●1PC 2500mAh detachable, rechargeable lithium-ion battery. ●Extra battery provides additional 40min running time on regular mode to your S11. ●Designed specifically for the TINECO S11 series smart vacuum cleaner, for PURE ONE S11 and PURE ONE S11 Tango. ●LED indicator light displays usage and charging level vividly. ●Fully charges in between 3-4 hours.