Use these to re-wrap a cosmetically damaged 18650 battery (in case of torn original wrap).
These wraps shrink at 80 degrees celsius - place battery in wrap, then use a hair-dryer to quickly and carefully apply heat causing shrinkage.
Note: Lithium ion batteries contain very high amounts of energy and must be treated with respect. Do not re-wrap a physically damaged/shorted/vented battery.
It is important that the positive terminal of the battery is covered, more so than the negative- as the "positive" end of a 18650 battery contains both negative and positive surfaces (positive contact, surrounded by negative ridge), any metal object bridging these surfaces will cause a hard short.