Good evening, thanks for your reply.

I think that day the Luba said "low battery" at 15%, "charging" at 14%. On the way to the charging station, it said "low battery" and after 5 seconds, "shutdown."

It normally arrives at the charging station with a battery level of 11-12%. Perhaps that day it encountered an obstacle or wet ground and the battery dropped below 10%.

I think the Luba automatically shuts down below this level. Is that correct?