Specification: Model:XCMRD.Battery Type:Lithium ion.Capacity: 58Wh/5200mAh.Voltage:11.1V.Cells: 4-Cell. Compatible Models:Dell 14 3421 3437 3443 14R 3421 5421 5437 N5421 N3421 15 3542 3543 3541 3521 3537 3531 i3542-5000bk i3542-3335bk i3542-6000bk 15R 5521 5537 N3521 N5521 N5537 17 3721 3737 5749 17R 5737 5721 N3721 N3737 N5721 N5737 Latitude 3440 3540 E3440 E3540 series Vostro 2421 2521 3441 3445 3446 3449 3546 3549 series P37G P28F P17E P40F. Replace Part Number:XCMRD P28F MR90Y 4WY7C FW1MN T1G4M XRDW2 0XCMRD 0MF69 24DRM 49VTP 4DMNG 6HY59 68DTP 6KP1N 6XH00 6K73M 8RT13 8TT5W 9K1VP DJ9W6 G35K4 G019Y N121Y MR90Y MK1R0 VR7HM PVJ7J V1YJ7 V8VNT YGMTN X29KD W6XNM 312-1390 312-1387 312-1433 312-1392 451-12107 451-12108 M431R M531R M731R P26E P17E P40F 312-13929 K1VP. Security:100% New from Manufacturer,have passed strict intelligent detection, New Brand product, works as original parts, Also CE,RoHS certificated for our batteries.Rechargeable Up to 600 times over life of battery.