Problem 4: Defective Battery

Problem: The MacBook's or MacBook Pro's battery goes down to around 5%~80% (varies for each battery, mine goes to around 35%) then shutdown with no warning. When rebooted (if able to) there is no window saying that the computer shutdown unexpectedly.

Cause of Problem: Defective Battery

Time needed: 2 minutes ~ 10 days

Model: Battery/Computer bought between February 2006 and April 2007 for MacBook or MacBook Pro

First noticed on: My MacBook

Solution:
1. Download the battery update. If it doesn't work go to step 2.
2. If your computer has been bought less than 1 year ago, go to step 4. If not go to step 3.

3. If your computer has an Intel Core Duo Processor and has been bought less than 2 years ago go to step 4. If not go to step 5.

4. Call apple and demand for a replacement. Get your computer and battery serial number out before you call them. If they reject at first, tell them that according to this page, you are covered (supposing that you bought your computer/battery between February 2007 and April 2007).

5. Go to a Retail Store to get it fixed. You will get 90 days of warranty for you battery. 

Or, you can buy a new battery for a more expensive price with 1 year of warranty.

Result: Your battery shouldn't have any problems.

Other: According to this page, Intel Core Duo MacBooks and MacBook Pros that are bought between 2007 February and April are covered for 2 years, even though the battery originally has a warranty of 1 year (including those with Apple Care). This can be a key tipping point for you to get that replacement.