6-pack batteries for Humane Contain RC-7 and RC-8 electronic dog fence radio collars, and Bark Terminator BT-3 bark control collar Alkaline battery is not rechargeable Typical battery life in the RC-8 radio collar is 4 to 6-weeks, but results may vary Typical battery life in BT-3 Bark Terminator collar is around two months (after initial training period) but results may vary Installs in seconds