I want to preface this by saying that I'm a beginner and this might be a very silly question but I've spent a while looking at datasheets and online forums and I still don't get this.
I'm trying to select a charger for a project where I'll be charging a Li-ion battery pack with a dynamo hub installed on a bike. Most of the charger ICs I've come across say that they support n cells in series where 1 <= n and at most I've seen 8 or 6 cells being supported by the charger IC.
The typical circuits in the datasheets for these charger ICs show n cells connected in series. My question is, if a charger supports 2 cells does that mean it can support both 2 cells in series and alternatively 2 cells in parallel? I'm confused because if you connect two cells in parallel the charger would see about 3.6V across them and it sees 7.2V if you have 2 in series. In the parallel case, does the charger know that its actually two cells or does it think its one cell with twice the capacity of a single cell?