One battery didn't even work.
580336
I purchased a pair of these and they arrived just before leaving town for work for five weeks. I was happy they arrived when they did as I needed them on site.

One of the batteries was fine. The other would read 'fully charged' moments after trying to charge it.

Now that I've FINALLY returned home, I began to log in to my Amazon account for the return/warranty process, and I'm told that it cannot be returned as it is ALREADY a week past the returns window!

Not impressed.

After reaching out via phone to AMAZON, they offered to extend the return window and have accepted the returned battery. I'm awaiting the replacement. Good service on AMAZON's part, but the product is still questionable. I'm upgrading my rating slightly. Depending on the quality of the replacement, I may again.
313944
I didn't appreciate that one of the batteries had 3 minutes of juice.  This happened once before.  Will probably change brands
3667346
One battery was DOA. The other battery held a charge and I used it for a few hours. However, when I placed it in the charger and nothing. It wouldn't take a 2nd charge.
2267808
Only one out of two of these batteries work. I waited long to report this but I would like another battery because the other one did not work. And now my husband is back to using his old phone since he lost his in the river. Would you please send me a another battery. Thank you! One that works :-)
2970010
3 stars: 2.5 because only 1 of the 2 batteries we received actually worked, and .5 for the relief that it was just the battery that wasn't functional, and not our entire underground fence. Others have commented on the same issue. Consumers shouldn't have to take a gamble and hope that something they paid for MIGHT work and MIGHT keep their pets within their containment area.
4633948
I needed this for work but only one side of the charger worked and only one battery charged. I don't know whether it was the batteries or the charger that had the problem. I returned it for a full refund but the inconvenience it caused for my job made me regret not listening to the other reviews.
1921439
One of the 2 batteries I received in this set worked for one charge and is now dead.  I am using these in Craftsman tools charging them on a Craftsman charger.  The battery was fully charged before using and when power was reduced it was placed in the charger for a recharge and was dead.  The charger is working properly because the other battery charges fine.  Of course this happens after the return window is up so getting one battery isn't as good a deal as what is offered.
3738842
I ordered 2, one was working perfectly and the other had a battery almost dead, had to purchase a new battery.
1114201
Tried with multiple sets of batteries but it never worked.
2309129
Ordered two batteries. One did not work at all, even after charging for 24 hours. Second one works fine. Need to return the first one.
4437332
The battery doesnt Work! I had to returned it and bought another one.
4484247
arrived broken, put battery in but it won't turn on or run.
2344207
Ordered these spare batteries and when they arrived one of them was defective or damaged and they would not do anything to replace the one damaged battery.
993422
The Battery was dead in one of them and I couldnot get the both of them to match my original one.
667969
First Battery was dead and wouldn't charge, second they sent came charged, but won't charge, I may just have to return.
2736323
I BOUGHT 2 BATTERIES AND NEITHER ONE WOULD TAKE A CHARGE. I EVEN TRIED NEW ADAPTER STILL WOULD NOT CHARGE.
3132163
1 of the batteries had a bad cell, worked twice and then never took a charge or turned on the phone.