Hopefully this helps people stop letting their batteries get so low and/or die. Ideally the battery should never be "conditioned" and should never be below 40% or so, but when below 20% damage to longevity is occurring.
M Dev Nexus 6 Assassin Edition. Android Central Moderator.
Even with my older/other phones prior to my S6, when I never had wireless charging, I always tried to keep my battery/batteries full ... I'm "that guy" that sees the phone at 70% and freaks out thinking it's about to die on me LOL. So either way, I was always trying to keep it fully charged ... not because I knew about possible battery life issues, but because I was/am always fearful of when I'd be going out away from the ability to charge, and also have to heavily use my phone ... which would possibly get me in a situation where my phone dies and I"m completely screwed.
Now, with the wireless charging, it makes it infinitely easier to keep it close to fully charged. I spend most of my normal days at the office, so sitting it on the pad while i'm at my desk just makes sense, and keeps it nearly full all day with rare exception. At home, I don't use the wireless charger that much except for overnight charging. It's on my night table next to my bed, so I just put it on the pad when getting in bed, and wake up to a fully charged phone. This also allows me to just pick it up in the morning to check email, messages, forums, etc. w/out having to worry about the cord connected to it ... it also allows me the freedom to answer an emergency call should I get one while sleeping, and not have to worry about ripping the phone away from a cord and damaging something on either the charging cord or the phone itself.
Again, it's hard to express exactly how great wireless charging is until you start using it, and figure out how it works best for you. It's also hard for me to imagine now how I got along w/out it, and how anyone else could feel there are any negatives to it.
On that note, I keep my quick-charger brick with me, and the factory cable so that IF it gets lower than I like, and feel I need to juice it back up quickly (anticipation of a potential emergency), I can still do that for 30 minutes, then place it back on the pad to fully top off and get back to "normal operation" with my phone.
Now, if/when one day we have pads that hold a charge, and can be taken remotely with you to set on a table that don't need to be plugged in, THAT would be amazing ... and probably not far off ... it would be the same thing as one of those battery pack cases or packs that you carry to charge your phone (samsung makes some, as do others) ... but combine that with a Qi charger body on top of it, and you'd really have something cool!