While i was unwrapping the chord, the battery compartment ...
589236
While i was unwrapping the chord, the battery compartment dropped and on the floor. And now the lights don't work. Wasnt even a big impact. Very dissapointed. Will be returning.
2181077
Battery expansion would not allow me to close battery compartment. Because of that issue I could no longer charge battery
Also if you want to find something you have recorded if was very calmcumbersome.
143626
When I went to put in the batteries, there was a hard plastic sleeve inside the battery compartment.  Because the sleeve was bent, the batteries could not go in until I removed the sleeve with a pair of pliers.  In order to do this, I had to first remove the small plastic collar at the top of the battery compartment.  Luckily I had a small enough screwdriver to manage this.  Anyway, my guess is that the plastic sleeve was supposed to be removed before packing the product.  I used it to vacuum the pool yesterday, and it seems to be working fine.
4907570
A spring of some kind holds the moving end to the negative terminals of the batteries. It pops off and you lose the use of that spot on the charger. Two of mine have popped so I'm down to two left. I could probably open up the case and reattach the springs except the case is put together with some odd proprietary screw that requires a tool I don't own and have never seen before. I thought this was a good quality charger when I first looked at it. Now I know it's the kind of junk that has flooded our markets.
1781547
YOU WILL NEED A HAMMER TO OPEN THE BATTERY COMPARTMENT, AND AFTER THAT, THE COVER WILL NOT WORK, WILL NEED A TAPE TO KEEP IT CLOSE.

BESIDE THAT IT WORK GREAT.
252089
I use it while working where the phone is holstered and the battery pack is in my pocket. The cord allows me to unholster the phone and use it comfortably.
4723207
Fell apart when I attempted to change battery.
4027282
While I'm satisfied with its testing capability, I do not like that there is no spring or some sort of tension to hold the battery in place for the split second of testing.
1129357
I  bought one for my Boss ME-25. After using it for about a year I noticed the chord gets a little kinked over time. Purchased this one as a backup just in case...
3401875
When u opened the box, the pin was not attached to the cord, but was loose sliding around in the box. I think I just got a broken one by accident. I tried reinserting the pin, but could not make it budge. I'll have to let the seller know & see if I can a refund or a new one. Thank u so much. I turned right around & ordered another one.
4326344
I would have given it five stars except for: There is absolutely no instructions on how to get to the battery compartment. Fortunately, I found what I needed in one of the reviews here. The bottom on mine was so tight I was concerned about breaking the case.

Otherwise it looks like a great little unit. It will be a permanent part of my camping equipment in the trailer.

By the way the trick in getting to the batteries is to twist the bottom of the case counterclockwise. It will pop off the upper case. Replacing the cover is another matter. There are arrows printed on the case and cover showing the alignment. There is also a tab and slot that must be engaged before rotating the cover to latch it. I just removed the cover to check it out for writing this and it took several minutes of unrepeatable language to get it back on. Too bad this is such a negative for a great unit.
3754945
I got the replacement battery shortly after putting in my order. The shipping on it was the one thing I'm actually impressed with. Upon receiving the battery though I realized when I went to install it it was a very tight fit. It seemed like it was just a bit too big in every dimension. I let it charge for a couple hours till my indicator light turned green and powered up my laptop. I could feel the track-pad as well as the right and left click buttons bulging more than they had with my old battery. When I got to my desktop my pointer was selecting everything, opening drop menus, opening applications from my tool bar, if my pointer hovered over it or came near it good chance it was opened or selected. I instantly shut off my computer and took out the battery and put the old one back in to make sure no permanent damage was done and luckily there wasn't. I'm now waiting for my claim to be responded to on my return.
1191123
When I first started up my Aria, I noticed that the bottom was very hot.  I opened up the battery case and found one of the batteries so hot that it had partially melted the plastic housing.  I removed it and it split open.  I put in new batteries and was concerned that there was a short in the item, but the item worked properly after that.  Chalk it up to a bad supplied battery.
1040714
My cord just ripped off this morning as I was uncharging my cell phone. It looked like a clean  break. Poor reconstruction with poor life span.
2749682
Whenever it is unplugged and plugged back in the time is incorrect. I knew that it was powered by outlet, but I expected some kind of battery backup at least to hold the time so that I wouldn't have to reset it every time I used it
2233964
It was partially broken when i receive it.
The cable is cheap
Issue to proprely connect the battery on it
1002441
The only time I use the battery is when I am out for long periods of time and need to recharge my phone. Maybe a couple times a month, with normal usage. I keep it in my bag while it's charging my phone, so it doesn't get jumbled around a lot or anything like that. I have had it for less than a year and the built in cord NO LONGER WORKS, which is pretty annoying and makes me unhappy with the product. Yes, the battery still works, but the whole point in buying this one was that I wouldn't have to carry an extra cord around with me. I am definitely going  to contact the seller to see that they can do about this.

Take your chances, hopefully the cord doesn't stop working on you too.