12 Months Warranty Specification: non removable battery mechanism Material : aluminum Battery Type : 1500mAH Rechargeable Lithium polymer battery Motor : flat motor 8 v 85000 rpm Operation voltage : 4.5 - 12v , suggest not exceed 10 v Stroke : 4.2 mm Charging time : 3-4 hours Running time : 4-5 hours Battery safety : microchip battery controller which prevents short circuilts , overcharge , over current or battery drain 1 year warranty