Not mine, but thought this was worth a few grins
Says 6-16 hour battery-life, so with those tubes it's gotta be a pretty big battery, maybe 3500mA-hr. 2 months in standby seems pretty short, so it's
probably running a small CPU in sleep-mode.
Mine (still working on the case) draws 2uA in standby, and therefore limited by however long it takes the Li-ion battery to self-discharge.
But when the display is on, I'd be lucky if I got 2 hours with it's 1050mA-hr cell.