Hello,
I would like to monitor a 3S or 3S2P battery. All of the fuel gauges I’ve seen are for single cells. How do I do this, and does SparkFun sell anything that would help me?
Unfortunately, we do not have multiple cell fuel gauge breakouts available at this time.
Unfortunately we don’t carry anything that would work. 
I’ve wondered about this too, maybe in the future we can put something together.