I did a full factory reset 8 weeks ago and put nothing extra on the phone recently at all. It reads though there's another update due very soon (5/11/2018.)
Hope this helps, but turning off Mobile Data solved the issue. On WiFi and the battery has sat at 25% for 2 hours now. TWO! With mobile Data on, that 25% changes to 24% in 3-5 minutes.
Hi Guys.
Mine has been doing the same, but it's down to the Mobile Data connection. When on Wi-Fi, manually turn off Mobile Data and BOOOOOM - low battery usage.