Something funny here, since Razor scooter charged batteries always always ...
593955
Still have not figured out whether this is correct.  Charger on PowerRider new battery continues to remain on Red button regardless how long charged!  Typically when charge is complete, charger light should  turn green.  Something funny here, since Razor scooter charged batteries always always turn charger light green.  I don't know if battery has a full charge no matter how long is on!  If this battery does not perform or provide the service  I am not going to be happy!
1998552
Easy swap out of the old battery. My son now can ride is Razor Drifter go-kart. I would note that the batter pack only last about 20 - 30 min before the power level degrades considerably. I am fine with that but I feel the description should have more realistic times posted.
4761610
I connected it to my disconnected Jet ski battery and left it over night. The next day the LED was still red and the battery cooking.
That is certainly not an automatic charger or I got a broken one.
2803533
It charges. What else can a person say about it? I love Ravpower products in general.
4723783
Nope. Had this for about 6 months, going on 7, when I noticed two things. 1. The batteries I charged in this just weren't staying useful as long as usual and 2. Every time I went to charge my C cell energizer NIHI batteries (bought at the same time as this), they would randomly blink "Bad". If I shuffled them around, it sometimes worked, sometimes didn't. Now, there's nothing wrong with the batteries. I SERIOUSLY doubt 6 energizer rechargeables would go bad at the same time (based on past experiences with the brand. Some of theirs I've had over 5 years without problems.) Even if by some bizarro coincidence they all went bad, shuffling them from one port to another shouldn't fix them, but does. That tells me the problem is the charger, not the batteries. For lack of better options, likely going to swap back to disposable Cs for the trash can. Ugh!
1161873
A few weeks ago I used this on my dead battery after someone (maybe even me) left the ceiling light on in my car. I had to override the fail safe feature with the "!" button because the battery was completely dead but to my surprise it worked and turned the engine over. The fact that this charges via USB-in is kinda unique among these things and means I can charge this from the cigarette port, an outlet, or even a solar panel in the middle of nowhere.
163256
I never run out of batteries!  The 12V charger is a nice touch :)
3341313
No complaints here. They charge up no problem, they run the scooter without problem. I will buy again BC I have one more scooter to fix.
511955
... when the battery is very very low, this charger refuses to charge it! Instead, I had to use an external automotive battery charger to bring the battery back up from "really low" to where this unit would accept it. This was quite unexpected! I thought this charger/inverter would happily charge any battery that could be charged. Some very generic off-the-shelf automotive unit had no problem bringing back the 130AH deep cycle marine battery I had hooked up to this thing.  I expected more from Tripp Lite, a respected name in power & charging.
1316088
I ordered this product to charge my car battery.  I had previously used manual chargers on this battery with success.  This charger promises automatic capability and diagnostics on your battery.  Upon hooking the charger up to the car battery, diagnostics produced an "Open Cell" diagnosis, it would not charge at this point.  I replaced with a brand new battery.  The new battery works fine in the car.  When I hooked the charger up to the new battery to see what it would say, same diagnosis, "open cell".  Battery obviously is not the problem at this point.  Tried hooking charger up to my lawn mower, same result "open cell".  The lawn mower battery has been working fine.  I have no option to override the assessment and still charge the battery if I want.  I believe the battery I replaced probably was still good.  Don't believe this unit diagnosis, costly mistake.
3381099
Batteries last a long time in my IKEA hand mixer/whip. t would be nice if the charger had a 120V outlet so the user doesn't lose that when the charger's plugged in.
648704
The batteries, oh the batteries... this has to do with Energizer's stupid and thoughtless packaging... imagine the + and - surfaces of the button battery both touching the same aluminum packaging foil. Actually, no need to imagine - it's exactly how they're packaged already by the Energizer factory. Dead batteries, anyone? Luckily they're small and die quickly, otherwise they'd get hot and catch fire. Who at Energizer designed this? All they'd need to to is flip the batteries in the blister, so that the only thing the aluminum-backed foil touches is the + side... no need to do anything else...  Energizer, any bright mind at your facilities willing to take that up?
2742063
Since I previously had the 80v snowblower and battery, now I can just swap batteries and keep going, as the charger(s) will re-charge batteries as fast as I can use them.
3874164
Product works as represented. Word of caution; if you are replacing the battery of an older Razor cell phone be sure to stop charging when full! The older phones will destroy batteries prematurely if you overcharge them. I found this out the hard way.
2817071
With a spare battery and this charger, my cell phone is always ready.
14994
I bought this to hook up to my scooter (my car and motorcycle already have hookups), and it works great. No complaints at all. If you connect the connections backwards, your battery tender will tell you and you can just reverse the leads. Very simple to install and keeps your battery topped off whenever you want to go for a ride.
3707391
We experienced all the same issues as those unfavorable reviewers and ALL our issues were eliminated when we CHANGED THE BATTERIES!!

I admit, I have never encountered another electronic toy that responds to low battery power like this.  I absolutely thought the toy was defective but, as it turned out, new batteries were all it needed.