I was having problems with my Galaxy Appeal phone i827. The battery wasn't staying charged. I went to the local battery story to buy a replacement and it was $40 and would take 2 weeks. I saw this one on line and it not only fits perfectly, stays charged and is exactly the specs needed to replace the original. The cost was half, it arrived in a few days, and is working just great. Be careful that some other cheaper ones say they work with galaxy appeal, but they really don't fit right.
Anyway, this one worked great and has a warranty for a year.
This was a replacement battery for my phone that wouldn't hold a charge longer than a few hours. This replacement worked great and battery holds charge for a few days now. This battery seem it is an international shipment so allow for some extra time for delivery of the battery, but worth the wait.
I bought two batteries for each of my family Samsung Galaxy Y Dous (GT-S6102B). Before writing this review I wanted to give the batteries a real day to day workout including WiFi, and use of the camera. It has been three months and both batteries have performed better than expected, holding their charge as long as the originals.