I tried out a new set of rechargeable NiZn batteries today, they started out at 14.5 volts and I hunted all day long from 8 am to 4 pm the batteries ending voltage was 13.4 volts, while I used them in my v3i all day I had to replace the recharcheble 2500 mah batteries in my headphones twice, so I think I will be getting more NiZn batteries to be used for my headphones, awesome batteries at a great price, 2 chargers w/8 batteries for $31.00.

sarge