Great alternative to the OEM battery.
580909
I bought these as an alternative to the OEM battery and must admit that they provide me with what I need. I use a Fuji X100T, and if you're shooting all day, you'll definitely need at least two spare batteries. I love these.
4291164
So far a reliable alternative to the Nikon brand.  They don't seem to last quite as long as the OEM, but with three of them plus the original Nikon battery - I have plenty of charge available at any given time.
4967107
I was Leary of purchasing a no name battery. Once it arrived I immediately compared it to the original and found the specs matched as well as the shape and sizing.
Once installed I did an initial Bios battery calibration and have had no problems since install.
I would recommend this as an alternative to high priced factory replacements.
825235
Nice battery replaces for my old one and works well.
1970093
Bought as a replacement battery and it works great so far.
3322421
Fits my old Ryobi 18v system just like the OEM battery. (This is not the OEM battery, but a compatible)
So far so good. Arrived packed well and partially charged. 1.5hr on the charger and the battery is performing well.
I will see how it holds up in the future, but right now it was a good buy.
1590559
This battery works surprisingly well for a 3rd party supply, and has held up for nearly a year at this point with no issue.
The capacity is better than OEM, but not as high as some that I have used.
I wish I had bought more, because the price has gone up.
4796447
These batteries are great! I recently purchased a replacement OEM battery from LG for my G4 and I would have to say that these PowerBear batteries are pretty close to OEM.  I tested the battery on a normal work day starting from 6:45am to 9:30pm.

I have my phone set on high accuracy mode, Bluetooth always on.  About an hour use of Navigation, Spotify and Wi-Fi.  Did some group messaging throughout the day, made some calls, and light browsing.  I even streamed the last 2 quarters of Finals on my phone with League Pass.  I found the battery to be very good.  At around 9:30pm I ended with 7%.  With a spare I really do not have to worry about my phone running out of juice.

One thing I did notice compared to the OEM, These batteries stay at a constant 74F degrees.  I find this very odd as the OEM one starts around 80F degrees and goes upward towards 100F with normal use.  I am not sure if the OEMs are messed up but I read those normal temperatures for the G4.

The Battery charger is pretty awesome as well. I can charge my phone and the spare at the same time on the same plug.  With a 2 year warranty and how long it has lasted me throughout the day, this cant be beat. I will update this post if I notice any changes in the battery.

I do use Greenify and my phone is rooted running custom ROM.

I received this product at a discount or free in exchange for my honest and unbiased review. I have no obligation to leave a positive review, and put in effort to give reliable feedback that will be valuable to anyone considering purchasing this product. I was neither paid nor sponsored for my opinions and all views reflected in this review are solely my own.
2990290
This is a great replacement battery. Aftermarket batteries always make me a little curious so this one i did a test with. I disassembled it and looked at the individual cells that make it up. While they are not name brand cells, they are some Chinese brand. They all did test well over 2000mAh which is spot on where they should be.

I received this product at a discount in exchange for my honest review.
698671
Saw the $6 option for the battery that didn't quite "fit" in the battery housing and thought, "this can't be good," so I kept on researching and found this option. Sitting at 2:21hrs and I've been on it for about an hour. So, seems to be better than the original so far.

Just got it out of the box, guess we will see how long it lasts.

(this is the second replacement battery I've bought, the first one from Apple only lasted about a year).
3240142
Great replacement for my OEM batteries, actually more power!
1981812
Great value and alternative to buying it from the Apple store at an inflated price! The package it was delivered in was secure. The tools it came with was helpful. Following the installation instructions from iFixit.com made the battery swap process effortless and last only 15 minutes. I've only had the battery for 3 months, so it is a bit early to tell if it able to stand the test of time. So far, no glitches and it holds the charge very well. I notice the battery charges to capacity very quickly. It's hard to tell if the battery charge last longer than the OEM battery that was initially in the computer.

I will seek this brand again for my future laptop battery needs.

UPDATE 9/18/2015- The battery has now deformed it's shape. imposing itself upward on the trackpad which prevents me from depressing it enough to elicit a "second button" command. because of the battery bullied, I now have to plug in a mouse as a work-around until a get another replacement battery, or replace my aging laptop altogether.

Batteries should not be designed to warp. Be careful what you pay for. i would pay full price for an OEM part next time. Lesson learned.
2980934
Much cheaper than buying a replacement battery directly from Verizon.  Actually, I think it was about half the cost.  I'm glad I checked to see if there was an alternative to purchasing the battery elsewhere. Works fine and does the job it is intended to do.
1782747
Love having a spare, good quality OEM battery. The USB connection allows me to charge in the house or the car.
2593600
Replacing the OEM battery with this third party battery was very easy. This battery also holds more power than the OEM battery which lets the MacBook Air to last longer than usual.  However I did not use the provided tools that came with this pack because I had my own tools and read from the previous reviews that some had problems with the provided tools. Just make sure you have the screws matched accordingly because they all are of different lengths, but otherwise removing the screws and the circuit tab is really quick.
4480484
After two OEM batteries failed to charge after a surprisingly short period, my attitude was " If OEM batteries don't last, then there is no advantage to buying another one".  I usually buy OEM, btw. I have been very pleased with this battery.  It holds a charge as long or longer than a new OEM.  Even if it only lasts as long, I saved money.
829056
Fit's perfect, and my initial tests suggest that it has considerably higher capacity than the original OEM batteries, even what I remember from back when the OEM batteries were new.  I'll update this after I've used it for a while.

Addendum:  Ok, after using these for a while now, I can say that they are in fact way higher capacity than the original OEM batteries.  I'm not sure what the overall longevity will be, but I'm very happy with the everyday performance.