About this replacement
Designed for Acer, IBM devices. Compatible models include Extensa 500, Extensa 500DX, Extensa 501, Extensa 501DX, Extensa 501T, Extensa 502, Extensa 502D, Extensa 502DX, Extensa 502T, Extensa 503, Extensa 503DX, Extensa 503T. Replacement part numbers include 02K6524, 02K6525, 02K6563, BTP-1731, FRU 02K6526, BTP-1831, 60.45B04.011, 91.45B28.001. Key specifications: 9.6V, 4000mAh, Li-ion.