I don't think I've ever seen 0% on either mine or my wife's iPad. We use them all day, but rack them at night for a full charge in the AM. Battery life isn't a concern in the least for us. It's tremendous! Definitely a new chapter on battery performance in a mobile device. We also have a couple of the new MBPs (13 and 17")...and neither comes close to the approximated times from Apple. The iPads are a different story...we generally do better than the marketed times!
As far as wireless charging....that's gotta be good for our bodies, eh? Radio Waves, HF, UHF, VHF, microwaves, et al....and now wireless electricity!!! Sweet😕 I gotta figure that's a long way off...but, what do I know. Two years ago, I'd have NEVER guessed I'd be holding the future in my hands TODAY (The iPad)....Absolutely the most revolutionary device, for myself and my family since the advent of the 'net! Seriously!
J