Just wanted to post about these in terms of using them with the Core-Sound PD-Audio Setup- the ADC by Core (MIC 2496) that I have draws per Core sound 110 mAH without phantom power, so theoretically I would get about 4.5 hours of power. I went ahead and 'bench' tested it @ home and got 2 hours 40 minutes out of them testing with the green leds on the whole time and the red leds flashing pretty much (the max that anyone would use them without overloading their mics) and that is much better then alkalies. Last night hit for my daughter Cat Power @ the Wiltern and got easily over 100 minutes of recording and additionally the power was on a full 1/2 hour prior to the start of the show waiting for the artist to come out. In any case, for those looking for an alternative in this application, they are the way to go. Purchase both the charger and two batteries for less then $100 from the following source:
http://www.thomasdistributing.com/ipower-9v-lithium-rechargeable-battery.php#top