Just an update for those that are interested in these batteries. Loaded them into my Sennheiser guitar wireless after charging them for about 2 hours (I'm sure they were partially still charged from the factory). Wireless has 3 bars for battery life, 3 bars is for the first 3 songs with fresh batteries, 2 bars are for the rest of the gig and most of the next one and 1 bar means you have about 2 songs to change these. Usually I could get a gig and a half with batteries, but the life would be as I listed above. With the new batteries, I got through a whole set and still had 3 bars, end of the night had 2 bars, so not sure how drained the ended up, but already seem better than the red Duracells I was using.
I'll be testing out the 9v's mentioned above tomorrow night acoustic for only 2 hours.
