How long does the MBR Battery last in years? Deciding factor on purchasing? Help?

I'm nearly ready to pull the trigger and get my first MBR 15 inch, but something keeps nagging. The Battery. THE BATTERY. Yes the battery is relatively nice, and one might think insignificant in the grand scheme, but IT'S GLUED INSIDE THE COMPUTER, and basically IRREPLACEABLE unless you pay some ridiculous cost, my guess is around $400. So how long is the battery expected to last? 4 years? No battery lasts 4 years. It's mind-boggling to me why Apple decided to glue the battery. After 2 years of moderate to heavy use of your MBR you're just expected to fork over $400 for a new battery? A NEW BATTERY?!!!!! Realistically how long will the MBR battery last before it gives up the ghost and has to be plugged in 24/7?

It is not "glued" inside the computer. And yes Apple offers a replacement program for $200 and under depending on the model for out of warranty:
http://support.apple.com/kb/index?page=servicefaq&geo=United_States&product=Macn otebooks
For in warranty for a defective battery, it is free:
https://www.apple.com/batteries/replacements.html
AppleCare can be bought at discount during the first year of computer ownership from:
https://www.lacomputercompany.com/cgi-bin/rpcart/featured.cgi?group=appcare
Just remember to register it after receiving the box, and keep all the material inside, including the registration number until you get your enrollment number.
How long? Depends on usage:
http://www.apple.com/batteries/

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How long does the MBR Battery last in years? Deciding factor on purchasing? Help?

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