Welcome to the forums!
That's a great point, and one that didn't even pass through my mind. Perhaps it's a triple-edge sword, though. The PS3 gamepad might last three years (I really have no idea the duration of a LiOn battery), but you might spend more on batteries for the Logitech gamepad in that time. Unless of course you use rechargeable, but I've never had great experiences with using rechargeable batteries in devices like this.
I do wonder how long the official gamepad would last... it's a good point. At least when it -does- die, you can use it as a wired gamepad, so not all hope is lost I guess.
Intel Core i7-3960X, GIGABYTE G1.Assassin 2, Kingston 16GB DDR3-2133, NVIDIA GeForce GTX 770 2GB
Kingston HyperX 3K 240GB SSD (OS, Apps), WD VR 1TB (Games), Corsair 1000HX, Corsair H70 Cooler
Corsair 800D, Dell 2408WFP 24", ASUS Xonar Essence STX, Gentoo (KDE 4.11. 3.12 Kernel)
"Take care to get what you like, or you will be forced to like what you get!" - H.P. Baxxter
<Toad772> I don't always drink alcohol, but when I do, I take it too far.