Capacity: 450mAh Li-ion Battery Fit Model: Sony NW-A1000, NW-A1200s, NW-A1200v, NW-A1200 Fit battery part number: CT019, 1-157-607-11 RoHS approved for toxic free. CE and ISO9001 Certificate for quality assurance. Search Tip: Hold Ctrl+F. Window pops up & type a portion of your model number and click Find Next.