To begin installing the backup battery in your Honeywell LYNX Plus L3000 wireless security system, you are going to depress the two tabs on the top of your system. Place the system down gently so you don’t damage it. Take the backup battery; place it in the housing area on the mounting plate area. Make sure to locate the wire through the designated slot and then connect the battery plug into the actual motherboard. Take the mounting bracket place it in the slot that is shown on the video, than go ahead and screw bracket into place. Once this is complete seal the panel back up and now you are all set! For more videos on the Honeywell LYNX Plus L3000 wireless security system follow our GEOARM Security YouTube page.