Is it possibile to power the board B-G431B-ESC1 with a 2s battery pack? I look the schematic and there is not an electronic limitation (all the components and uP are powered with +5 or +3.3) , so I wnat to know, why there is this limitation.

[FRagg.1]

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[Peter BENSCH]

No, as you can find in UM2516 the B-G431B-ESC1 is targeted to 4s applications. There you also find the schematics of that board containing e.g. the MOSFET drivers, And those drivers are supplied with a voltage of 10V, which is regulated down from the battery voltage using a L7986TR (step down switching regulator).

Does it answer your question?

/Peter

[FRagg.1]

I want to provide the 7V (2s conf) directly on the +10V line; I want to create a link from the external power supply and the positive side of C42 or C45 by means a little wire soldered on the appropriate terminal of the capacitor. Obviously, I will not power the L7986TR. Do you think that there is some restriction on this workaround?

[Peter BENSCH]

The MOSFET drivers are L6987E, which has a VCC undervoltage turn-on threshold of max 6.5V, so the margin to 7V is really small. Please consider possible voltage drops at V+ due to the discharge profile of your cells.

/Peter