Asus SBP-03 replacement battery provided by AtBatt.com is designed for use with Asus MyPal A632, A636, A639. The PAS-13 is designed to replace OEM part numbers: SBP-03. Amstron PDA batteries are precision-engineered and rigorously tested for voltage, capacity, compatibility and safety to exceed oriinal equipment manufacturer specifications. • Chemistry: Li-Ion • Rating: 3.7V 1300mAh • Dimensions (LxWxH): 2.05 '' x 1.56 '' x 0.30 '' • Warranty: 1 Year