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 ...

According to the company, the new system uses a 2.5-liter flat-four and has a "series-parallel" hybrid system ... The new system features a 1.1-kWh battery and a 118-hp electric motor.