We had worked hard on providing customers with better products, constantly overcoming technical problems. The batteries are certified by UL-/CE-/FCC-/RoHS. Please feel free to buy. Any question can contact us. CUSTOMER FIRST is our aim. We will do our best. Service: 12 months warranty & 60 days money return guarantee. Providing professional customer service within 24 hours. If the return window has been closed, please contact us. Specification: VI04 ; Battery type: Li-ion ; Voltage: 14.8V ; Capacity: 38Wh 2600mAh ; 5 A+ Cells. If you have any question during the purchase or the usage, please believe us. Contact us through the ASK A QUESTION WINDOW. We will do our best. Your satisfaction is our power to be better. Compatible P/N: VI04, VIO4, VI04048, VI04048-CL, HSTNN-DB6K, HSTNN-DB6I, HSTNN-LB6J, HSTNN-LB6K, 756478-421, 756478-422, TPN-Q139, TPN-Q140, TPN-Q141, TPN-Q142, TPN-Q143, TPN-Q145.