Hey guys, hope all is cool with you folks.
I want to use the batteries in the link below for a small form project using the Arduino Pro-mini.
As you can see the batteries are 3.7 V each and obviously won't power up a ProMini.
Is it okay to put these LiPo batteries in series and get 7.4V?
I ask this because I am concerned that there might be some voltage imbalance of some sort ( or other unknown electrical variable) that might start a fire. I heard LiPos are pretty moody.
( I know this is not an Arduino related question, but I hear how LiPos are easy to catch fire if you do the wrong thing with them. In consideration for safety, I am asking this question )
Charge them individually, and watch them over their life to see if either starts to discharge and charge differently to the other.
Replace cells that can’t keep up.
And all the other precautions you are running into.
Tip: spare a pin on the microprocessor to measure the battery voltage and alarm or take action if you discharge below, say, 3.3 volts per cell under load.
That they really don’t like…
Also watch that cheap charger and flunk it if it ever goes over 4.2 volts per cell, or be there to remove cells when it is about to.
AND if you do god with 7.4 volts, and a 5 volt Arduino, consider using a buck regulator to give you the 5 volts, your battery will last longer if you get a decent one. See
and go conservative on the specs, test with the load you expect.
Hey ty for the reply. from what aarg said above, it looks like my Pro-Mini will work with one 3.7LiPo cause my ProMini runs on 3.3V. Ty again for the reply!
That project incorrectly runs the Nano on 3.7V. It's out of spec, but the maker probably found that it worked and plowed on... but you could do it safely with a 3.3V Pro Mini.
