This battery became instable within 2 usages and my balanced ...
358509
This battery became instable within 2 usages and my balanced charger would not accept it.  I had to throw it out.
624897
This battery provides a HUGE increase in battery life and was very easy to charge while in use as well. I have so far been able to record up to 4.5 hours with this battery fully charged. Note that the extra battery does come with extra heat, but so far I have not noted any serious detrimental effects from this.

I highly recommend this battery to anyone who has face the dilemma of not being able to start/stop the gopro over several hours of activity, change batteries, or predict what moments will be most critical to record. I have used this now for several 3+ hour flights without issue, as well as charged it while recording using vehicle 12v/24v chargers.
3177572
Don't judge this battery on the first 2 charges.  By the time i completed my 3rd full charge, the battery has been operating like when my phone was new.  I was down to about 20 hours on a charge on my 30 month old OEM battery.  This battery has me back to at least 48 hours with my amount of usage.  Writing this review on the phone since i am not afraid to use the phone more now ;)
3937571
I have had this battery for three days now and, so far, it holds the charge very well. I go all day long with moderate usage with checking email all the time, listening to music, and watching YouTube.
My Note 4 is almost three years old and the original battery started giving up. I had to charge it several times a day, which is not a problem. However, the phone would spontaneously reboot when the battery level approached around 30%. Or I would have 30% battery left and then in minutes I would have zero!
I ordered this zero lemon battery and it gave my phone a new life. It is so great to gain back the confidence in my Note 4, which is still a very capable phone. I am so happy I do not have to replace it just yet. As I said, I had this new ZeroLemon battery for few days and let it discharged to 2% and it perform very well on the low percentages (the phone did not reboot  as it is with my original dying battery).
I will update my review after few months of usage. I hope that the battery continue to perform!
The seller has an additional 6 months warranty if you register for it. I did and now I have 12 months warranty.
2888702
I didn't buy this battery to use lightly. This thing was used every day all day for about two weeks straight in a reciprocating saw and didn't miss a beat. Had to charge it a few times of course but it never got weaker or super hot. I was really surprised at how well it performed. I am definitely buying again soon.

Update: I used this battery along side an old dewalt battery that was already pretty weak. This battery out performed the dewalt by at least 20-25% more. Until one day, it just quit. Now it doesn't work AT ALL. The dewalt is still kicking despite being tired. If it had lasted a year, I woulda gave it 4 stars. It only lasted a few months...
1208856
Bought this just over 2 years ago. I worked okay for about the first year, although I noticed progressive amounts of warping and slowly diminishing battery life. In the 2nd year of life it was of very limited use, couldn't even watch a whole movie on my laptop. Now it's so warped that it will not fit in the battery compartment and is of no use.

[Update Aug 2015]
As you can see in the comments on this review, Anker reached out to me to help. They provided a brand new battery free of charge. This is great customer service and the sign of a company that stands behind their products. I do not yet know how the battery will hold up over time, but with this second battery I will have gotten very good value for my initial purchase. Thanks Anker!
4175451
started right away and no problems when the battery sat for 2 weeks with TEMP.s at 25 lo and 45 hi
201620
I bought two of these batteries and have been using them regularly for acouple of month.  Although initially I was able to charge them at a low level and still get performance, I charge them at max voltage and they still perform.
4268720
Have used this battery for two months now. I start and stop frequently so I am cranking my older Polaris numerous times while out on a typical two - three hour ride. I have checked voltage randomly and it appears stable so far. Have a more expensive battery in another ATV that went bad in two years . If I get that time from this battery would be happy. Hope it lasts longer of course.

This is a sealed "maintenance free "  battery..
3411579
I have had the battery for about a month now, and so far I am beyond satisfied.  I replaced the original battery for my mid-2010 13" MacBook Pro.  I made sure to condition my battery as it was recommended by a few online tech websites.  The tools that came with the battery are nice and easy to use.  As for performance, I can say that the battery has held a long charge easily for a month now.  It took me a little while to get used to it, as I was used to my old battery lasting very short periods when not plugged in.  Once I was used to the new battery, the charge felt like it did when the computer was new.  I will update again if anything changes, but as it stands I would recommend the battery to a friend.
3164920
I have been using this battery for a number of weeks.  I have been able to use it for two to three consecutive days without having to charge it.  I travel quite a bit in my chair as iWork three days per week.  I use my wheelchair whenever I leave my apartment.  The charge Lasts (and I roll at my highest speed!). I am extremely pleased with this battery.  It was worth every penny.  I can now enjoy the summer concert series without worrying that I will run out of juice before I get home and can travel more for work purposes.  A Big ThumbsUp!
3601861
This battery performed just as advertised!  My HP G42 notebook was such a power hog (may it now rest in peace) I had to purchase this extended battery for me to be able to sit through a 2 hour lecture; the stock battery that it came with just wasn't cutting it. With the this battery I was able to get an approximate 2 extra hrs with light usage (Wifi on, MS office running, web browsing, and limited video streaming) which was enough to get by when not within range of a power outlet. The reliability was optimal as I didn't notice a drop in charge memory for the life of my PC. Another plus, the fact that the battery protruded from the bottom put the notebook at a slight incline that made typing more comfortable. Overall, very pleased with this AGPtek product!
3126504
I was in a bind with my IBM Thinkpad R52 as my battery was only at 33% of initial capacity.  Once I received it, I was alarmed because the battery looked different.  After a bit of wiggling I was able to get it to line up correctly and it slid and locked into place.  The laptop is even bulkier now but I don't care, it hold charge.
3296287
I bought this 2500mAH battery since my original battery that came along with the phone didn't last for any more than 30 mintues after 3 years of usage. Now, I get around 6 hours of talk time with occassional GPRS usage (about 20 minutes per day). I waited a while before posting this review to ensure that I have had atleast 3 full charge cycles of the battery done. It seems to be consistent. I would recommend it.
3666084
I just purchased this battery and i'm completely happy so far. I had it for a week and it's holding up well. I was anticipating the worse but in this case it was the best move i made in a long time.
2367535
I received this replacement battery yesterday. My old phone battery, after two years of use, made my phone in a really bad shape. Pictures weren't beautiful, dull, and not natural, and the phone shut down at random times and every time I try to use the camera at 50% or less. Last week There was a rare natural view that just happened in front of my eyes, my phone's battery was 30%, when I reached to take a shot, the phone (the battery to be more accurate) just decided to shut down and not work again at that moment. You can imagine how frustrating that was. The new battery resolved these two issues. I can use the camera without any problems and the quality of the pictures returned back to be nice as it once was before having troubles with the old battery, and I can work on my phone at 2% battery life. For now I'm very happy with my purchase, but as I said I just received it yesterday, so I will wait and see.
Two things I noticed since yesterday though, but may not be very credible since I experienced them once so far. First thing when I used the new battery my phone instantly became hot to the touch and stayed like that for about an hour. The second thing is that I charged the battery to 100% this morning and didn't use the phone, and in about 10 minutes the battery reached 90% but then after that it lasted for 7 hours with a good use of the phone and apps before having to recharge it again.
4601981
Balance lead is a bit long got chopped off from quadcopter a couple of times so had to toss it eventually.  Battery performed pretty well but did dip in voltage quite a bit (could have been due to cells shorting the first time the balance connector was chopped off... Hard to say). At least half user error though I'll admit and have had good experience with tattu batteries overall.