Page 66 (Model K)
14.1.1 For model K ventilators running version 4.3.1 software.
With mains power connected or disconnected
a) Charged to 75% or greater, the battery icon displays three green blocks.
With mains power disconnected
b) Discharged to between 50% and 75% of battery capacity.
c) Discharged to between 25% and 50% of battery capacity.
d) Discharged to between 0% and 25% of battery capacity
With mains power connected
e) Charging, where the blocks cycle from left to right.