GP Lithium 9V Block Batteries Long Life 9 Volt Lithium Li-MnO2, 10 Pieces 9 V Block Lithium, Ideal as a Smoke Alarm Battery, for Fire Detectors, Microphones etc: Amazon.de: DIY & Tools
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Varta 1/2 AA with Pins, Battery Capacity: 950mAH, Voltage: 3V