No indication of battery drainage

Jan 9, 2014
Hi all,

Just got my new MI2s, I got it with 2 batteries, the standard and a 3000mA. In both cases the phone don't seem to get a true indication of the battery and shows "100%" until it suddenly dies because there is no battery. The moment I plug it in to charge it shows 100% again... any suggestions?
I updated to the latest MIUI version: MIUI-4.12.5, didn't solve the problem.