Duracell SpecialtyAlkaline AAAA Battery 1.5 V, Pack of 2 (LR8D425) Designed for Use in Digital Pens, Medical Devices and Headlamps: Amazon.co.uk: Electronics & Photo
Duracell MN2500 Ultra AAAA battery AAAA Alkali-manganese 1.5 V 600 mAh 2 pc(s) | Conrad.com