supposed to PD fast charge, there were a bunch of comments about slow charging and other comments about the battery losing charge too quickly. So, I just cancelled my order.