NOTE: Please check your battery part number and Laptop Models to ensure you are getting the correct battery for your laptop!
Suggestion 1.For use a new battery, you'd better try a few cycles of discharging to 5%, then charging up to 95%. 2.Do not always run out of a battery to 0%, this would make it damage or usage life shortened. 3.Do not put away a battery for a long time (more than 2 months), this would cause cells inside of a battery losing balance. The battery will not be charged up again or its lasting time shortens, so do charge a battery at least one time within two months.
Compatible Part Numbers : 661-5229 / 661-5557 / 020-6547-A / 020-6765-A / A1322 / A1278 (2009 2010 Early 2011 version)
Compatible Models : MacBook Pro 13-inch 2009 Version: (B990LL/A, A1278, MacBookPro5,5) - only for Mid 2009 version (MB991LL/A, A1278, MacBookPro5,5) - only for Mid 2009 version
MacBook Pro 13-inch 2010 Version: (MC374LL/A, A1278, MacBookPro7,1) - only for Mid 2010 version (MC375LL/A, A1278, MacBookPro7,1) - only for Mid 2010 version
MacBook Pro 13-inch 2011 Version: (MC700LL/A, MacBookPro8,1) - only for Early 2011 version