Film cameras
Rollei 35 battery
1 × 1.35V mercury (legacy) button cell
The Rollei 35 family meter was designed for a 1.35V mercury PX625. Modern options include Wein MRB625 zinc-air or an adapter path (fit can be tight on some bodies). Alkaline 1.5V lookalikes can meter wrongly. The shutter is mechanical — only the meter needs a cell.
How to replace it
| Compartment | Meter battery compartment in the camera body |
|---|---|
| How to open | Open the meter battery cover; insert a 1.35V-class PX625 replacement or adapter path. Match polarity. |
| Orientation | Follow polarity marks |
| Low battery indicator | Meter needle becomes unreliable when the cell is weak |
| Notes | Some Rollei 35 bodies are tight for bare Wein MRB625 — adapter rings are commonly used. Confirm fit for your variant (35 / 35S / 35T). |
| Access | Tool-free |
Important
- Meter was designed for 1.35V mercury PX625 / PX13 / MR9 — not a 6V AE-1 cell.
- Alkaline LR9 / 1.5V lookalikes can fit and still meter wrongly.
- Wein MRB625 or adapter + silver-oxide / zinc-air paths are common; fit varies by body.
- Mechanical shutter works without a battery; only the meter needs power.
- Keep button cells away from children.
Sources
Helpful for this device
Optional tools for opening, testing or charging — separate from the battery answer.
- Fluke 101 Digital Multimeter
Accurate open-circuit voltage and basic electrical checks
- Klein Tools MM400 Multimeter
General DC voltage checks including battery terminals
- Digital multimeter
Measure open-circuit voltage and general electronics checks
New battery but still not working?
A fresh 1 × PX625 should restore Rollei 35 if the battery was the problem. Work through the checks below before replacing the device.
- Check orientation
Confirm the cell is seated correctly: Follow polarity marks
- Check the battery type
This device needs 1 × PX625 (mercury_oxide_legacy). Rechargeable cells are not supported for this device. Same size does not always mean the same battery.
- Check known model-specific issues
Meter was designed for 1.35V mercury PX625 / PX13 / MR9 — not a 6V AE-1 cell. Alkaline LR9 / 1.5V lookalikes can fit and still meter wrongly. Wein MRB625 or adapter + silver-oxide / zinc-air paths are common; fit varies by body.
- Confirm the battery itself
Try a known-good fresh cell of the exact code listed above.
- Still not responding?
If a correct, fresh battery installed properly does not restore the device, the fault may be elsewhere — the device may need service or replacement.