Originally Posted by Nick-ao
My friend have this problem. After upgrade from 4.2 to 4.4 the battery consuming is very fast. Before this upgrade it was very good the battery consuming.
People have found a solution?
Guys! I found a solution. This worked for me and hopefully it will work for you too.
Firstly if you arent prepared to do a factory reset try wiping the partition cache. HTC told me to this and here are the instuctions given by them
Wipe Partition Cache (In rare cases unforseen consequences can happen and corrupt the data, so make sure you have a backup if there is some data you absolutely cant lose)
1 Power off phone (be sure to turn off fast reboot in settings first).
2 Boot into recovery by press and holding the volume down key and then at the same time hold power key until boot menu appears. (you will see 3 green men in the buttom of the screen)
3 Press Volume down until you have selected RECOVERY then tap power key.
4 HTC logo appears followed by blank, dim screen. Briefly press simultaneously: power key and volume up then release immediately. You may have to do this step a few times to get the timing right.
5 Black screen appears and SD card error message scrolls. After about 5-10 seconds, recovery menu appears (all in very small font). Press Volume-down to Select "wipe cache partition" at bottom of list and tap power key. Cache gets cleared. Then select "reboot system now" by tapping power key again (this choice highlighted). Done!
Note: if you get a picture of a red triangle with a phone in it dont be scared just hold the lock/power button and the phone will turn off.
Then if wiping the partition cache didnt work then im afraid you will need to do a factory reset
Go to settings and then Backup& Reset. From here select the factory reset option. If it asks you if you want to keep your personal data(pictures videos music...) say you dont want to( this means you will need to back up everything on your phone.
Once you have factory reset it install your apps and use as per usual.
When you have to charge it drain the phone to 5-8% and then charge it fully. Only do this if possible. I have noticed by charging like this i get excellent battery life compared to before trying all the things i have written above.