Calculate your Fire Panel Battery standby times to BS-5839 British Standards in a unique app where you can theme and brand the app with your own company logo, simply tap on the LCD or press and hold the LCD to customise the app to your personal view. The bottom left corner button allows you to setup the fonts to match your device while the battery icon button allows you to see some battery details so you always have an idea what batteries will fit into the fire panel in front of you.