I am a buyer of King Battery for Galaxy S i9000. My unit still holds even after 4 months by 4 days at low usage.
Standby 58%
WLAN 14%
Screen 10%
etc.
You notice that I do not play around much of the smartphone. I use it mostly for Whatsapp / SMS and Rain Radar. At a meeting, however, also like to use one or the other news app.
The operating system comes with me Darky ROM V11 for use. Although it is based "only" on Android 4.0.4, it runs in my opinion better than anything else I've tested. That was in recent years a whole lot! The "butter" updates the Jelly Bean versions make the menus are still liquid, but suffer the Multitasking and the battery life.
The battery I am really pleased and would recommend him people have no problems with their old. Incidentally, I have not noticed at the beginning on it accordingly and completely recharge. However, I have thanks to the long term generally accustomed myself but to wait until the charge falls below 20% before he comes to the net.