yes all there is normally a battery. Simply put, that was blinking up to 20 minutes, for example. Modified kernel - whichever: D If the modified kernel itself eats the battery, it will eat. If the core is good in terms of power consumption (for example, the Voodoo or Speedmod), then everything is fine, BLN-mode has no effect on energy consumption. In general, I recommend to put a modified firmware, for example, Darky (
http://forum.xda-developers.com/showthread.php?t=814091).There is all-inclusive and optimized as needed.