Battery Drain

Hy,i bought the P8 Lite for about,3 weeks ago,on the third day i made the update to the last version of Android 6.0. Everything was fine until about one week ago when i put a second sim card,after a day the battery started to drain very fast,like 15% to 20%/h on screen with mobile data activated and like 25% to 30%/h when gaming with mobile data. It's very strange because,before i put the second sim card the battery drain was like maximum 10%/h on screen with mobile data and maximum 16%/h when gaming with mobile data. And the difference between the hardware and software was like 40% software and 60% hardware. Now it's going crazy, software 8% to 12% and hardware 88%to 92%. The screen use like 55%... It;s such a big difference and i want to know why is this happening. I want to say that i took the sim card out 3 days ago and today i made a factory reset but no result. :(:(