Hi Andy,   Welcome to the world of Frog, you'll love it!   You will need a CR2032 battery (very common, get on the High Street).   Place the desk on a table with the rear (the connector panel) facing you. Remove only 1 screw per side, it's the lowest screw in the curved rear metal silver side.   The bottom panel will want to drop down, so support it.   It's best to get some help as you will want to support the front panel whilst you access the PCB battery holder. You need to try to fli