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
Amazon.com: MaximalPower 9 Volt Li-Ion Rechargeable Battery HIGH CAPACITY 550mAh 9V Block : Health & Household
VARTA Lithium 9V Block 6LR61 Batteries (1-pack) - ideal for digital cameras, toys, GPS devices, sporting and outdoor applications: Amazon.co.uk: Electronics & Photo
POWEROWL 9V Battery, Lithium Ion Rechargeable Batteries, 9V Block, Rechargeable Batteries, 600 mAh, Pack of 4: Amazon.de: Electronics & Photo
Amazon.com: Amazon Basics Single 9 Volt High-Performance Lithium Battery, 10-Year Shelf Life, Long Lasting Power : Health & Household
Amazon.com: Energizer 9V Lithium Batteries, Ultimate 9 Volt Battery Lithium, 1 Count : Health & Household