GP Lithium 9 V Block Batteries, 9 Volt Lithium Li-MnO2, 10 Year Battery Longlife Ideal e.g. as a Smoke Alarm Battery, for Fire Detectors, Microphones etc: Amazon.de: Electronics & Photo
Duracell Batterie Plus 9 Volt Block im 1er Pack: Amazon.de
GP Lithium 9 volt block batteries, 9 V e-block, 10 year battery long life (5 block batteries), ideal for e.g. smoke detectors, fire detectors, microphones etc.: Amazon.co.uk: DIY & Tools