> especially if it is high
Like the body of a larger person or a person wearing a backpack?
I mean where you mount the battery pack on the bike. On a rear rack above the tire is probably the easiest but its not great for stopping or handling, especially if its more than ten pounds.
On the down tube is better. Carrying the batteries in a back pack can be done. I did that for a few months.
You can shift towards the back of the bike with your body for instance.