Looking for some advice:
Was thinking of using an Adafruit powerboost for my Lynx, bypassing the 9v circuitry, but the problem is that the original on/off buttons don't work then, correct?
The Powerboost will switch on if the EN pin is brought to battery voltage and off if grounded, is that correct? If so could you not re-purpose the on and off button to connect the powerboost to Batt+ and GND, or are they hardwired in the flex circuit preventing that?
(Of course another hacky way to do it would be to boost the 5v from the powerboost to 9v using a DC-DC converter like this, I'd lose a load of efficiency and I'd have to switch off the powerboost separately... actually.. that is a terrible idea...)