This Y cable lets you divide your power supply from a 12V battery so you can charge your Bear Sentry while recharging another device, like a phone (in which case you’d need a step-down voltage converter to 5V).
Do this from inside your tent at night with a DC cable extension that connects to the energizer outside.
DC 5.5mm x 2.1mm female to dual male barrel plugs
38cm / 15” 20g / .04lb