Where is the Sentry Case battery and when will I need to change it?
The Sentry Case battery is located in the electronic enclosure inside the case, and it has a quick release panel for easy access. When the Locking Toggle Switch is set to the ON position, the 9-volt battery will slowly discharge. We recommend you test the battery periodically, and if and when necessary, replace it with a fresh battery. Be sure to observe the polarity of the 9V battery with the + side facing upward.