Have you used it? I did just last month while at Walt Disney. I got it for 20.03 and thought what the heck. I had a competently dead battery, my son left the dome light on and after 2 1/2 days it drained the battery that even the doors would not unlock with the remote, and it was hot as hell in the 90's.
I hooked it up to the battery pressed the button and let it charge it up. I jumped the gun 5 minutes in and tried to start the car but no go. Pressed the button and let it do its job. Had the wife go back up the the hotel and borrow my moms car and jumper cables and pulled he car around to jump my car.
Before I pushed my car out of the parking spot I tried to start it just to see if the car would start andIt started right up didn't need the jumper cables.
for 20 bucks it worked out for me. Took like 10-15 to do its job and it's very compact
negative, i dont even own it, so i have not used it. for a penny i would be all over it, for sure. i was very excited to get them bc i had a store with 10 or so that were out of sight out of mind, but they jumped back up to full price after a month or so at .02.
theres no way for sure to know exactly what it can/cant do bc of the lack of specs. theres all sorts of variables that would determine if it could be useful or not. the smaller the vehicle and less electronic equipment the better off you will be with the b&d or a small agm pack. also the battery voltage is critical too. ie in your example: your locks likely wont work if your battery is at 11.9v or even as low as 10.1v... so without the voltage read before/after theres no way to know.
if your battery is no longer capable of holding a charge the b&d isnt going to jump it bc it (likely) cant put down enough cranking amps (or cca's if its cold). the fact it took 15min and wouldnt start after 5min instead of 1st try 10 seconds after you hook them up is indicative that the cranking amps spec is low on the b&d.
fwiw, pep boys was giving away Peak brand 300cca jump packs with inflators attached to them for free, plus like $10 cash back after rebates making them better than free on black friday for a couple yrs in a row. the going rate on those is roughly $20 ish any day of the week and the package is maybe 2x the size of the b&d but includes the inflator, which is very good, and also some clear specs defining what it is that you are getting.
the b&d's original price of $70 or whatever is insanity, $20.02 should be the going rate for it
ps last thing to consider: the b&d was probably out of action after it charged one battery, agm would probably be ready for rounds 2,3,4+ before it even needs to be recharged
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you've seen them too huh to heavy for little profit, Already have a Harbor Freight cart with two welders on it anyway.