The battery life seems to vary with the aircraft type: I suspect that the ENC must work harder in some types than others, thus draining the battery more quickly.
In the 206, it seems to cope quite well, and battery life is around 20 hours, but in the BK117 I only got about 10 hours or less. It seems to have trouble coping with the 4 blade beat, and takes some time to settle down after take off, with reversions during flight allowing the 4 per to come through.
We now have Bose X hard wired in the BK (10 of them
), and the pilot's headset allows a lot of wind noise from the door and window seals, but at least I no longer have to swap batteries on a regular basis
