Film cameras

Minolta SR-T 101 battery

1 × 1.35V mercury (legacy) button cell

The Minolta SR-T 101 meter was designed for a 1.35V mercury PX625 / PX13. Modern options include Wein MRB625 or an MR-9 adapter with silver-oxide 386. Alkaline 1.5V lookalikes can meter wrongly. The shutter is mechanical — only the meter needs a cell.

Based on: Minolta documentation
Last checked: 8 October 2026
Size: 15.6 × 6 mm
Voltage: 1.35 V
Battery powers: Light meter only — Through-the-lens CLC meter; shutter is mechanical
Works without battery: Yes — Mechanical shutter still operates without a meter cell
Replacement notes: Voltage-sensitive · Chemistry-sensitive · Adapter path · Component / meter only
Rechargeable: Not supported

How to replace it

Compartment	Battery chamber in the camera base
How to open	Remove the battery chamber cover; insert a 1.35V-class PX625 replacement with the polarity shown in the manual (+ side out on many SRT bodies).
Orientation	Follow polarity marks / manual diagram
Low battery indicator	Battery check switch on the base; meter needle check mark
Notes	Turn the meter switch off when storing to reduce drain.
Access	Tool-free

Important

Meter was designed for 1.35V mercury PX625 / PX13 — not a 6V photographic stack and not LR44.
Alkaline 625A / 1.5V lookalikes can fit and still meter wrongly as they discharge.
Common modern paths: Wein MRB625 zinc-air or MR-9 adapter with silver-oxide 386.
Mechanical shutter works without a battery; only the meter needs power.
Keep button cells away from children.

Sources

Last checked 8 October 2026

Minolta SR-T 101 manual extract — 1.35V mercury Mallory PX-625 / PX-13 for the meter
Manufacturer support · finearts.uvic.ca
Bruce Varner — PX625 replacement comparison for Minolta SRT-101 (alkaline vs zinc-air vs MR-9)
Specialist reference · brucevarner.com

Find more Minolta manuals →How we check sources

Need a PX625?

Minolta SR-T 101 uses 1 × PX625.

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Helpful for this device

Optional tools for opening, testing or charging — separate from the battery answer.

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Fluke 101 Digital Multimeter
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Klein Tools MM400 Multimeter
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Digital multimeter
Measure open-circuit voltage and general electronics checks
Voltage alone does not establish usable capacity, especially for rechargeables.
Tester vs multimeter Buy on Amazon

Buy links are optional and separate from the battery answer.

New battery but still not working?

A fresh 1 × PX625 should restore Minolta SR-T 101 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 / manual diagram
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 — not a 6V photographic stack and not LR44. Alkaline 625A / 1.5V lookalikes can fit and still meter wrongly as they discharge. Common modern paths: Wein MRB625 zinc-air or MR-9 adapter with silver-oxide 386.
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.

These checks follow this device’s orientation, battery type, and important notes from the maker.

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