All macbooks that use the magsafe connector slow down when the battery is removed. As soon as the battery is removed, the processor clocks down to 1ghz. This is due to the magsafe connector not being able to provide enough "power", and the battery is suppose to complement it with spare power. So basically, you must buy a battery every 1-2 years from Apple. MagSafe provides 85watt of power which should be MORE than enough power but Apple has decided to make it clock down. My 125watt HP power adapter is only slightly bigger than the MagSafe adapter, so I don't understand why they can't make a 125watt adapter. So, is there a different power adapter we can use so it doesn't clock down?