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GP AL4 MONO: Alkaline battery, D (Mono), 4 pcs. at reichelt elektronik
D battery - Wikipedia
VARTA Industrial Pro D Mono Alkaline Batteries LR20 - 20-pack, Made in Germany: Amazon.co.uk: Electronics & Photo
Duracell Plus Power Battery D Mono LR20 MN1300, 4 Pack
Amazon.com: VARTA Longlife Max Power D Mono LR20 (2-Pack) Alkaline Batteries – Made in Germany – Ideal for Toys and Everyday Devices : Tools & Home Improvement