I use in Hebrew MIUI rom 2.2.3. The battery is very weak in this version.
How can you strengthen the battery? Is there a to install kernel to improve device performance and the battery? Thanks for helpers
As for the battery drain. Lots of things can lead to that.
Make sure your brightness is on automatic
Make sure you don't have a large amount of widgets
Try a different kernel, depending on your phone.
Wipe your battery stats. So drain your battery to 0%. Till it dies. Plug it in then recharge it to 100%. Reboot it into recovery mode. Unplug the power connection, and go to "Advance -> Wipe Battery Stats"