Whatever your reasons, it’s time to put some cells into series. The common notation for battery packs in parallel or series is XsYp – as in, the battery consists of X cell “stages” in ...
He goes on to explain that the size of battery that would be needed for a useful series hybrid would take to long to charge and be too large and heavy to make it perform better than a parallel hybrid.
The device is a secondary (rechargeable) battery pack with an average voltage of 25.6V and a rated capacity of 20Ah. Up to two batteries can be connected in series to produce 48V, and up to ten units ...