SR621SW: THE HOGWARTS BATTERY POWERING TIME & MAGIC

The Leaky Cauldron’s Hidden Alchemy Behind the creaky floorboards of Quality Quidditch Supplies and the flickering candlelight of the Leaky Cauldron lies a magic even Dumbledore might envy: the SR621SW—a 6.8mm x 2.1mm silver-oxide button cell, small as a Galleon but mightier than a well-cast Protego. While flashy lithium-ion packs strut