I have removed all the solder bridges & links to minimise stray consumption.
When I measure the combined current through JP3 and JP1 (ie, MCU & RF), it is ~0.87mA between Tx pulses.
(SB19,14,17 are removed; JP2 is not fitted - so no current to USB_LRA)
But, when I power the board from the battery, and measure the battery current, I see 1.95mA
(SB18 is removed)
The ST LD39050 regulator (U7) is supposed to be "low quiescent current": the datasheet says it should only, typically, be taking 100uA at 500mA load - so we should be nowhere near that!
So where is this extra milliamp going??
To clarify: the ~0.87mA to MCU & RF is measured while powered from the battery.