LR621 vs LR626: battery 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.

Verdict: Same diameter · different height
Confidence: 98%
Reviewed: 2026-08-25

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.

Specification	LR621	LR626
Dimensions	6.8 × 2.1 mm	6.8 × 2.6 mm
Nominal voltage	1.5 V	1.5 V
Chemistry	Alkaline manganese dioxide	Alkaline manganese dioxide
Rechargeable	No	No
Typical use	Toys, calculators, small lights	Toys, calculators, small lights

View LR621 profile View LR626 profile

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.

What changes when the chemistry changes

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.

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

International Electrotechnical Commission — IEC 60086-1:2026 — Primary batteries, general requirements
Primary-battery nomenclature, form, fit, function, terminal and electrochemical-system framework.
Energizer — Battery Replacement Guide
Cross-reference codes and manufacturer guidance to replace the same size and type together.
Duracell — Battery Cross Reference Chart
Independent manufacturer cross-reference families and corresponding product numbers.
Duracell — Battery chemistry technical bulletins
Alkaline, lithium-manganese-dioxide, zinc-air and silver-oxide chemistry behavior.