About this replacement
Designed for Sony Ericsson, Sony, NTT DoCoMo devices. Compatible models include Xperia X1, Xperia X1a, Xperia X1i, Xperia X1c, Xperia X10, Xperia X10a, Xperia X10i, Xperia X3, Rachael X3, Aspen, Aspen US, Faith. Replacement part numbers include BST-41, SO04. Key specifications: 3.7V, 1500mAh, Li-ion.