DIY LCD Displays No Welding With LED Lighting Charging Holder Battery Storage Box

Item: No Welding DIY Detachable Power Bank Case Can install 21PCS 18650 flat head batteries(Batteries not include) Size:1708462mm Charge Power: 5V-2.1A With LED Lighting Color: black,white,green,blue,redNote: 1, The positive and negative poles need to be seen clearly before installation. 2, Some power bank case supply displays "0" after the battery is installed, and needs to be charged to activate the battery Package Included: Power Bank Case (Batteries not include) Note: 1, Don't use pointed batteries. Batteries with damaged appearance are not use.It is not recommended to use the battery with high internal resistance, long storage time and many times of use. 2, Only 18650 flat-head batteries can be used, and the voltage is in line with 3.2V-4.2V. You need to use brand new batteries. Old batteries and damaged batteries will cause failure to work, incorrect connection of positive and negative poles, and the first time you need to use the battery full.