This battery is compatible with Apple MacBook Pro 13'' models A1278 (Mid 2009 2010 2011 2012) and has a capacity of 63.5Wh. It is a Li-Ion battery of black color and has 6 cells. The voltage of the battery is 10.95V and it is compatible with the compatible brand of For Apple. This battery is generic and has a manufacturer warranty of 3 years. It is an AC & DC type battery and has a California Prop 65 warning that chemicals inside the battery may cause cancer.