PlainBattery — Battery Cross-Reference Guide

14.5mm × 50.5mm Battery Equivalents

2 model(s) use the same nominal 14.5mm × 50.5mm outline. They span 1.2, 1.5V and Alkaline, NiMH, so physical fit alone does not prove that one can safely replace another. Compare the printed code, voltage, chemistry, and device requirements before buying.

Same-size model comparison

ModelVoltageChemistryCapacityNominal sizeCommon labels
AA1.5VAlkaline2000–3000 mAh14.5mm × 50.5mmLR6, 15A, MIGNON
NiMH AA1.2VNiMH1900–2500 mAh14.5mm × 50.5mmHR6, ENELOOP-AA

Which same-size batteries can replace each other?

The checks below compare each pair by size, voltage, and chemistry. “Closest match” still requires confirmation of drain rating and terminals; “conditional” means the device manual decides; a voltage mismatch means the pair must not be substituted.

AA vs NiMH AA

Do not substitute

1.5V and 1.2V are different electrical classes. Matching dimensions do not make them interchangeable.

How to measure a battery with calipers

Battery dimensions are nominal and small manufacturing tolerances are normal. Dirt, a bent wrapper, raised terminals, or squeezing the jaws can shift a reading by a few tenths of a millimeter. Use the code on the old cell as the primary identifier and measurements as a check.

  1. Remove the battery and wipe the faces and edge clean. Do not measure it inside the holder.
  2. Close and zero the digital calipers, then measure the widest diameter without squeezing.
  3. Measure body thickness across the flat faces. Avoid raised button terminals or welded tabs.
  4. Repeat each measurement after rotating the cell. Treat about ±0.1–0.2 mm as normal measuring variation.
  5. Finally confirm the printed voltage and chemistry. Never select a replacement from dimensions alone.

Related battery comparisons

Review record and primary sources

Reviewed by PlainBattery Technical Review Desk on 2026-08-25. Checked: shared nominal dimensions, voltage and chemistry differences, pairwise replacement guidance.

  1. Energizer E91 / IEC LR6 AA Product Datasheet — Energizer Brands, E91NA1018. AA dimensions, chemistry, voltage, shelf life and load-dependent capacity.

Revision record: source citations and field-level review scope added September 11, 2026. See our sources and methodology and corrections policy.