Weird Battery Activity: It regenerates!!

Never experienced this panorama experience before...
I am using SONY XPERIA sola and I updated the device (myself using the Update center in the phone) to the latest GingerBread firmware...
...and soon I realised that it drained the battery like HELL!! (but I already get used to it anyway since it still new to me...)
What really weird is that somehow, though the battery drain super-fast (when running CPU-hungry apps) and the battery dropped like a rollercoaster...
...I found out that somehow the battery REGENERATES itself...
-See at the middle- (I DID NOT EDIT!)
There's a bit lift off in the middle line and as you can see I DIDN'T CHARGE IT at that time...
It isn't just my phone, some of my friends (which they were WALKMAN series users) also had this weird condition happen...
So... What did you put into making a battery, SONY? XD (or my phone and/or battery had problems??)
Solved!
Go to Solution.

Anyone... Help!!
Can anyone teach me how to fix the firmware of my phone using the PC Companion (without having upgrade to ICS because I have a feeling that it won't fix my problem but making it worse!)?
My battery is worsened by the minute...
...and don't tell me to use the method:
1. Turn off the phone, open  the phone's back cover, remove it, wait 5 mins, and so on...
...because the problem here is that my phone is locked with screws...
Anyone can help, many thanks and appreciated..

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