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Place battery inside of PVC tube equi-distant at both ends. Use a hairdryer/ on hot setting or small blowtorch and start by shrinking top or bottom end first. Keep moving the hairdryer/torch up and down battery length, then down to the open end. If your wrapping isn't transparent then label your battery wrap with a marker pen afterwards. This process doesn't take more than a minute or two.
Always bear in mind battery safety and don't damage or overheat the battery.
Please make sure this size will fit ONLY to 21700 Battery