Rechargeable Bark control collars are more convenient. You don't have to worry about getting replacement batteries every few months. We stock good quality rechargeable anti bark collars which are built in lithium fast charge batteries. They average take 2 to 3 hours to charge in full and last up to 1 week per full charge. The battery life is depending on: 1. How often the dog barks. 2. The output level you set. 3. If the collar been turn off when not being used.