1.1 Description 21.6V replacement battery fit for all dyson V8 series 3500mAh Cordless Vacuum Cleaner lithium batteries 1.2 Cell Model 21700 lithium ion battery cell 6S1P 1.3 Typical Capacity 3500mAh 1.4 Typical Voltage 21.6V 1.5 End of Charge Voltage 25.2V 1.6 Charge Current 0.5C 1.7 Charging time 2-3 Hours 1.8 End discharge Voltage 15.0V 1.9 Wide compatibility Dyson V8 absolute, V8 fluffy, V8 motorhead 2.0 Charging cycle more than 300 times 2.1 Over-discharge Voltage Protection cell 2.5V 2.2 Over-Current Discharge Protection YES 2.3 Short circuit protection YES 2.4 Dimension 147*80.2*121mm 2.5 Weight 0.69kg 2.6 Operation Temperature Range Charge 0~45 C, Discharge -20~60 C