I have been searching, and have come close a few times, but I am starting to think the critter I am looking for just doesn't exist.
Is there something out there that does speed/cadence/altitude change (via barometer) along with any other optional niceties like temperature/odometer and such, in a preferably wired system so it works reliably, but doesn't go ahead and add other significantly battery draining features like HRM and GPS?
There is a model from VDO that comes so close to being perfect (VDO MC1.0 Wired), but it lacks cadence. I really would like to get something like this to start collecting information from my rides, but I really don't want to be mucking with batteries every few days and the most popular one these days it seems is Garmin Edge series, which is impressive, but I rarely buy anything knowing I am going to be going through two battery replacements every week.
Does such a beast exist or is something like this just not in demand so nobody makes one?