I am going to a drive in next week and want to use the radio for the sound as i have done with regualr ICE cars. I was wondering if i put the MMH in accessory mode position if it will run down the High Voltage Battery? Does this function work differently than a regualr car. (Doesnt the regualr cars use the alternator to run in accessory mode?) I am not a car buff so i do not know.

This is from the MMH Manual regarding key position:

2. ACCESSORY, allows the electrical
accessories such as the radio to
operate while the vehicle is not