1. Can Built-in 6 Pcs INR18650 Battery cells .2. DIY The capacity for your Machine battery .3. High quality for professional use4. High compatibility with old device and more durable5. Help to repair and assemble batteries packPreparation before assembly:1. If a new core is used, please note:(1). Please use 18650 power lithium battery and small internal resistance, same model and same parameters, Do not use ordinary lithium battery for energy storage (2). please test the voltage of a single 18650 battery, and charge the single battery so that the voltage of each 18650 battery is the same.The voltage of the 18650 battery cell should be above 4.1V2. If the old battery is repaired, please test the voltage at both ends of each cell. If the voltage is different, please charge each cell to the same voltage value.Very important:Ensure that the voltage of each 18650 cell is the same before welding PCB.Please ensure that the voltage of each 18650 cell is the same.The voltage of the 18650 battery cell should be above 4.1VType: Battery Storage BoxModel Number: for dyson V6color:As shownMaterial:Plastic + MetalPackage Contents:1 x V6 Li-ion Battery Plastic Case KitOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.