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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@DrAzzy
I'll check 3.3 rail tonight. When plugging it in after having had it on battery, I can connect, but that's it - nothing I type does anything until I reset the espruino.
Problem sorted, nothing to do with the battery stuff, except that I happened to do a lousy job of installing it.
The key was when I tried connecting over the bluetooth links, and discovered that I could connect to bluetooth, but it endlessly complained about syntax errors. A brief investigation found a solder bridge between UART_RX and UART_TX on the HC-05 (I'd been working in that area), and fixing that has solved the problem.
Seems to be working fine, and battery voltage is falling very slowly, as expected (measured by dividing VBAT with a pair of 10k resistors and running that to an ADC input)