the wallstreet turns 10 in may, so even i am shocked that the batteries still work properly. i'm finding that one of them is discharging gradually faster (the other only lasts 10 minutes at this point). oddly though, it's also charging back up faster. both batteries can charge completely within half an hour. i wondered if this is from the batteries themselves aging, and the one that still gets a good hour of work is just on its way out, or if the pmu is acting strange. i do have issues waking from sleep since i got my replacement processor, but it really isn't a problem.
have you tried a reset? theres one here http://www.versiontracker.com/dyn/moreinfo/macos/300
also heres a topic with more info http://discussions.apple.com/thread.jspa?messageID=3786756
i do have a reset program on the computer. my only concern with it is that i know li-ion batteries will only do so many charge cycles, and i don't want to shorten the lives of my batteries. i'll try it on the one that i think is on its way out and see what it does.