Hearing aid battery size chart

Tab colour → retail size → IEC / ZA code. Match the empty pack — sizes are not interchangeable.

For disposable zinc-air trays only. Sealed rechargeable aids use a built-in pack — this chart does not apply. Not clinical or fitting advice. Fuller hub: hearing aid battery sizes.

Retail size	Also called	Tab colour	Approx. size	Notes
5	PR63 / ZA5	Red	~5.8 × 2.15 mm	Rarest retail size — some older CIC aids only. Not interchangeable with size 10.
10	PR70 / ZA10	Yellow	~5.8 mm	Smallest common disposable size (Phonak Virto size-10 class examples).
312	PR41 / ZA312	Brown	~7.9 mm	Very common RIC / small BTE size (Phonak Audéo / Bolero / Terra 312-class examples).
13	PR48 / ZA13	Orange	~7.9 × taller	Common BTE / larger aid size (Phonak Audéo 13T / Naída SP-class examples).
675	PR44 / ZA675	Blue	~11.6 mm	Larger power / UP-class packs (Phonak Naída / Sky / Terra UP-class examples).

Peel the tab when ready, wait about a minute for air activation, then insert. Keep button and zinc-air cells away from children and pets.