Swollen/pregnant battery on a MacBook (13" aluminium late-2008) The battery in my late-2008 model aluminium 13" MacBook became extremely swollen in early to mid-2012 after only 283 cycles (as per Cycle count under Hardware &rarr; Power), and the button on the multi-touch trackpad stopped working due to the expansion of the battery.  I have since had to remove the battery to get the button working again, but the battery itself hasn't leaked, just expanded very heavily to nearly 1.5&times; the height (perhaps &asymp;0.2 each on top and bottom).  After removing it, it's basically nearly impossible to put it back in and still close the cover.

I'm convinced that this is a fault in Apple's design, because it seemingly started after there were a couple of times that I had a browser open with too many windows, and it busy-looped during the night, getting quite hot and with the fan kicking in.  However, during such occasions, the MacBook itself sat on a rather clear desk in an air-conditioned room, so I find it unacceptable that plain-use self-overheating on the machine's part could possibly cause any such problems.  (I only ever ran OS X on the machine, and it was very far away from any other heat sources or direct sunlight.)

I'm disappointed that now I not only can't use the MacBook as a portable with any kind of battery life at all, but also that it is now subject to resets during power outages and cannot be transported (e.g. in sleep mode) without having to be shutdown first.

Shouldn't extremely swollen and expanded batteries that completely obstruct trackpad button usage be covered by a warranty?  This never happens with any other single  brand-name manufacturer of computer batteries!  What are my options?  Do I have to buy another battery at full price, only to have it become pregnant and start obstructing my button again right after the warranty is out?  I tried going to an Apple Store in NorCal, and they said they can't do anything about it, since it's out of warranty.  They said that even at 1.5&times; the width, it is still supposedly safe to use!

My perspective here is that the battery has not been consumed, but instead became damaged through no fault of my own.  It was either defective outright (either through design or manufacturing), or it has become damaged through hardware/firmware/software bugs related to charging and/or overheating.  I wouldn't have cared if it simply stopped holding the charge for more than a dozen of minutes or so; that's clearly something that is very well documented everywhere and is to be expected.
I run into this as well with our MacBooks after a few years. You have to replace the battery. If you have an Apple Store or Reseller nearby, ask whether there is a replacement program ongoing (there sometimes is) which would allow you to get a new battery cheaper or for free.

It would be odd to have a 2008 model Mac still covered under a one year warranty. Even AppleCare with a three year coverage would normally be expired in this case. You might need to spend $129 for a battery at this point, but you could try one more time at a store if you read up on some details.


http://www.apple.com/batteries/replacements.html


Towards the bottom it says:


  However, the AppleCare Protection Plan for notebook computers does not
  cover batteries that have failed or are exhibiting diminished capacity
  except when the failure or diminished capacity is the result of a
  manufacturing defect.


Then you'll want to go to the full AppleCare document, http://www.apple.com/legal/applecare/appgeos.html, where if you search for battery and skip past the iPod parts, will be:


  
  What is not Covered?
  4.1 Hardware Service. The Plan does not apply to:
  (vi) Consumable parts, such as batteries, except in respect of battery coverage under APP for iPod or unless failure has occurred due to a defect in materials and workmanship;
  


So, with a battery that is rated at 300 cycles, and is listed as a consumable part (i.e. expected to fail over time), it's pretty common for some people with failed batteries to have to pay for a replacement. Now, the one thing would be if the trackpad still doesn't work after you paid for a battery exchange, I would ask them to consider repairing that.

Keep in mind - the warranty (or care plan) has a start and end date. During the time of the plan, it's Apple's responsibility to pay for repairs and service and parts for covered repairs. After that time, it's the consumer's responsibility to pay.

I would head to the genius bar, with an appointment, and ask them to look it over. Explain (briefly) that you were told at another store you had to pay for a battery and feel bad. You clearly wish it had lasted longer and ask if there is any way they could help you avoid paying for either a repair of the trackpad or a replacement of the battery. 

Think of that person as your friend as opposed to someone "working for the man" and is there to say no. You might still get a no answer, but at least you read up and can talk with them over what would be covered and what wouldn't be covered. By trying to get a second hearing of your situation, you might either feel better or they might find a way to help and you'll be out a trip to the store and maybe the cost of a battery.