The old and fairly reliable Sennheiser RS40′s I was using up until a few weeks ago finally gave up the ghost in the run-up to Mobile World Congress this year – or to be more accurate, the battery packs finally gave up. Despite overnight charging, I was getting only about three hours of operating time; and since the charger in the headphones themselves wasn’t working, I only had the charged battery in the base unit, so I was getting maybe four hours a day from them.
The RS40s were (and are) really lovely headphones, with the great feature that if you stood up to walk to the printer and forgot you were wearing them, you didn’t treat the rest of the lab to the cartoon Yoink! Thud! sound effects as you nearly strangled yourself with the headset cord. Shame they were let down by the powerpacks…
You can’t even find the BA151′s easily anymore 
So the hunt was on for a better set of ‘phones for the lab…
