Just got my 1TB HDD in the Mid 2010 MBP 13" Unibody. It fit great, and I've got a TON of space now, really happy with. It looks like I may have a bit of an issue with the battery now. I am noticing some irregularity to the meter, longer charge times, and faster discharge while use... Maybe I am being paranoid with the whole process of upgrading my HDD, but it seems there may be something going on, if anyone can point me in the right direction on how to check the health of the battery, if I need to recalibrate, or what it may sound like. Did a fresh install of Mac OS Snow Leopard, if you are curious.