Evergrow IT2040 Controllable Full Spectrum LED

[kaboom]

My unit is about 2 years old and the clock on the controller is running slower everyday. It's now about 1-2 hours behind everyday and I have to manually adjust it but I want to get to the bottom of the problem. Does anyone know if there is an internal battery that needs to be replaced? I am thinking the battery is slowly dying that why the clock is falling behind, any insight?