My experience has been hit or miss, but some of the old Apple li-ions have charged up just fine. I bought two NOS ones a few years back that are still pushing about 4200 mAh (about an hour and a half of normal runtime). Since this seller appears to be offering to take returns - that seems to take some of the risk out of it. The guy I bought from down in FL was offering no guarantees, so I got lucky there. Some other older ones that are "condition unknown" I pass on. And I also bought one $20 brick and don't need to do that again.