My mid 2009 13" MBP's been telling me occasionally recently to service my battery. This, as far as I know, only started happening after installing Mountain Lion. I'm not completely sure why it's doing this since, while its capacity has dropped from what it used to be, I can still get a fairly comfortable 4-5 hours from a single charge and it hasn't been discharging randomly or anything like that. I used a the Battery Health application to tell me how much charge my battery is giving me compared to when it was new, and it's reporting around 75% which seems about right and is probably enough for me as I take my charger with me most of the time. Is it likely that this is the only reason why I'm receiving the "Service Battery" notification or could there be another problem? Thanks.