Hi, what version are you using? We have been struggling with a battery drain bug since version 6.8.3, we are working on a fix for 6.10.0.
You can help us by installing the current 6.9.2 version (currently rolled out to 5% of users, if it is not available to you yet, you can install Beta, more on goo.gl/r8UPdZ) and generate a bug report file (step-by-step on goo.gl/ow1dUi) and send it to me (you can get my e-mail address by clicking on my name in this forum). We would really appreciate your help, thanks!