Match My Battery

LR621 vs LR626: 2.1 vs 2.6 mm Height

LR621 and LR626 use the same alkaline chemistry and nominal voltage, but LR626 is taller. The catalog therefore treats them as different physical formats, not interchangeable aliases.

Verdict
Same diameter · different height
Confidence
98%
Reviewed
2026-10-04
Same diameter · different height

LR621 and LR626 are different thicknesses

Both cells are about 6.8 mm in diameter, but their heights are 2.1 mm and 2.6 mm.

Use the specified height; do not rely on contact spring travel.

SpecificationLR621LR626
Dimensions6.8 × 2.1 mm6.8 × 2.6 mm
Nominal voltage1.5 V1.5 V
ChemistryAlkaline manganese dioxideAlkaline manganese dioxide
RechargeableNoNo
Typical useToys, calculators, small lightsToys, calculators, small lights
View LR621 profile View LR626 profile

About Confidence: this is a fixed score attached to a comparison rule in the catalog. It is not a probability of working, a measured success rate, or device approval. Read the verdict and its reasons; a high score can accompany a non-equivalence verdict.

Exact aliases, physical fit and electrical compatibility

LR621 and LR626 use the same alkaline chemistry and nominal voltage, but LR626 is taller. The catalog therefore treats them as different physical formats, not interchangeable aliases.

Same chemistry, different height

Both profiles list a 6.8 mm diameter. LR621 is 2.1 mm high and LR626 is 2.6 mm high, so the extra height changes whether the cell seats correctly and whether the contacts close without pressure. The normalized rows give both cells a 1.5 V alkaline specification. That electrical similarity does not cancel the height mismatch; an incorrect case can lose contact or stress the holder.

Application boundary

Choose the complete code printed by the device or measure the removed cell. Do not use contact spring travel as a reason to force a taller or shorter cell into the compartment.

Related decisions: Compare the LR726 family Measure a button cell Read a complete marking

Why this verdict

  • Diameter matches.
  • Height and capacity envelope differ.

What to verify in the device

Check the original compartment label, the current manual, polarity, terminal style and whether the device explicitly permits a chemistry or rechargeable alternative.

Sources for these profiles

  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.

Measure height while keeping chemistry constant

Original measurement worksheet. The LR621/LR626 decision is about height: both catalog rows are alkaline, 1.5 V.

Observe / documentInterpretationNext check
LR621 catalog envelope6.8 mm diameter × 2.1 mm heightRecord the complete original marking before measuring.
LR626 catalog envelope6.8 mm diameter × 2.6 mm heightA 0.5 mm difference is not permission to use spring travel.
Measurement photograph: not includedNo original measurement sequence is claimed hereUse an appropriate non-shorting method under the cell maker’s handling instructions.

Limit: Record units, tool uncertainty and terminal condition. Unknown polarity or an unsafe measurement setup means stop; a nearby size is only a candidate. These dimensions match the cited Exell examples; they are not a universal manufacturer tolerance drawing.

Sources and scope for this exercise

Find dimensional candidates