I don't think that is a fully accurate summary of the way the Hugo2 works in desktop mode. As far as I am aware it does not run just off the power supply exclusively. Rob Watts described it more accurately like this, "In this (desktop) mode, the charger supplies current that matches the current needed for Hugo 2, current from the battery is only provided for dynamic current surges, so it's effectively no longer in a charge discharge cycle. Secondly, when in desktop mode, the sustaining voltage is reduced to ensure maximum life." So the battery is still used but only for dynamic surges.