you need to replace your switches, aside from that g304 is almost indestructible, but I feel your pain, I have been trying to find a G304 replacement for years now, but apart from logi and razer, not a single OEM manufactures mouses with replaceable batteries, I hate wires on my desk and wireless mice where you need to charge their batteries every couple of days might as well be wired for all the good they do.
As an aside, if you are buying a new G304, I think that the Esckey owner provides services for swapping switches on logi mice, so it might be a good idea to buy from him and get him to swap switches before sending it to you, atleast thats what I plan to do when my RMA'ed G304 shits the bed inevitably
