From
rEvo:
" the system rEvo already advises for some time, ‘rotating sensors’: the system works as follows: as soon as the youngest of all sensors in your system (3, 4 or 5) reaches the age of 6 months, you replace the weakest (the one that reacts the slowest on PPO2 changes, or the one that seems to become closest to current limiting, during the test at 6/7meters), or if you can’t find a ‘weakest’, then the oldest in your system. If of course a sensor fails before the youngest gets 6 months old, you replace it, and the latter one becomes the youngest at that moment."
So my real world experience with 5 cells are that since 2013 I've had one cell that mechanically failed i.e. a zero m.v reading no matter where you put it and it was replaced for free.I am not a fanboy of any manufacturer, the rEvo has had its issues but when I've been operating it with 5 cells, it costs about as much the same as any other ECCR.