Hi, I've got a mid 2009 13" 2.26 Ghz MBP. I might need to replace my MBP's batteries but the official Apple stuff is too expensive to spend on an old computer. Are there any decent third party batteries available? Where can I find them? Are they advisable? Secondly I know its not on topic but oh well, how dramatic a difference would an SSD make for my system? I have the 160GB HDD that came with the system.