I start recharging mine when it tells me to, and I have noticed a definite decrease in battery time over the last 12 months or so.
it\'s not that big a deal, because I always have one fully charged and one in use.
more annoying a problem for me is that they both seem to have an issue concerning the centre of the forward/backward axis.
it\'s most noticable when playing call of duty, if I sit in a corner, and just idle, my position on screen slowly moves forward.