Weird battery issue! ST15i

[ghemanth90]

I'm running latest .62 firmware on my xperia mini & did calibration fix through sony service center 2 weeks back.
I just encountered a weird battery issue on my ST15i
When my mobile reaches last 20% of its Battery level, It gets switched off with a warning "BATTERY 1% OR LOW SWITCHING OFF"
then if I plug my mobile to the charger it charges from 20%. So this implies I could use only 80% of my mobile battery.
Already battery life of Xperia mini is poor and now this issue makes it even poorer
1) any solution? I dont want to repair my mobile with SEUS as I just installed loads of apps, will loose them all if I do the repair!

2) Is there any way to buy a higher capacity battery than the stock one (1200mAH) ??

[gwhispererz]

Hi, the only thing to try (other that software repair) is to remove battery, leave it for awhile, put it back and charge to full. Then monitor the behaviour ....

[ghemanth90]

Actually this issue happened thrice. I'll try ur suggestion & update the results here.

[gwhispererz]

Sure, keep us updated.

[slimshaddy · Accepted solution]

try this....

charge your phone to 100%

remove the battery as gwhispererz said....

insert it back and turn on the phone and you will get 85% of battery..

charge it again to 100% and voila it will never happen again