Typical Alkaline Battery Ratings abram, June 29, 2010June 29, 2010 Also posted on the 8088 Networks site. I was using this to create a small external power supply for my Yeasu VX-3R. I used a 9v battery initially and realized that I should use a voltage drop to improve the battery life. Without any sort of voltage drop, the battery was dead in a little over an hour due to the fact that a full 500mA was flowing into the radio. Battery Type Capacity (mAh) Typical Drain (mA) D 12000 200 C 6000 100 AA 2000 50 AAA 1000 10 N 650 10 9 Volt 500 15 6 Volt Lantern 11000 300 Related notes batterycurrentelectrical