Hello and Welcome,

When driving normally, the NAH system is designed to have the charge meter hover in the upper third range.

The meter does not show full charge or empty as ether extreme would damage the life of the battery.

A common misconception is that if one motor is running the other is not. Most of the time both are running except for stop, EV mode, or when the charge is low. This is why it stays in the upper third. Energy is constantly going in and out.

On a long down grade or after a long period of coasting with light breaking, you could see the meter hit the top, but I have only seen this happen 4 or 5 times in 12,000 miles.

I have also seen it empty. When this happens the engine comes on until it's back in the upper third. This happens a lot in NJ traffic jams.