What is a four-cell battery with the cells connected in series with each other?

How would it look like?

1 answer

line up 4 AA cells, end to end, + to -.
That is an example of 4 cells in series.

Your 12V car batter is another good example of cells in series. I think each cell can charge up to 2.4V, so there are 5 or 6 cells. See

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/leadacid.html