Seeeduino 2.2 on battery power?

I would like to run at 3.3V for longest battery life in a portable Camera Controller based on Seeeduino 2.2

External power goes through 2 regulators: 5.0 and 3.3 to the 328 chip.

Could I route external battery power directly to the 3.3V regulator for lowest drop-out voltage?? What precautions should I take?

What is the drop-out differential voltage for the 3.3V regulator?? Would be NICE to run on a 3.7V LiPo cell like a cellphone battery!

Any comments / suggestions appreciated…

Regards, Terry King …On the Red Sea at


Sorry for the late reply.

The 3.7V battery is not suitable to power the seeeduino v2.2 via external power, because it will first route 5V regulator, then 3.3v regulator, and will be not enough power for seeeduino v2.2.

Maybe you can use this method:
First, switch the switch to 3.3V.
Second, connect the positive of the battery to the 3.3V pin of the seeeduino v2.2, and the negative of the battery to the GND of seeeduino v2.2.
So the battery can supply 3.3V power for the seeeduino, and it will work well.