Default [Q]Huge battery drain and request for service menu apk

Hello!
I've installed on my oldie Mimmi MiniCM7 pro for stock kernel, and after month of using I've seen, thats my phone have a monstrous battery drain - about a 58% per almost two hours. So, i've change battery - it helps, but very little, draining is almost the same. Wipe battery stats via CWMR not helps. Any suggestions?
And one more - if anyone have service menu APK from stock ROM? Need one, that worked on GB. Thanks for you time!