We all know the battery on this phone suck. I am able to get a full days worth of use if I limit my use on the phone. For most of the time that is fine, I can do that. But there are some days where I am out on the road and I need to use this phone for more than making phone calls. So I decided to buy an extra battery. OEM samsung battery are about $40. There is no way that I am going to spend $40 on a battery. So I checked out ebay and they had a kit for about $10 with 2 batteries and a independent charger, meaning you can charge your extra battery outside of the phone. The battery itself looks well made, it did not look like a generic black battery. It looks just like the OEM battery that you get, but instead of saying made in China on the stock battery it said made in Japan finished in China. I know tags don't mean much because they can put just about anything they want but the point is it looks nice. Since it was shipped from Hong Kong it took forever to get here, about 24 days. But it was well worth it. The battery life seems to last longer. I don't have any scientific proof but it does from the 3 days that I had it. I am going to admit that I will not carry the extra batteries with me everyday. I will only bring it when I know I need to use the phone off site of work. I know it is a PITA that you have to carry another battery with you but I see it a different way. I can use the phone without worrying about the batteries dying on me.