From what I understand, the S5 Max is supposed to return to the dock when battery is low (<20%) and recharge only enough to resume and complete the current job. That said however, I got a low battery yesterday just before completing the cleaning job with only 1-2 minutes of vacuuming/mopping left. The vacuum returned to the dock and recharged to 80% before finally resuming and finishing the cleaning job. This almost negated the purpose as it was several hours before the job was completed, instead of just a few minutes had it only charged the few percent it required to finish. Can someone clarify how this is supposed to work?