I have a white macbook 13.3 in. 2.1 GHz Intel Core 2 Duo The battery recently died and I couldn't run it without it. I had just bought a replacement battery and it was working fine. My harddrive went bad yesterday so now I am running off an external hardrive. However, now OSX doesn't recognize my battery... it has an X. However, it still works without the charger... some glitch. Anyone know how to fix it?