Since updating to iOS 13.2.3 etc I was suffering from severe battery drain for the first time ever (iPhone 7 Plus). I always done the updates via OTA but decided to do it via iTunes this time as it doesn't just do a patch update. I know it's only 3 1/2 hours in but I`m still at 100% with minimal use but it was draining before on standby. All background refresh always turned off etc. Looking good so far.