Octatrack batery low

hey there guys , a while a go my octatrack started to show wile starting mode’ the msg “low battery” meanwhile a page that i should insert date( day/ year) appears. anyone knows whats going on? what shoud i do? should i replace the battery where is it ? do i have to open it to get it changed ???
need help,
reguards

A post was merged into an existing topic: Battery fail on Octatrack