Measure the approximate length of heat shrink needed to throughly cover all nearby damage with a single piece of heat shrink.

The length of the heat shrink should be longer than the actual length of the damaged or exposed wire.

Use 3/8"(10mm) diameter heat shrink. This size diameter is large enough to slide over the charging interface and small enough to secure itself on the wire when heated.

Cut the heat shrink to the appropriate length using scissors.