Battery for Creative Zen, ZN-Z4G-BK, ZN-Z8G-BK 4Gb, 8Gb, 16Gb, 32Gb Capacity: 600mAh Type: Li-Polymer Volts: 3.7V Size : 66.48 x 33.10 x 3.50mm Certificated with ISO9001, RoHS & CE;