NIMH Battery excedes charge limit when plugged into Tenergy Charger?
It's fine. If your cells are rated for a nominal 7.2 volts that means it's 7.2/1.2=6 cells. When charging NiMH's especially when you're charging them fast, the voltage can get up pretty high relative to the nominal voltage.

As you can see from the picture the charging voltage can get up to something around 1.5V per cell. With your battery pack that means you can go up to 1.5*6 or 9 volts before you're going to see the end of the charging cycle. If it gets up to a voltage much higher than that, then you should start getting worried.
NiMH's aren't charged with a constant voltage, they're charged with a constant current and then they're either cutoff with a timer (poor), a negative delta-V (ok), or a slight temperature rise (better). So don't be surprised if voltage is a secondary concern when you see the chargers doing what they do.