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Helpful answers
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Dec 1, 2015 6:17 AM in response to rodstarkusaby Lanny,★HelpfulThat would be the batteries swelling up. You should get them looked at right away before the swelling causes unrepairable physical damage.
Defective batteries need to be removed as soon as possible. The swelling is a very common failure mode. If the MacBooks weren't so old, the batteries may have been replaced by Apple under an extended warranty.
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Dec 1, 2015 6:16 AM in response to rodstarkusaby K Shaffer,★HelpfulSince the expanding batteries usually leak, those should be removed and any liquid
evident should be wiped up. Not sure what the best recommendation is to clean the
area where the battery liquid had been, since other products (like water) aren't good.
Depending on the build model year of the MacBooks involved the battery may be
easily removable with minimal tools. Later model MacBooks involved taking off
the back panel to remove 'built-in' batteries. These were originally not intended
to be user-replaced, when they're not a component.
Portable Apple Accessories & upgrades:
http://eshop.macsales.com/shop/powerbook-ibook-macbook/
The different MacBook 13-inch models (circa 2006 to 2010) with easily removable
batteries and other characteristics can be determined by part number & database.
• MacBook repair guides - ifixit.com:
https://www.ifixit.com/Device/MacBook
Also the iFixit guides for MacBook can be used to see which best matches those
units you have. Replacement batteries may be available from macsales.com online
or sometimes the iFixit site has a listing for batteries still available.
• Lookup your Apple serial number to identify Mac product:
https://www.powerbookmedic.com/identify-mac-serial.php
• About Mac notebook batteries - Apple Support
Hopefully you can replace all the batteries before they leak or swell, some may have
already been well past their prime if not replaced in the past few years.
Good luck!