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Size 312 vs Size 13
Size 312 and Size 13 are not interchangeable. They differ in thickness (3.6 mm vs 5.4 mm). The Size 13 holds about 1.7× the energy of the Size 312 (310 mAh vs 180 mAh).
| Size 312 | Size 13 | |
|---|---|---|
| Type | zinc-air hearing aid battery | zinc-air hearing aid battery |
| Voltage | 1.45 V | 1.45 V |
| Size | 7.9 mm × 3.6 mm | 7.9 mm × 5.4 mm |
| Typical capacity | ≈ 180 mAh | ≈ 310 mAh |
| Rechargeable | no | no |
| Other codes | PR41, A312, 312A, ZA312 | PR48, A13, 13A, ZA13 |
Can I use Size 13 instead of Size 312?
No. Hearing aids need zinc-air cells.
Can I use Size 312 instead of Size 13?
No. Hearing aids need zinc-air cells.
Where each one is used
Size 312: receiver-in-canal and in-the-canal hearing aids (the most common size).
Size 13: behind-the-ear and larger in-the-ear hearing aids.
Both sizes turn up in hearing aids, depending on the model, which is why people mix them up: check the code on the old cell.