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Hearing aids: which battery?
Hearing aids take zinc-air cells in four sizes: 10, 312, 13 and 675. The sizes do not interchange. Pull the tab when you fit the cell. Tab colours are not listed here because they were not on the documents used.
Source: Energizer battery cross reference guide, Energizer, checked 2026-10-29. The guide pairs a cell with a kind of device. Your model may take a different cell.