Currently Being ModeratedFeb 17, 2011 6:37 AM (in response to firstname.lastname@example.org)Your battery's serial number was never the same as your MBP's serial number, and there is no way for you to tell whether another battery was substituted for yours in the shop unless you have a record of the original battery's number. Your MBP's original purchase receipt and packaging would not have included the serial numbers of components and subassemblies like the battery — only the whole computer's serial number.
Batteries sometimes swell abruptly as they approach the ends of their useful lives, and it's entirely possible that your battery did so while it was in the shop for a month. Now you will need a new battery as well as a new logic board if you want to continue using the computer. But because you aren't willing to pay the cost of a logic board replacement, the battery doesn't matter.
If an iPad would meet your needs, buy it.15" '08 UMBP 2.4GHz/4G/500G XT; TiBook 1GHz/1G/120G; iPhone 3G, iTouch 32G, Mac OS X (10.6.6), scanners, projector, tablet, laser and photo printers, Pentax K-7, Olympus E-10
Currently Being ModeratedFeb 17, 2011 7:34 PM (in response to eww)eww is exactly correct. This is an issue that does happen with Apple batteries. It doesn't mean that it is defective but they do expand. If the battery is built-in you can call 1-800-APL-CARE and they will arrange for a mail-in repair to remove the built-in battery. Other than that your battery is depleted and reached the end of it's life.MBP 13", Mac OS X (10.6.6), g.skill 285mb/s SSD and 8GB CL7 ram