Sony tells GameIndustry.biz that they will replace PS3 controllers "when and if" they die. As reported yesterday the PS3 controller does not have a replaceable battery pack. The controllers were designed to be play and toss at $49.99 USD when the lithium battery degraded to the point where it could no longer recharge.
A Sony spokesperson said, "The latest generation of Lithium Polymer batteries hardly suffer any memory effect at all, so it'll be many years before there's any degradation in terms of battery performance." And with Sony expecting the PS3 life-cycle at 10 years we're hoping they'll be efficient in their replacement procedure.