Foolestroue is referring to the fact taht in alternating current, which goes one way and then the other repeatedly, the point where the voltage peaks and falls and reverses on a sine curve may be out of phase where the point where the current follows ITS sine curve. They go out of phase which cause a discrepancy between the current level seen as in phase with voltage, and the current level where it peaks out of phase with voltage. The ratio of "in phase" current to total current is called the power factor.

Power Factor is the ratio of watts (W) to voltamperes (VA).

But since we were talking about batteries, which are simple direct-current devices, power factor doesn't enter into it.

A