I want to get a spare battery for my MacBook Pro 15" notebook and am not sure what I should look for. There are a lot of batteries out there but I want a reliable one and one with more capacity than the original battery. Any suggestions?
This company makes 3rd party batteries that should fit you MacBook Pro, they reportedly have higher capacity than the Apple ones. This battery is compatible with all MBPros except the aluminum unibody models. http://store.fastmac.com/product_info.php?cPath=10_4&products_id=3
In terms of reliability, batteries will only last if they are treated correctly, see this page from Apple on battery care- http://www.apple.com/batteries/notebooks.html