Powerextra 21.6V 2000mAh Li-ion Rechargeable Battery Pack Replacement for Dyson DC16 Root 6 Vacuum Cleaner Animal 21.6v Li-ion 1500mah Rechargeable Battery for Dyson Dc16 Root 6 Vacuum Cleaner No memory effect, Can be charged or discharged as needed without loss of capacity Safeguard features against incorrect voltage, short circuit, internal overheating All Housmile products are shipped from ePowerEngine 30 Days Money Back and 1 Year Limited Warranty