I know some around here don't believe me. But this seemed like a good time to
throw in my usual rant about batteries.
Yes there are Lithium batteries and other high performance batteries that pack a higher mAH, these should be used for high
power burst applications like running a camera flash. However, for "low and slow" drain applications (like microphones) standard alkaline batteries are the way to go. Among the variety of Alkaline batteries there is VERY little difference in performance between
any brand. This is because
standard U.S. made alkaline batteries are all made in one of three factories. I have a friend who used to design batteries for Duracell. Want to know where they make the super cheap Costco Kirkland batteries or the Walmart brand batteries? Same place as everywhere else. They literally take a
pallet out of the warehouse and slap a different label on them and ship them off to Costco to sell for 20 cents each instead of a $1.50. Don't believe me, take a look at
this chart on the Consumer Reports website comparing the performance of Alkaline batteries... anybody notice a
pattern? They did one a few years ago and they didn't bother printing the chart the simply concluded that all differences fell within the standard
deviation.
When buying batteries I always go with Costco Kirland for AA and AAA. I usually use Walmart or Rayvac for my 9 volts (about $1.25 each). Never had a problem. Saved a LOT of money over the years.
One final note. Modern rechargable batteries are an excellent option for running microphones. They didn't used to be, but now they charge quickly, have high mAH ratings, and last a long time. Invest in some good NiMH's and you'll be very happy.