For everyday riding conditions, the obvious place for the battery is the rear rack. It’s the most convenient and logical way to carry extra weight on any bike. That’s why bicycle commuters usually carry their stuff on the rear rack. It just makes sense.
Some avid cyclists prefer to have the weight of the battery more evenly distributed on the bike with a lower center of gravity — especially for off-roading.
Pedego offers both options, and the difference is hardly noticeable for most people.
For casual riding, or commuting on typical streets and paths, it’s six in one hand, half a dozen in the other.