[quote=“” Snuffy""]
Umm… Battery??!
[/quote]
see the manual, for example on the bottom of p.2: “The device contains a non rechargable lithium perchlorate battery cell that may need to be recycled separately depending on local environmental laws. If the battery needs replacing, please contact Elektron or a local professional technician for servicing.” etc.
It’s supposed to last several years before it needs replacement, but with a mk1 you might well have reached that point.