In one of my project I gave, 12v 1A raw voltage to VIN of Arduino Nano. It works really well till now. My initial idea was to use a linear regulator like LM7809 but ended up sensing a lot of heat from LM7809, so connected the 12v directly to VIN with a capacitor in between.I think you can connect directly to VIN, anyway wait for the reply of other experienced members.
You could do that, or provide the 8.6V to the barrel jack or Vin. Check that the UBEC is actually producing5V with a multimeter if you want extra confidence. 5V is 5V however many amps can be sourced.It is wise to add a fuse before the UBEC since LiPo packs can generate very large currents if there is a short circuit - a fuse will prevent the wiring melting in that situation (that is the role of fuses). Basicallytake care to avoid short-circuits when using high-current supplies and batteries.
If the OP's UBEC is switch-mode it will generate much less heat anyway. We don't know if much of the 3A is needed or not by the Arduino circuit anyway.
Yes the UBEC is giving 5.2V roughly, I checked. Moreover if I just power up the Arduino with the batteries directly into the barrel jack is it okay?
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