I would like to ask if anyone has powered the mkr board with a LiPo battery connected to the JST interface while the board is plugged into the MKR connector carrier.
I can see the +3.3 and +5v screws are outputs while connected to the connector carrier since power is expected to be provided from the supply-1 screw, regulating the incoming voltage and feeding the mkr board through the Vin pin. The pins 5V and VCC seem to become outputs then, not sure why and what for. So, since I an not connecting anything into the power IN screws of the board, would it work with just the battery JST connector? Do I need to protect it somehow?
I could not find how the battery pins are connected to the rest of the mkr board at the schematics https://content.arduino.cc/assets/MKRGSM_V2.3_sch.pdf after 15 minutes staring at it. The pins VBAT are show in both pages and I cannot make much sense out of it. Perhaps I am not understanding the mkr battery pins. Are they meant to charge the battery when power is provided into the Vin pin?
the Carrier's connectors have power from the MKR board's 5 and 3.3 V pin.
the MKR can be powered from the Carrier over MKR's Vin.
the MKR can charge the battery .
So I have a choice whether to use or not the power input of the carrier if the battery is plugged in, right?
Is it documented how much current is the mkr able to send into the battery? Would it be able to charge a pair of batteries in parallel of 3.7 volts and 3000mAh? I read everywhere it was meant for a single battery, but I'd like to know.
For the gsm mkr board the current requierement is much higher, at least two amperes. I purchased a couple of 3000 mAh batteries.
But i feel the builtin charger should have a maximum current output, limiting the number of lipo batteries we can stack in parallel while being able to charge the pack properly (even though more slowly).
The datasheet of chip bq24195L at https://www.ti.com/lit/ds/symlink/bq24195.pdf states that the limit is 2500mA as the output charging current, but if feels too big and i am worried that the board could not be adapted to provide that much even when powered by the connector carrier extra juice source.