Two questions here. First, in creating my battery rules, one for warning at 35% and one for critical at 5% and activating the rules - I got no alerts. That makes sense since this is a subscription, not a poll. That said, I triggered several of my motion sensors (ST 2015 & ST 2016) and the logging shows the battery levels, but no alerts - and a LOT of them are reporting within the thresholds - some even reporting ZERO - which is a tad annoying.
Second thing, why is battery reporting SO unreliable? I have some sensors if I put in brand new batteries they will report 67% and most of them will continue working LONG after getting to 1% or 0%. I hate replacing batteries all the time when I am sure they are not "dead" yet.
This is very true with ST motion sensors - my "generic" door contact sensors are horrible at reporting - they stay at 100% until they stop working.