HI
thanks for the reply..
Cant really use an Eeprom at this point.. (audio files are user changeable)
The SD card seems to work fine at down to even 2.8-2.9......
As far as battery 'size' goes... 'coin cell' sized.... but can be a bit 'bigger' in OD than the 2032... up to maybe 23mm...
as far as 'long'... not much. normal 'height' of a coin cell..maybe a bit bigger then the 2.5mm of the 2032.. but not much..
I think I have seen +3.3v and +3.6v coin cells before? (I'll have to search around a bit)...
maybe one of these will give me the 80-100mA I need?