Battery Type: LiFePo4; Voltage: 3.7V; Capacity: 1Ah to 20Ah (Single ... Application ---Blue-tooth, MP3/MP4/MP5, PDA/Mobile phone, Portable DVD, PMP, GPS, Laptop, Digital Camera, Cordless Telephones, R/C planes ... , for other models can be tailored according to requirements! Cylinderical Lithium ion Battery Cells