I have had a couple of users complain of increased battery usage after installing MDM on their phone. They report that their phone goes from 100% charge when they go to bed to dead and needing a charge to turn on in the morning. They all have iOS 9.0 or higher so I had them look at the battery usage and the phones report that the most battery usage is on the home & lock screen or searching for a signal
I was initially willing to chalk it up to an iOS update issue or some sort of power management setting but I had a few of the users track when it occurred. I checked the Command History and each time they reported it occurring there was a Gather Device Information action logged.