That seems highly implausible, as the MT7688 isn't really designed for battery operated systems.
What you should probably do is use a microcontroller intended for ultra low power / sleep mode / wake on interrupt operation.
Have that occasionally power up the MT7688 (USB power switch, regulator with enable, etc) when it needs wifi. Make sure you either have no persistent file system state, or do an orderly shutdown each time.
Also consider if there may be another wifi solution that is a better fit for your application.
Info seems to be inconsistent and probably due to different designs from various manufacturers.
Also LiFePO4 is so new thus no long term stability report.
One thing that seems to be true is it does not have the same problem as Li-Ion/Li-Po (Li-Cobalt) as it has gas swelling problem -- and dead, when fully depleted.
I've seen one factory recommendation:
do not deplete below 2V and never go below 1.5v (as has potential to shorten the number of recharge cycles/usable life.)
i decided to start building my boards this weekend. maybe someone can guide me on the regulator, the board print states cj1117 3.3v regulator. a search brings the news that this reg. is no longer produced. fine, no biggie, i went for an aws1117 3.3v , however, although it is, according to pictures on the net, the same body style. the spacings on the board are too small and the female header prevents the single , i guess ground leg on one side from a proper positioning on the pads.
can anyone who has finished building this board suggest a regulator that is 3.3v 1amp and can fit ok on the pads? thanks
@fossette A passive resistor is in no way a better solution, it's still the wrong way of going about it. It was simply to confirm that OP's problem was a power-supply issue, which it was, and it's now solved. The proper way of doing it would still be a linear voltage-regulator or a small SMPS, and he did mention he is looking into a proper power-supply now.
It might be possible, if the cell phone charger provides 5v. The standard iPhone brick does not provide enough to power mine, but I am using a BlackBerry one I had sitting around. I am also a fan of the Anker charging hubs, I have a few of those around as well, so I can charge multiple USB devices (GoPros, helmet cam, phone, tablet) at once. that works as well.
Check the power output to verify it is pushing enough.
@Scott-W-Wood I can only reply in connection with the original Omega and original Arduino Dock - I have not yet received my Omega2 and new Arduino Dock R2 - there is no documentation I can find on the latest versions that would allow me to respond definitively on them, though the photos shown on https://www.indiegogo.com/projects/omega2-5-linux-computer-with-wi-fi-made-for-iot#/ for the Arduino Dock R2 show that there are some differences and I don't know how significant these differences are.
@Clement-Ho Oh, I can solder. I've got a few onion proto boards on backorder (I think they are in the mail). The form factor with the power dock is too tight. It is actually a tug of war between the board and the case where either the case flexes or the board warps. Either way its not ideal. The mini dock would be amazing if I could get a standard PCB board to work.