[simon6saber]

I think that i am really bad luck on supporting for wp8 and Nokia, besied the mobile internet connection issue on my Lumia 820, another problem has ocurred.
It is a definitely a software problem, the battery information is is incorrect, when it showed 5% left and it gave me a battery critical low warning, I HAVE  BEEN USING MY PHONE FOR AT LEAST 3 HOURES SINCE THE 5%!! And it seems to be able to work for another 3 hourse for sure.

What ever i do, restart my phone, or press the "volume down button + power button" for 10 sec to restart. either way did not work. It is really annyoing.

Has anyone got the same problem as me?

I am really bad-lucked

[cjlim]

Battery meters on phones are only approximate and to be used as a guide only. This is normal behaviour and not weird. You can improve the accuracy of the meter by calibrating it every now then. To calibrate all you need to do is to run the battery down followed by a full charge. 

[simon6saber]

KK, i did the calibrating and the battery can last much longer, but few charges after that, the problem occured,

I mean, after calibrating, the battery info was correct,and the battery could be used for 1.5 days at least,  but, after few charges, the battery info went nuts, sometimes it is correct when it says critical low, the phone will be turned off aotomaticallly after a while, and sometimes i could use the  5% for few houres......such a crasy phone...

[cjlim]

Well if you are unhappy with the phone, you can always get it checked out at your local care point. I can't say I have noticed that sort of behaviour on mine.