Great battery but beware that does not last a long time...
345273
Amazing battery, but only lasted me 9 months...I will give a try one more time. Hopefully, the battery will last me longer.
3662520
I bought this replacement batter over a year ago. I take my computer to work/school daily and do not leave it plugged in for extended periods of time. My first battery lasted for almost 2 years. This battery was amazing for about 6 months. After that, I am lucky to get 1.5 hours out of it. It was pretty cheap so I guess it wasn't a total loss.
1775757
This battery seemed to be working great in my Evo4G the first day before I even charged it. Its %90 charge lasted nearly 24 hours with moderate use. I left the battery to go down to %20 and then charged it to full %100... after unplugging from charger, the battery charge went down to %82 in a matter of 3-5 minutes, and it definitely did not last more than 10 hours with similar moderate usage. I wonder if I've also received one of the 1500mAh batteries other reviewers seemed to complain about
1749678
I was looking for a replacement battery for my asus eee netbook since the original battery was completely dead and held no charge what so ever. I bought this one and as expected, it fits the netbook and worked well...for a while.
I bought this in october 2014, its now april 2015 and when the battery reaches about 40% (im using windows 7 starter due to the latest events with windows xp) the pc shuts down. When i reboot, the battery is shown as it has reached 0% charge. Is this battery showing symptoms of dying out after 6 months of use? I think thats a bit soon.
3277248
Less than 8 months and here I am on Amazon again purchasing a new battery.  Perhaps its my phone or settings but my original battery lasted almost 3 years.  This one started lasting less than 12 hours in 4-5 months but I just kept charging it more and more.  Could be my phone.  But I'll do that next test with a different battery than this one.
3416643
This works great at first, cable is just the right length, and holds a good charge.

The problem is that the battery on mine is already dead (bought it in January 2014).  It only will hold about 10 minutes of charge at this point.

I'm guessing that there was just one or more bad batches, because it should have lasted much longer than this (my xbox 360 play n charge lasted forever).

So as long as this works, it's great, but be aware that this didn't even last a year in my case.
1319510
I loved the battery when it first arrived, and for the price, it was a no brainer. Now, a few months later, I am stuck with a dead battery and can't get my motorcycle out of my garage.  What in the world did I get myself in to?  I think these batteries have a 17-month warranty, so hopefully I'll get a replacement for what seems to be a defective unit...
2361845
I purchased this battery the first week of march 2015 and at first it worked great.  Had more power and lasted much longer than the Black and Decker.  Then after only two months of use and maybe 6 charges it would not fully charge.  Charged to about half its original power and went dead in a matter of minutes.  Amazon only warrants this battery for 30 days.  My experience is a good battery will last 4 or 5 years and slowly lose its ability to hold a charge.  I have contacted the vendor to see if they will replace.  Results pending.  I just received an email from Amazon authorizing a full refund.  I also received an email from the vendor offering a free battery to demonstrate their good will and compensate us for the inconvenience they had caused us.  Now that's customer service!!!!  The new battery is working great.
2915958
Before this battery, I was CONSTANTLY looking for, and tied to, a charger. After the phone being unplugged for 2 hours, and used for Bluetooth and video for 1.5 hours, phone would be at 55-59%.  I would CONSTANTLY charging the phone.
Now I charge it every other day, as the battery typically lasts 2 full days.
Yes, it is big. However, I like the added size, as it makes it easier to handle with 1 hand.  The case is a nice fit as well.  I have already recommended this battery to my buddy who has the same phone. I'd buy it again.
6.22.16. Originally I LOVED this battery.  However, it has only been 4 months, and this battery has gone from lasting nearly 48 hours, to not lasting 18-20 hours.  If this battery could retain its power for more than 3 months, I would give it 5 stars.  However, to lose the ability to hold power in a mere 4 months is a bad statement on production quality.
4433153
The battery does last for a long time - my biggest concern is that when it is left with 30%-40%, it dropped to 0 really quick.

Let's see whether it will hold power in a few months.
2983712
I bought one of these batteries about 6 years ago and used it as my second battery, swapping it with the primary when it ran low.  I took about 7 trips and made extensive use of it then, and sporadically across the years in between.  Overall, I found it to perform just as well as the OEM battery.

The battery didn't wear down gradually.  It was a matter of just a few uses where I noticed a significant drop in the amount of time that the battery would work.  Still... 6 years is a long time.  I am taking a chance with another set of batteries that comes with a tripod accessory, but have a feeling I might regret not having bought another one of these.  ;-)
3044772
Nice battery but they seem to lose there charge when not used and take a longtime to charge. Other than that still a good product. Always keep more than one on hand!!!!!!!
425870
This battery really did extend the life of my phone more then double. My problem with it was that it wasn't durable, it broke without ever dropping it. over time the bar that held the battery in place also broke. You may ask then why i am giving this 4 stars. Well the company provided great customer service and quickly replaced the broken parts. Also, I don't keep the battery in all the time. i take it off and put it back on as needed. so my use of the battery is more then its intended for. Also it did the job like it was supposed to, extended my battery life during times when i didn't have a charger
3949249
My Dell laptop is no longer supported by Dell for the batteries and I figured after 4 years the original battery (6 cell) was only holding a charge for a couple of hours.  I figured the 9 cell would last longer and I'd get battery life like I used to get with my original battery.

I will say that the battery came quickly and was well packaged.  The battery works.  But the life is disappointing.  High Performance, not.
3388105
This battery may live a long life; however, the odds are that it won't. There is a well-understood rule that automotive batteries shouldn't be purchased if they're over 6 months old. This is due to the self-discharging of the battery bringing the charge level under what's good and healthy for long-term storage of the battery. If the battery is at a low state of charge for an extended period of time, a chemical reaction happens that shortens the lifespan and ability for it to perform well under load. This is not good.

This battery arrived with a date code of June 2015, showing it to be 16 months old. The charge level was under 25% (not good!) when it arrived, and my battery charger took roughly 30 hours to bring it a full state of charge. After contacting Amazon and them issuing a partial credit, I will be keeping the battery. A warning to those who purchase here: they won't return it unless it's defective. Unless it's a great deal, purchase through Autozone or Sears if the "freshness" of the battery is important. Amazon is great, but they have old stock in this battery, and I would not have purchased it through an automotive parts store with its age. Boo for the old stock and yay for the Amazon customer service.
645344
This battery worked great for right at 11-12 months, and we only use our Dyson maybe once a week. Now it won't stay charged for more than 30-45 seconds. It looks like others have had the same issue with longevity. Disappointing..

**update**
Powerextra contacted me right away and sent me a free replacement. This new battery appears to work much better, so for now changing my rating back to a 4.
2789179
I bought a Ryobi drill and have had 2 of these batteries.  1st one stopped charging at 8 months, second one currently holds a charge for about 2 minutes then dies and will not charge any further.  I have had the batteries for about 15 months.  I am a DIY'er/ home owner and only use them occasionally.  Pretty disappointing to spend the extra money to get a so called "high quality" battery only to have it fail in such short order.  My older Ryobi batteries lasted for close to 5 years before dying.