Re-wrap a 18650 battery easily with a heat-shrink sleeve. Just use a hair dryer or heat gun to shrink the new wrapping over a 18650 batteries. These sleeves protects batteries.
Read this before buying: Handle batteries with care. Li-ion batteries are dangerous and can explode when used improperly. By purchasing this item you agree that we are not liable for any damages as a result from this product. Use at your own risk.