Buy them. Buy the biggest box of them you can get. You won’t be disappointed. I use these modifying Power Wheels, electric scooters, etc. Easy to use. Makes a strong, water tight connection. Highly recommend.
Pros
The Sopoby Heat Shrink Solder Connectors provide a waterproof seal that protects against environmental factors such as moisture, humidity, and saltwater
Cons
Some users reported that the connectors failed after a short period.