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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.
@Frida
http://www.ti.com/lit/ds/symlink/bq27441-g1.pdf
In section: 9.5.4.4
I2C Clock Stretching
I don't know if PICO has clock stretching.
And remember pullup on both SDA and SCL.