In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

Hey, why not...

cutting off power completely when no button is down is the best energy-saver I can imagine. The only point is that you may not release the buttons before the SX has done its job sending data via the transmitter. Maybe, a larger elcap across the SX Vdd-Vss pins can hold enough energy to complete the task when a "fast pusher" uses the device. One of these gold-cap parts with very high capacity might do a nice job. I used it many years ago (at pre-SX times) to keep a PIC controller alive for a while.

Concerning your amhour question:

as a rule of thumb, a device with a capacity of one amphour can supply one Ampere for one hour at a voltage within the specified voltage tolerance range. Your calculations are right, to my opinion.

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