Get yourself Eneloop rechargeables. You can get a 4-pack with a charger for $17 on Amazon. The difference between your standard throwaway Duracell's or what have you is noticeable.
I know it's a matter of personal taste, but I think going the route of AA's instead of an integrated battery pack is so much better. When you're out of juice, it takes 10 seconds to switch them out so you don't need to be wired all of a sudden and then plug in to charge halfway through a gaming session, and you never need to worry about your integrated battery pack losing its charge over its lifetime and needing to buy a whole new controller just to replace a failing battery pack.
All this talk of dual analog sticks being "archaic" is really strange to me as well... They were a really major addition to controllers in the 90's. Previous to that, there were very few FPS games available on consoles, because they were extremely hard to make and were extremely clunky in general. There was a reason why it was generally laughable to say you were making an FPS for a console with a controller. It wasn't until dual-sticks came along that you could actually make it fairly comparable to the experience you got on PC up to that point. Halo being the biggest example of them doing this right, and for that notion to get swept away.
Plus, it meant that in games where they wanted you to control the camera, without the analog stick, they needed to use two buttons on the controller to control camera rotation left and rotation right. Analog stick eliminated that, and also gave the developer easy access to do vertical rotation as well, without taking up more buttons.
I'm not arguing that there isn't a better, more precise method. I have really high hopes for the track pads on the Steam Controller. But anyone who argues that dual-sticks were BAD for the industry...? Hell no. That is crazy talk.