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Originally Posted by MikeS
. Probably the best option would be to have a choice: 'hard switch off' (maximum energy save, longer start up) and 'normal switch off'. Unfortunately first Sony firmware update was far from perfect so I'm afraid they won't solve the battery problem anytime soon.
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Another option might be to add a physical power switch, in line with with battery. The simplest way would be something like a magnetic reed switch, which would require you to put a magnet over the "magic spot" when you want to hibernate the device. Or, if you don't use the MP3 player, it might be possible to re-purpose the headphone jack so that if you plug something into it, it disconnects the battery.
Another approach would be to put a MOSFET (solid state switch) between the battery and the circuit board, then toggle it on and off with a repurposed volume up/down switch.
There may be a less crude approach by forcing the CPU into/out of a standby state, interrupting the clock, etc. but that would require a lot of research and some more complex circuitry.
I'm not sure what the side effects would be; certainly the time-keeping would be stopped. And obviously the warranty would be out the window
It would be nice if Sony took MikeS's suggestion and put in "storage mode" in the firmware.