Sidden battery problem - iPhone 4

i bought iphone 4 two-tree months ago, used phone in total around 1 year old. when bought it, had ios 5.01 installed on it.

use phone every single day @ work music, , ipod app runs 9 hours in row, occasially using facebook in between. if had charged phone 100% night, phone have around 50-60% left when left work, perfect.

2 weeks ago battery went crazy! after using ipod app 2 hours, have dropped 30%! phone dies after 6 hours play now.

whats more strange, if on standby nothing turned on, last whole night without charging , dropped 2%.

it's jailbroken if matters... jailbroke complete after jailbreak come out, problem started week ago.

ideas?

ps... headline supposed "sudden"

 

i have similiar problems. started 100% in morning , dropped 80-90% in evening. it's dropping 20-30%. didn't install new , turned off useless gps-stuff etcpp...


relevant cydia-tweaks:
-bitesms
-browser changer
-calendar notification center
-cydelete
-fakeclockup
-folderenhancer
-infinidock
-intelliscreenx
-killbackground
-manualcorrect
-mobilesubstrate
-multiiconmover
-notificationshower notification center
-privacy
-stayopened

rest apps sysinfoplus, grooveshark, pkgbackup, ...

 

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