hi guys, for those of you still want to remain un-root and having battery issue, try this:

1. Using home->running (go launcher feature).
2. You will find 3 apps (Mwarranty, FM, QQdoc) which is sticky there even u "sweep" them for many times.
3. So now you just simply holding in an app, and after that touch on either one of the 3 apps, choose info.
4. Then u will now be in the apps info setting page, in here, you Force Stop (M warranty, QQdoc) and Disable (FM Radio).
5. If you restarted your phone somehow, you may need to repeat the steps ahead.
6. For the disabled FM radio, you need to find back the FM radio and enable it back in order to use it again.
7. That's all, hope it help, it's working for me.

flashtool and usb vcom driver is here:
http://www.sendspace.com/file/izj32g

as for steps...
later i update here.

EDIT:
before you do anything, remember that you do this at your own risk. I recommend you to do a backup of your current rom in case something happen like stuck in boot. to do a backup of your current rom, 1st you need to download MTKdroidtools here.

next you need to go to your phone under settings>developer options>enable usb debugging.
when you connect your phone to your pc the driver for android phone will most likely fail to install.
you need to manually install it. Here is how.

Press your windows button. right click on computer and click manage. on your left hand side choose device manager.
you will see the android phone with exclamation mark there. right click on it and choose update driver software.
then choose browse my computer for driver software. After that choose the option > let me pick from a list of device on my computer. Click show all devices. then Have disk. Browse to your mtkdroidtools there is a usb_driver folder inside. Choose the android_winusb.inf then click Android ADB Interface and choose next. There will be an update driver warning window. Just ignore it and click yes. Phew..

Ok next launch the mtkdroidtool via the MTKdroidTools.exe with your phone connected and click root.
[attachmentid=3269615]
look at your phone and click the restore button at the bottom right corner of your screen. Wait for it to do its thing and reconnect your phone. Then when it say it is necessary to keep rom click no.
[attachmentid=3269617]
When it asks to install supersu, busybox if you want your phone to remain unrooted then click no.

After that click on the root, backup, recovery tab. click on backup userdata and cache. then click backup. wait for it to finish. this takes about 10 mins to complete.
[attachmentid=3269619]

when it is finished it will ask weather you want to pack the backup or not. choose whatever you want.
[attachmentid=3269626]
then click to prepare blocks for flash tool. navigate to your mtkdroidtools folder>backup>your backup just now and choose the files.md5. the tool will do some voodoo magic and place all the files that you need to flash your phone back into the folder !Files_to_FlashTool.
[attachmentid=3269627]
Click reboot and choose reboot.
Congratulations, you have successfully made a copy of your rom.

This is really long and we're only halfway done. How?

i use the steps below to root my BP2
can refer mine if u wan

1. follow instruction here to install the ADB driver for your phone first
2. download the Root_with_Restore_by_Bin4ry_v18 here
3.extract it and run RunMe.bat
4. follow instruction shown in the command prompt
6. after phone restart, u will notice 1 new app install call "SuperSU"
7.enjoy ur rooted BP2 ! 

note: u need to enable "USB debugging mode" and "unknown resource" on ur phone first before doin all the steps.
and do it at ur own risk  

So, in order for you to use your external SD card to save apps, this should be the trick



Play close attention to these 2 lines. The one below is my EDITED one.



The original one should look like this



At the dev_mount sdcard /mnt/sdcard, swap the sdcard2 from below to top. Then reboot your phone. The primary SD card should now be your external SD card.

DO NOT TRY IF YOU HAVE NO IDEA WHAT YOU ARE DOING. I WILL NOT BE HELD RESPONSIBLE IF YOU SCREW UP YOUR PHONE.