Based on the description on their site, the controller includes a built-in battery: "8.39 Wh Li-ion battery, 35+ hours of gameplay... "
That was disappointing for me. Specially condidering the Steam Frame's controllers make use of AA batteries: "One replaceable AA battery per controller, 40hr battery life"
AA Batteries might not be as convenient to use, but being able to replace them is a great advantage. All my Xbox360 controllers still work fine, but none of my PS3' Dualshock 3s.
The official docking station could be used to recharge (rechargables) AA batteries so the functionality could remain the same.
I'm not doing that on a regular basis. I can swap the battery in my Xbox controller without any screws.
E: Wow, I really love being downvoted for my opinion. Super cool shit, guys.
I mean, there are two reasons that you want to swap batteries.
So that the device doesn't die. This is what OP is worried about. This probably takes years and years of use, though (unless you leave the thing discharged for a long time).
So that you can use the controller wirelessly (say, in a living room, so people don't trip over a cord) and also charge its batteries. For most people, I'd think that this isn't a huge problem
I mean, my controllers with lithium batteries last way longer than I would stay awake on a full charge, and next time I use them, they're charged. I normally run my controllers wired for better latency and not having to care about charge, but there are people who do have a legit need for wireless. However, I can think of some exotic cases where it would be necessary. Think of, say, a rec room on a ship or something with shifts of people who are constantly using the thing, where there's no time to recharge (though then, I think you could just get a second controller or something, swap out the one charging for the one in use). The XBox controller did the AA battery thing, and I have a Logitech F710 that does this. Makes a controller heavier than lithium batteries do, though, produces a shorter battery life relative to the weight, and places some constraints on the layout of the controller (since you need to have the volume to stick the batteries in.
For #1, yeah, the idea of taking off a screw after 10 years or something being prohibitive is pretty absurd.
But if someone is just wanting to do the "simultaneous charge and use" thing, #2, then the screw is an issue, because you'd need to do that every, say, two days or so.
#2 is not an issue with a controller advertised to have 35h of battery life. Which you should charge when not in use. Unless the commenter I replied to games for 35h+ continuous hours, in which case none of what they said applies to any member of functioning society.