No, I didn't. Aaargh! That (48 mA) seems like a crazy consumption for an OLED. For example, I've just bought a FitBit One, which has an OLED display. The whole thing is no bigger than a few sugar cubes, but contains a 3-axis accelerometer, an altimeter, a processor, a wireless comms chip and a battery, and it's looking as if it will run for at least a week on a charge.
There will be a fair bit of power available, from a LiPo cell, but it sounds very much as if I don't need to bother with switched powering.
Can anything be done to reduce the AXE134's power drain? Dimming, perhaps?
I followed your link - thanks for that. 48 mA. Hmmm. With my proposed battery system, which is chargeable via USB, it would give about 56 hours of operation. Not brilliant: need a re-think... maybe mains power...
On your reed relay point, yes, true, but I meant a SPNC relay, so no power in the 'off' state when the time is being displayed.