Replacement Battery for: SportDOG TEK 2.0 GPS Collar,TEK-2L and TEK-V2LT Dog Collar 100% Compatible with original battery; 180 days warranty Capacity: 1800mAh; Nominal Voltage: 3.7V Battery Type: Li-ion Polymer battery; Safe and reliable battery certified by UL, CE, UN38.3, RoHS Over 300 times cycle life; Long working time