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Alkaline button

LR726 battery replacement and equivalents

LR726 is a 1.5 V alkaline manganese dioxide button battery measuring 7.9 × 2.6 mm. Match the complete specification before treating another marking as a replacement.

Technical content reviewed 2026-08-25

AG2
Nominal voltage
1.5 V
Dimensions
7.9 × 2.6 mm
Chemistry
Alkaline manganese dioxide

LR726 specifications

Canonical codeLR726
Formbutton
RechargeableNo
Drain markingNot specified

Typical applications

  • Toys
  • calculators
  • small lights
  • simple electronics

Replacement decision

Resolve the original marking to this profile, then confirm nominal voltage, chemistry, dimensions, polarity and any drain or terminal suffix. Capacity alone does not establish interchangeability.

Exact equivalents and aliases

LR726 is a 1.5 V alkaline button cell; AG2 is its reviewed alias. Profiles 396 and 397 occupy the same 7.9 × 2.6 mm envelope but use silver oxide, so their physical fit does not make them exact LR726 equivalents.

AG2 resolves to LR726 in the normalized catalog. A marking that says SR726W or SR726SW belongs to a different chemistry family and should be read as a comparison, not an alias.

MarkingCatalog profileVoltageChemistryDimensionsDecision
LR726 / AG2LR726 · Alkaline1.5 VAlkaline manganese dioxide7.9 × 2.6 mmExact alias / canonical profile
Resolves to LR726; verify polarity and the device marking.
  • Canonical code and reviewed aliases resolve to one profile.
396396 · Silver oxide1.55 VSilver oxide7.9 × 2.6 mmSame fit · different chemistry
Use only when the device maker explicitly approves both chemistry systems.
  • The physical envelope matches.
  • Nominal voltage is close.
  • Chemistry and discharge behavior differ.
397397 · Silver oxide1.55 VSilver oxide7.9 × 2.6 mmSame fit · different chemistry
Use only when the device maker explicitly approves both chemistry systems.
  • The physical envelope matches.
  • Nominal voltage is close.
  • Chemistry and discharge behavior differ.

Conditional substitutes

396 (SR726W) and 397 (SR726SW) are same-size silver-oxide candidates. A device that specifies alkaline LR726 should not be changed to one of them solely because the diameter and height match.

Physical fit is not electrical compatibility

The 2.6 mm height is useful for checking whether a candidate can seat in the holder. The electrical decision still depends on chemistry, voltage and the application’s drain requirement.

How to verify before replacing LR726

  1. Keep AG2 and SR726 markings separate when reading the old cell.
  2. Compare the chemistry and nominal voltage, not just the 7.9 × 2.6 mm envelope.
  3. Confirm polarity and the device manual before accepting a same-size silver-oxide cell.

Continue with: Compare the LR754 family Read the complete button-cell code Measure a button cell

Same-size batteries to review carefully

These profiles share the nominal physical envelope. They are not automatically equivalent.

396 Silver oxide 1.55 V 7.9 × 2.6 mm 397 Silver oxide 1.55 V 7.9 × 2.6 mm

Reviewed comparisons

LR726 vs 396Same fit · different chemistryLR726 vs 397Same fit · different chemistryLR726 vs LR721Same diameter · different heightLR726 vs LR736Same diameter · different height

Technical sources

  1. International Electrotechnical Commission — IEC 60086-1:2026 — Primary batteries, general requirements

    Primary-battery nomenclature, form, fit, function, terminal and electrochemical-system framework.

  2. Energizer — Battery Replacement Guide

    Cross-reference codes and manufacturer guidance to replace the same size and type together.

  3. Duracell — Battery Cross Reference Chart

    Independent manufacturer cross-reference families and corresponding product numbers.

  4. Duracell — Battery chemistry technical bulletins

    Alkaline, lithium-manganese-dioxide, zinc-air and silver-oxide chemistry behavior.