Where did you purchase the battery from, and how is the performance, if you do not mind me asking?
I also use a mid 2009 Core 2 duo, but lately I have struggled to find a source for a battery that will last more that 1.5 hours in typical usage. I assume the issue is that any authentic Apple battery must have been manufactured so long ago that its capacity is severely degraded after having been stored (at non-ideal temperature) for so long, and it seems like even many third party batteries available are old and had inferior capacity to begin with.
Where did you purchase the battery from, and how is the performance, if you do not mind me asking?
I also use a mid 2009 Core 2 duo, but lately I have struggled to find a source for a battery that will last more that 1.5 hours in typical usage. I assume the issue is that any authentic Apple battery must have been manufactured so long ago that its capacity is severely degraded after having been stored (at non-ideal temperature) for so long, and it seems like even many third party batteries available are old and had inferior capacity to begin with.