A selection of PVC Battery Wraps, sold individually, as well as terminal protectors, sold individually, in the case where your battery wrap has been damaged and you want to patch it up with a fresh coat.
Why would I want one of these?
These battery wraps are pre-cut, with about half an inch give for an 18650 battery. To apply the wrap, sleeve it over the battery, trim it down to about 3mm excess on the bottom and top of the battery, and use very light indirect heat such as a hairdryer (on low setting) heat-shrink gun, or careful use of a lighter to indirectly fan warmth over the top and bottom, if done properly it will tighten nicely over the battery.
When applying a terminal protector, simply place it first over the positive terminal and then apply the shrink wrap to hold it in place.