Sony VGP-BPS21A Battery Compatible Part Numbers:

Sony VGP-BPL13 Battery
Sony VGP-BPL21 Battery
Sony VGP-BPS13 Battery
Sony VGP-BPS13/B Battery
Sony VGP-BPS13/Q Battery Sony VGP-BPS13/S Battery
Sony VGP-BPS13A Battery
Sony VGP-BPS13A/B Battery
Sony VGP-BPS13A/Q Battery Sony VGP-BPS13A/R Battery
Sony VGP-BPS13A/S Battery
Sony VGP-BPS13AB Battery
Sony VGP-BPS13AS Battery Sony VGP-BPS13B Battery
Sony VGP-BPS13B/B Battery
Sony VGP-BPS13B/Q Battery
Sony VGP-BPS13B/S Battery Sony VGP-BPS13S Battery
Sony VGP-BPS21 Battery
Sony VGP-BPS21A Battery
Sony VGP-BPS21B Battery
Sony VGP-BPS21A Battery Fit Laptop Machine Models:

Sony Vaio VGN-AW Series
VGN-AW11M/H, VGN-AW11S/B, VGN-AW11XU/Q, VGN-AW11Z/B, VGN-AW170C, VGN-AW19, VGN-AW19/Q, VGN-AW21M/H, VGN-AW21S/B, VGN-AW21VY/Q, VGN-AW21XY/Q, VGN-AW21Z/B, VGN-AW230J/H, VGN-AW235J/B, VGN-AW270Y/Q, VGN-AW27GY/QE1, VGN-AW290JFQ, VGN-AW31M/H, VGN-AW31S/B, VGN-AW31XY/Q, VGN-AW31ZJ/B, VGN-AW35GJH, VGN-AW37GY/HE1, VGN-AW37GYQ, VGN-AW41JF, VGN-AW41JF/H, VGN-AW41MF, VGN-AW41MF/H, VGN-AW41XH, VGN-AW41XH/Q, VGN-AW41ZF, VGN-AW41ZF/B, VGN-AW50DB/H, VGN-AW51JGB, VGN-AW52JGB, VGN-AW53FB, VGN-AW70B/Q, VGN-AW71JB, VGN-AW72JB, VGN-AW73FB, VGN-AW80NS, VGN-AW80S, VGN-AW80US, VGN-AW81DS, VGN-AW81JS, VGN-AW81YS, VGN-AW82DS, VGN-AW82JS, VGN-AW82YS, VGN-AW83FS, VGN-AW83GS, VGN-AW83HS, VGN-AW90NS, VGN-AW90S, VGN-AW90US, VGN-AW91CDS, VGN-AW91CJS, VGN-AW91CYS, VGN-AW91DS, VGN-AW91JS, VGN-AW91YS, VGN-AW92CDS, VGN-AW92CJS, VGN-AW92CYS, VGN-AW92DS, VGN-AW92JS, VGN-AW92YS, VGN-AW93FS, VGN-AW93GS, VGN-AW93HS, VGN-AW93ZFS, VGN-AW93ZGS, VGN-AW93ZHS

Sony Vaio VGN-BZ Series
VGN-BZ11EN, VGN-BZ11MN, VGN-BZ11VN, VGN-BZ11XN, VGN-BZ12EN, VGN-BZ12VN, VGN-BZ12XN, VGN-BZ13VN, VGN-BZ13XN, VGN-BZ153N, VGN-BZ15GN, VGN-BZ16GN, VGN-BZ21VN, VGN-BZ21XN, VGN-BZ31VT, VGN-BZ31XT, VGN-BZ560CTO, VGN-BZ560N22, VGN-BZ560N24, VGN-BZ560N26, VGN-BZ560N30, VGN-BZ560N32, VGN-BZ560N34, VGN-BZAAFS, VGN-BZAAHS, VGN-BZAANS, VGN-BZAAPS