Cayenogenmod 9 Battery Problem ?

Hi everyone !
I updated recently to Cyanogenmod 9 from ICS 4.0.4 and when i installed it , the application wordweb would take like 1% every 10 minutes of usage but after i shut it down and recharged it , the application now eat 1% every 3 minutes , although i don't have Wifi or Bluetooth or GPS or 3G or Any kind of connection , i even set the CPU at 300 min and 600 Max but same thing , although when it ate 1%/10Min it was set at 300 min and 800 Max ! i think the other application made this problem for when i was re downloading my apps i found some already downloaded so i thought maybe they brought back some files or the older system ! if this is the case ? how can i completly erase the recovery files so that they don't get back again !
and do you know any tips to extend the battery life ? because even at idle usage the phone uses like 2%/1hour when at my older ICS it went down to 1%/3 hours !

Im going to flash Cyanogenmod 9.1 from my current 9.0.0 : how should i do it ? like i did it with the ICS ? or i just copie and update from SD card ?
Thanks

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