Replace battery part number:

A32-T13
A31-F9
A32-F9
90-NER1B1000Y
90-NER1B2000Y
 

This battery is also compatible with the following models :

ASUS F6 Series
ASUS F6
ASUS F6E
ASUS F6A
ASUS F6K
ASUS F6K54S-SL
ASUS F6K233E-SL

ASUS F9 Series
ASUS F9
ASUS F9DC
ASUS F9E
ASUS F9F
ASUS F9J
ASUS F9S

ASUS X20 Series
ASUS X20S, X20E