The last period my Andromeda Alesis acted strangely when I switched it on. It was either out of tune, or all the presets sounded very distorted. Every time it started up it also asked to set the mod wheel in the lowest position and press a button. I started to suspect that the battery could be empty. I read on the Internet that the average life span of the battery of the Andromeda is about 4 years and I already have it longer than that. So I decided it was time to open it up.