Only got one battery, in less than a week ...
922639
Only got one battery, in less than a week of having it in my watch it went down to 14%.  All other batteries Ive purchased else where has lasted at least 6 month.
2971547
Only one of the batteries holds a charge.  I gave this as a present to my father, and the first battery that he tried worked fine.  He recently tried to use the other battery, and it did not hold a charge, and now that it is past the return window, we may be SOL.  Hopefully not as the first battery worked fine, why would we automatically check to see that the second battery held a charge right away???

I will update this if the seller can make right on this issue.
4699858
One battery was fine.  The other would not hold a charge, and lasted a fraction of the other one.  Returning for a refund.
3283370
This is not so much about the battery as it is about the supplier.  The first battery never worked and appeared (very) used so I had to wait for 2 additional weeks whilst they resent another.

Second one now works but I had already bought another phone...
3305658
One battery good, the other one would not accept a charge. Returned them. Probable a fluke! Going to repurchase, but will buy one at a time to make sure I get good batteries.
3836249
I only wanted a spare battery but getting the charger and screen protectors  at a cost of a new battery alone was icing on the cup cake.
1478500
Only needed one for a project I was working on, so figured two was a bonus.  Unfortunately, neither worked.  Seems to be a short someplace in the bodies.  Ended up going with another battery option so I didn't need these.  Not worth the effort to return, so I tossed them.
3240507
One battery out of two given, holds a charge for 15 minutes then dies. Charged it all the way. Seems others were sent the same Shyt.
4033806
When got product had only one battery unlike description states, also no paper work with details and information on adjustments or even way look up information. So far I'm considering returning product .
17962
Purchased as Christmas gift, only one battery cover was included.
2780368
Quick delivery.
Battery only last one hour before requiring a new charge.
1648136
Bought this battery because the reviews weren't filled with accounts of customers having failures after the first month.  Unfortunately, "critical battery failure" less than a week past the 30 day return window.

*update* I contacted the company who manufactures the battery and after a little back and forth they sent out a new battery and shipping to send the old one back.  I only hope it lasts longer than 5 weeks this time.
3363887
Received batteries with in one week, one worked fine and held charge for a week. The 2nd battery only had a charge for 1 day. Called the Company and they sent out a replacement, no questions ask. Very pleased with the customer service.
3058017
The batteries are great, however they only worked for one of the two items I ordered them for, even though the same size worked before.
897144
This battery was initially working but after just a week, it would no charge and was completely dead without being plugged in to an electricity source. I have requested for a replacement. I hope customer service is effective.
3842869
Battery replacement was easy enough, included tools are fine and appreciated.  But the battery itself lasted only a few days. It appears to either have been close to death, or it could be (as others have reported for this very same item) shorted out internally. I'm too lazy to tear it apart to see, the return period is gone (it'd be more expensive to ship back than buying another anyway).  I'd look elsewhere for a better battery replacement.  Don't bother with this one.
3231700
The description made me think I was getting the 2 pack as these batteries usually come.  So I thought this was a great price.  It turns out there was only 1 battery (what could I do with 1?)