Zinc-air
675 / PR44 battery equivalent
Buy675Zinc-air · 1.45 V · 11.6 × 5.4 mm
Safe swap, same cell: PR44 · 675A · DA675 · AC675E/EZ · AC675 · P675 · PR675H · ZA675
Can I use one of these instead?
Also printed as: PR44
1.45 V (1.4 V on the other cited source) · 11.6 × 5.4 mm · Zinc-air hearing-aid cell
Size 675 is zinc-air, Renata IEC PR44, 11.6 × 5.4 mm, 660 mAh, 1.45 V on the Renata chart. That outline is also LR44 and also 357/303. The chemistry is not. A 675 belongs in a hearing aid, tab removed when it is fitted, holes left open to air. It does not belong in a calculator that asked for an LR44.
| Chemistry | Zinc-air hearing-aid cell |
|---|---|
| Nominal voltage | 1.45 V (1.4 V on the other cited source) |
| Diameter × height | 11.6 × 5.4 mm Renata scope chart. Energizer's zinc-air manual states a system nominal of 1.4 V, which is also shown. |
| Designation on the datasheet | PR44 |
Can I substitute it?
Same millimetres as LR44 and 357, different chemistry and a different voltage class (about 1.4 V zinc-air versus 1.5 V alkaline versus 1.55 V silver oxide). Do not cross them.
Size check at real size
Lay the old cell on the outline. This shows the top outline (diameter) and the side outline (height) at 1:1 once the screen is calibrated.
675 outline, 11.6 × 5.4 mm. Not a photograph, drawn from the figures above.
Calibrate this screen
Screens scale pages differently, so true size is only true after calibration. Hold a bank card or ID card (85.60 mm wide, ISO/IEC 7810 ID-1) against the bar and slide until the bar is exactly as wide as the card.
Saved in this browser only.
All cells on one true-size sheet
When printing, set scale to 100% or Actual size, not Fit to page.
Capacity
| Source | mAh | Test as printed |
|---|---|---|
| Renata | 660 | Capacity column of the July 2016 scope chart. |
Cross-reference
Each code is printed on the cited chart. A shared outline is not, by itself, the same cell.
| Where it is printed | Code |
|---|---|
| Rayovac | 675A |
| Duracell | DA675 |
| Energizer | AC675E/EZ |
| Energizer | AC675 |
| Power One | P675 |
| Panasonic | PR675H |
| Toshiba | ZA675 |
| IEC | PR44 |
| Energizer guide | PR675 |
| Energizer guide | 675HPX |
Devices named on the Energizer guide
Hearing aids. See hearing aids.
Same outline
- SR44SW Silver oxide, low drain (Renata scope chart) · 1.55 V · 11.6 × 5.4 mm
- SR44W Silver oxide, high drain (Renata scope chart) · 1.55 V · 11.6 × 5.4 mm
- LR44 Alkaline manganese button · 1.5 V · 11.6 × 5.4 mm
Zinc-air hearing-aid cells
Hearing-aid cells are zinc-air. The cathode is oxygen from the room, let in through holes that ship sealed under a tab. Energizer's zinc-air manual gives the system a nominal voltage of 1.4 V, says the cell is at its best when the capacity is used within a few weeks of pulling the tab, and says that in a hearing aid it can replace a silver-oxide cell and usually run longer. Renata's scope chart rates the same four sizes at 1.45 V. Both figures are printed. Neither has been averaged into a third number.
The four sizes in that chart are 10 (PR70, 5.8 × 3.6 mm), 312 (PR41, 7.9 × 3.6 mm), 13 (PR48, 7.9 × 5.4 mm) and 675 (PR44, 11.6 × 5.4 mm). Size 675 shares its outline with LR44 and with the 357/303 silver-oxide cell. The chemistry does not. A 675 with the tab pulled will dry out in a watch drawer. A watch does not give it the air path a hearing aid does. Leave zinc-air in the hearing aid.
Energizer's product datasheets for these four sizes were not at the old PDF addresses when this index was built, so the milliamp-hour figures below are Renata's, from the scope chart, and the cross-reference codes (AC13, PR48, and the rest) are from Energizer's battery replacement guide. Tab colour is not listed, because it was not on the documents we kept.
Sources
Last verified 2026-10-29.
- Renata scope of supply, consumer, part no. ZW9843, version 07.2016 Renata SA, checked 2026-10-29
- Energizer zinc-air application manual Energizer, checked 2026-10-29
- Energizer battery cross reference guide Energizer, checked 2026-10-29