Powerextra 21.6 Volt Dyson V8 Replacment Battery: Powerextra specialized in manufacturing various power tool batteries. Being one of the top selling brands in the field of power tool replacement batteries in Amazon, Powerextra batteries always enjoy good reputation by highly strict testing and official verification,high quality materials, practical designs, together with excellent customer service and OEM product standards. Product Details: Battery Capacity: 3500mAh Battery Voltage:21.6V Battery Type:Premium Sanyo Lithium Cells Color:Grey Condition: Brand New High Quality Compatible With: Compatible with For Dyson V8 Fluffy,V8 Absolute Warranty: Powerextra is committed to providing each customer with satisfactory products and customer service. All the Powerextra products are covered by 30 days money back guarantee and 12 month limited warranty from Powerextra Package Include: 1.Always remove battery pack form your tool when you are assembling parts,making adjustments,cleaning,or when not being used for an extended time. 2.If you don't plan on using the Power Tool Battery for a month or more, store it in a clean, dry, cool place away from heat and metal objects. Ni-Cd, Ni-MH and Li-ion batteries will self-discharge during storage; remember to recharge the batteries before use. 3.Do not leave the battery dormant for long periods of time. We recommend using the battery at least once every two to three weeks.