My battery on iPad Air 2 and iPhone X drains so noticeably now, I don't know if it's the beta or what. My iPhone's battery health was 100% for 1.5 years, went to 99% in April and 98% a couple of days ago, and that's when it started to feel like it's tanking. The first 5% (>94%) feel like it drains at a normal rate, but then it accelerates. It used to be able to idle an entire day and only use 10-15% but now it uses up more than 50% idling...
The iPad used to be a tank, it would idle for days and days, but now it's empty before the second day is done.