Well I just got my Note 4 yesterday and have already put it on the charger 3 X LOL
I got on it this morning after being on the charger all night, started at 8am, just played with the phone, did the usual things you have to do with a brand new phone downloading apps setting it up and just web surfing and about 3 minutes of watching a video just to see what the screen looks like.
Went from 100% down to 65% in 2 1/2 hours, for me that's woefully inadequate. That gives it maybe a 5 hour straight usage time.
While it is nice to be able to charge it back to full from that 65% in about 30 minutes there are times that you just do not want to hassle charging your phone.
I assume with the 10,000Ah battery I would have been around 85% in that same 2 1/2 hours of usage which is more in line with what it should be from the factory for a so called $800 phone ($300 with contract). and that doesn't even count what the battery will be like in about a year as it loses power.
My only concern would be will the phone fit into the VR Gear and if not then how long will the standard battery last with no doubt what should be a battery hog accessory?
On a normal day where you basically just talk on it a few minutes, check email and the weather a couple times and maybe google a couple things spending a total of about 30 minutes max then of course the standard battery should be more than adequate all day long.
But a Phablet is going to be used much more than that on average.