Symptom of battery failure:
Continuous flashing lights on start-up, Hugo does not enter ‘normal’ mode, is inoperable.
Pre-symptom(?):
Charging LED permanently on… if Hugo is always plugged in = indicative of battery/batteries not being able to ‘hold’ charge(s). If this is already happening, care to avoid full discharge may prolong use-ability. That said, need to replace batteries is imminent.
Suggested preventive maintenance:
If Hugo is always plugged in: Unplug at least once a month. Listen to music, let LiBs run down to 40-50%. Re-charge to full. Do not make it a habit to run LiBs down to zero.