Existing users, 
Since installing this update earlier today, my MacBook Pro will now lose power without warning when running off the battery. The battery was perfectly good (only 130 cycles) and could run for 2-3 hours before this update. Now it runs for 5-20 minutes and then my MacBook Pro dies completely.
Because I use FileVault and it is not a safe shutdown, I have lost data each time this has happened. I have tried completely discharging and recharging the battery as Apple suggests for recalibration, but it continues to happen.
Apple Battery Update
For MacBook (13-inch) models.
Version: 1.4
Shutdowns Without Warning
Feedback Type: Commentary
Contributed by: GerritG Friday, April 27 2007 @ 05:59 PM PDT
Product Platform: MacOSX
Used Product For: Less than a month
Recommend Product: NO
Comments
Check these instructions of you're having problems. - Esquared
http://www.apple.com/support/macbook_macbookpro/batteryupdate/Saturday, April 28 2007 @ 12:07 AM PDT
Shutdowns Without Warning - psynomad
I had the same problem with machine shutting down randomly on batt power,turns out it was a faulty battery, a week or 2 after this started happening, my battery started overheating and eventually swelled up...took it to apple, and they exchanged it for a new battery.
Could be a bad battery batch
Zak
Saturday, April 28 2007 @ 04:36 AM PDT
Shutdowns Without Warning - jashue1
What do you need to use File Vault for? Do you work for the CIA or are you just paranoid? It seems your problem was made a whole lot worse for it.Sunday, April 29 2007 @ 08:11 PM PDT
Shutdowns Without Warning - Angostura-3
Surprising as it may seem to you, some people - even outside of the CIA - may have company confidential data on their laptop, or even confidential customer data on it.Thursday, October 04 2007 @ 09:51 AM PDT
Shutdowns Without Warning - tsmyth2
Same here. Shuts down with about 30% battery remaining.I also have done the battery recalibration, to no avail.
Sunday, May 06 2007 @ 10:42 AM PDT
Shutdowns Without Warning - photomacuser
Call Apple! You may have had a bad battery and this update just made it worse. My battery lasts for 3-4 hours. In the meantime, until you get your new battery- don't do important work without the power cord!Reply to This
Friday, April 27 2007 @ 07:31 PM PDT