uxcell 85mm Flat Width 1M Length PVC Heat Shrink Tube Black for 18650 Battery Pack

[Music] when using heat ring tubing it's best to use the smaller size possible that fit around battery and if you don't have a tape measurer that you can use it's sometimes difficult to know which size to use I want to use this one but I don't know if it fits if it's a rectangular battery I usually lay them on top and shake the size if these from well rectangular batteries be a little bit too small but this one has drilled edges so this one might work the one method I have come across if you don't want to measure if you too lazy to measure if you don't have a tape measure or if you just want to shake that is actually possible because it's the inner a inner circumference that actually matters not the outer circumference and if it's worries a lot and you can just cut off what one small hole four centimeter piece now this one is very easy to put around and you can actually measure how hard