Ultralife Long-Life 9V Lithium Battery-U9VL-JPFP6JN-9V Batteries

• Worlds longest lasting 9V battery - up to 5 times longer than 9V alkaline batteries
• Same footprint as an alkaline 9V battery
• The trusted lithium 9V leader for over 20 years
• Up to 10 year shelf life
• Foil pack

I use this battery in a Shure Beta 58 wireless microphone. Yes you can hear the difference. This battery delivers a solid 8.6v right to end. I get about 48 hours out of it. That's 8 band practices a month, 2 hours each, for 3 months. The battery does suddenly die went it's at the end, no subtle fading out.

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