So long as your battery is not damaged replacing the wrap requires only a heat gun or hair dryer. It’s a matter of peeling the old battery wrap, replacing the battery terminal insulator and replacing the wrap. Then heat up the new wrap until it shrinks itself on the battery.
If the battery wrap is un-even and not protecting the battery terminals, start again until you get it right. However extreme caution must be exercised when doing this, we only recommend replacing battery wraps if you are experienced enough to do so.