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#* Includes GPIO connections for user input and an LED for input confirmation
#* Available for about U$1.90 in bulk
# An LiR2050 A rechargeable lithium coin ion cell#* LR2050 ruled out, 16850 under consideration
#* This battery was selected because it has a nominal voltage of 3.6v (though a charged cell can output up to 4.2v). The ESP12F has a nominal supply voltage of 3.3v, but 3rd party reports suggest that it can be powered by 3.0-4.2v. Below about 3.0v, the wifi circuitry does not perform well.
#* Energy storage is low, about 1101200-120 2500 mAh#* Peak current output is theoretically insufficient for the ESP12F, but initial tests confirm that this combination could work (a capacitor across the ESP12F power terminals might be required?)#* Available for about C$0.80 in bulk#* This cell is quite thick (5mm)
#* There may be challenges getting this shipped to us in bulk - there are tight regulations about the transportation of lithium cells
#* Initial tests suggest that this cell might work as a direct power supply without any additional regulation or boost circuitry