^^^ I have deleted Nandroid backup folder. SD card was full.
lol
How should I go about installing another ROM?
Do I have to reformat the memory card and reinstall Custom Recovery?
You don't have to reinstall custom recovery again in future.
If you are installing new rom, check the developer post. He must have added steps which partition to use. Most of the roms works on ext3 partitions. if you are using the same partition which the new rom support, just wipe all and flash. No need to format memory card. (backup apps/data through titanium backup)
Else, you have to format the memory card as per the requirement of that rom.
friends please suggest some tips how can i lower my android system drainage & please comment on above conf. & stats
any suggestion will be higly appreciated
looking forward for a reply
thanks again
You are using default rom, and to remove the preinstalled apps, you have to root your phone. For the details regarding rooting/recovery etc :
[READ FIRST] [REF] Repository of howto's, roms, kernel, etc. - xda-developers
Regarding battery usage, it all depends how you use it. If you are using it with 3g, it gonna drain faster etc.
You might installed some third party apps which is consuming so much battery. The default roms are capable of giving 1.5 days of battery backup with normal usage.
How old is your phone ? If your phone is new, give some charge cycles to get the battery adjusted with the phone system.
BTW : Don't worry about the system usage etc.