After the update my wife's DTEK60 had very poor battery life. Facebook and the Tile application were consuming a lot of power. I removed them and the battery life improved. She reinstalled the Tile application today. The battery again discharged very fast. Fitbit and the Tile application were consuming lots of power. They have been removed and the phone is charging. We will see what happens next. Lots of forums for other phones mention battery drain issues and heat when upgrading to Android 7.0. The DTEK60 has not received the update to 7.0. My phone is a OnePlus 3T, working fine, but the forums on the OnePlus site are flooded with battery drain and heat issues.