This 18V to 12V “step-down buck converter” with battery bay and DC plug lets you use your Milwaukee tool battery as a power supply for your electric fence (on our list of recommended / tested power supply options).
Add a coaxial extension cable and you could power your Bear Sentry from inside your tent or camper where battery capacity may be less affected by cold weather. You could charge a device at the same time with a splitter cable and 12V-5V voltage converter.
Compatible with Milwaukee 18V M18 Li-ion batteries.
Input Voltage 14.4V ~ 21V, Output Voltage DC 12V, Output Current 3A, Output Power 36W
340g / .75lb