Ultralife-9V-PP3-Battery-Lithium-Ultralife-1200m Ah-9V-Ultralife-Lithium-9-V-Block-This-1200m Ah-9V-battery-from-Ultralife-is-an-extremely-long-lasting-battery-designed-to-operate-over-long-periods-making-it-ideal-for-smoke-alarms-detectors-wireless-security-devices-music-audio-devices-&-medical-devices-Other-features-include-a-high-energy-density-up-to-5-times-more-than-alkaline-up-to-10-times-more-than-carbon-zinc-high-running-voltage-flat-discharge-voltage-curve-wide-operating-te