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Will i be able to recharge the battery if i attach VDD?
you mean 3.3V? no, the battery is 3.7-4.2V but you can attach 5V like it was meant to be used when the device is closed. You could even do it with Pico - take 5V feeding the Pico and connect it to 5V charger input pins on the watch. Just ignore the 3.3V
fanoush
So i wasn't even able to program it without the battery using my raspberry pi pico board. Don't know why? pico should be able to produce up to 300mA?
But it doesn't really matter anyway because when reattached the battery and try and program it i get "Device has AP lock engaged". So i'll have to use a real segger programmer anyway and completely erase the chip.
Will i be able to recharge the battery if i attach VDD?