I just fired up my "hotrod" 1.5ghz 12"(it has an SSD). Much to my surprise, I apparently hadn't used it since February. It has a good, less than one year old NewerTech battery with about 40 cycles in it(Newertech is the gold standard in aftermarket batteries, although they no longer make them for the 12" PB). Unsurprisingly, the battery was dead and it had gone into "deep sleep."
I plugged it in, started it back up, and ran Geekbench. My initial numbers were horrible(in the 200 range) but the battery was also still more or less dead. They improved as the batter charged, and I also did a reboot to clear out some applications that were left running and known to have serious memory leaks(i.e. Canon EOS Utilites). The last run I did was 694, although the battery was only up to 3% and I think it can do better. I'm going to let it charge for a few hours and try again.