Building 2s3p Battery Pack with 18650 Cells

Thread Starter


Joined Aug 14, 2019

I am building a rechargeable battery pack to power an arduino mega with Samsung 30Q 18650's. I am putting the cells in a 2s3p configuration. I have never built a battery pack before so I am a little lost on how to wire everything up for charging and what kind of charger to use. Any help on how to do this is greatly appreciated.



Joined Sep 7, 2010
You just need one of these , $1 on eBay ... it protects from over charging and everything imaginable , just have to supply 9V , many different types , if you have a 12V supply you can probably find one that can take 12V...

If you haven't bought the cells yet they can be found with tabs which makes connection easier . Solder it all together in one package , just two wires out for power and 2 wires in for charging .