Stay unplugged longer with this new Toshiba 3820 Laptop Battery. It is a rechargeable Li-Ion battery can replace the original system battery or be used as a spare. Battery life (and recharge times) will vary based on many factors including screen brightness, applications, features, power management, battery conditioning and other customer preferences. Hewlett computer solution

Compatibility:  Toshiba 3820 Laptop

• COMPATIBILITY : Replacement for MacBook Pro 13 inch Mid 2009, Mid 2010, Early and Late 2011, Mid 2012 Version A1322 A1278 661-5229 661-5557 020-6765-A 020-6547-A laptop batteries. Batteries for MacBook Pro 13″ A1278 (2009 Version) / MB990*/A / MB990J/A / MB990LL/A / MB990CH/A / MB990TA/A / MB990ZP/A / MB991*/A / MB991CH/A / MB991J/A / MB991LL/A / MB991TA/A / MB991ZP/A.