Battery

PX28

6V silver oxide cell

PX28 / 4SR44 is a 6V silver-oxide photo cell. Mamiya 7 manuals allow 4SR44, 4LR44 or 2CR1/3. Canon AE-1 class bodies also list PX28 alongside 4LR44. See PX28 vs 4LR44 — not a PX625 mercury cell.

Chemistry: silver_oxide
Voltage: 6 V
Diameter: 13 mm
Length: 25.2 mm
Used by: 4 devices

Common uses: Film SLR cameras · Photographic equipment

PX28 Diagram

Brand-neutral outline — confirm the tray in your device.

Other names

Genuine aliases and pack labels for this battery — not substitutes of a different chemistry.

4SR44 · 544 · PX28L

Related codes

Same battery / other names

PX284SR44

Same battery

PX28 is the common photo-trade name for 4SR44-class silver-oxide 6V cells

Same size, different battery

PX284LR44

Same size, different type

Same 6V photo-cell form factor; 4LR44 alkaline vs PX28 silver oxide — not automatic behavioural equivalents

Rechargeables are not equivalents

Do not substitute a rechargeable cell unless the device documentation explicitly allows it. Silver-oxide and lookalike chemistries are not interchangeable with rechargeables by size alone.

Size family

Edge thickness in the 13 mm family — thicker bar means thicker cell. Not to scale. Highlighted cell is this page.

4LR44

25.2 mm

PX28

25.2 mm

Device-specific caveats

From manufacturer-backed notes on devices that use PX28 — not generic advice.

Keep cells away from children.

Devices using PX28

All (4)Film cameras (4)Canon (3)

Used in

Film cameras4 devices

Brands: Canon

Compare

PX28 vs 4LR44Compare

Learn more

Testers & chargers

Optional tools that fit this cell type — only where the chemistry allows. Separate from the battery answer.

Amazon links may earn us a commission. They do not change the battery answer.

Fluke 101 Digital Multimeter
Accurate open-circuit voltage and basic electrical checks
Docs Buy on Amazon More tools
Klein Tools MM400 Multimeter
General DC voltage checks including battery terminals
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AstroAI DM6000AR Digital Multimeter
Budget auto-ranging voltage checks
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Battery tester
Quick good / low / dead check for household cells
Crude check only — does not measure capacity under realistic load.
How to test a battery Buy on Amazon

Buy links are optional and separate from the battery answer.

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