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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.
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Pico chip chip STM32F401CDU6 6.3.1 General operating conditions - p. 60 - and Table 15.
Features depending on the operating power supply range - p. 61 - specify what you can expect... The current schematics gives you protection great operation stability. Feeding of 3V would have to happen very directly - 'behind (regulator) enemy lines' - with no poly fuse and voltage regulator and... I]m not sure if you can connect the battery+ right 'behind' the voltage regulator without permanently removing it...