I decided to make some changes to the parts I'm using.

I switched the old ATTiny85 to the larger ATTiny2313. The footprint is actually smaller, since it's a QFN part, and there's more I/O, which makes it easier to program and solves the problems in the last version. I also ditched a few discretes that I didn't really need. I also changed the battery to a rechargable Li-ion battery, which makes the whole thing a little thinner and that way you don't need to worry about replacing the battery, only recharging it. The accelerometer and EEPROM are the same.