Apple has addressed the Macbook and Macbook Pro notebook performance issues, but Apple says you don’t need to worry about exploding batteries. If you purchased either notebook or an extra battery between February 2007 and April 2007 then download the latest patch. How do I identify an affected battery?
Affected batteries will have one or more of the following symptoms:
* Battery is not recognized causing an “X” to appear in the battery icon in the Finder menu bar.
* Battery will not charge when computer is plugged into AC power.
* Battery exhibits low charge capacity/runtime when using a fully charged battery with a battery cycle count (as shown in System Profiler) of less than 300.
* Battery pack is visibly deformed.
Note: If your MacBook or MacBook Pro battery does not have any of the symptoms noted above, your battery does not need to be replaced. Apple will also be covering those notebooks that are out of warranty.