1.5 V alkaline button
LR43
BuyLR43Alkaline · 1.5 V · 11.6 × 4.2 mm
Safe swap, same cell: 186
Can I use one of these instead?
- SR43SWFits, read noteSame size, different chemistry
- SR43WFits, read noteSame size, different chemistry
- 350Do not swapDifferent thickness
- SR1136SWDo not swapDifferent thickness
- SR1130SWDo not swapDifferent thickness
- SR1130WDo not swapDifferent thickness
- LR54Do not swapDifferent thickness
- LR44Do not swapDifferent thickness
1.5 V · 11.6 × 4.2 mm · Alkaline manganese button
LR43 is a listed designation for this alkaline manganese button cell, 1.5 V, 11.6 × 4.2 mm. Figures below are copied from the datasheets and charts linked at the bottom.
| Chemistry | Alkaline manganese button |
|---|---|
| Nominal voltage | 1.5 V |
| Diameter × height | 11.6 × 4.2 mm Energizer 186 drawing prints 11.60 mm and 11.30 mm, and 4.20 mm and 3.80 mm. The larger figure of each pair is the maximum. |
| Designation on the datasheet | IEC-LR43 |
| Weight | Energizer 1.5 grams (0.05 ounces) |
Can I substitute it?
Silver-oxide neighbours: 386 and 301. AG12 is a label on the same Energizer cross-reference line as LR43. Same outline, check the chemistry the device asked for.
Size check at real size
Lay the old cell on the outline. This shows the top outline (diameter) and the side outline (height) at 1:1 once the screen is calibrated.
LR43 outline, 11.6 × 4.2 mm. Not a photograph, drawn from the figures above.
Calibrate this screen
Screens scale pages differently, so true size is only true after calibration. Hold a bank card or ID card (85.60 mm wide, ISO/IEC 7810 ID-1) against the bar and slide until the bar is exactly as wide as the card.
Saved in this browser only.
All cells on one true-size sheet
When printing, set scale to 100% or Actual size, not Fit to page.
Capacity
| Source | mAh | Test as printed |
|---|---|---|
| Energizer | 123 | 123 mAh (to 0.9 volts) |
Devices named on the Energizer guide
Watches, medical devices, sporting goods. See watches, medical devices, scales, sports and pet gear.
Same outline
- SR43SW Silver oxide, low drain (Renata scope chart) · 1.55 V · 11.6 × 4.2 mm
- SR43W Silver oxide, high drain (Renata scope chart) · 1.55 V · 11.6 × 4.2 mm
Alkaline manganese button cells
An LR button is zinc/manganese dioxide with an alkaline electrolyte, nominal 1.5 V. Energizer's miniature alkaline handbook puts the open-circuit voltage near 1.6 V and then shows a sloping discharge, and it says the cathode swells as the cell empties. The cell is built to be the cheaper part. The handbook's own rule for using it in place of silver oxide is narrow: only where the device manufacturer recommends the substitution.
The size that dominates the search logs is LR44. Energizer sells it as A76, designation ANSI/NEDA 1166A, IEC-LR44. The current A76 datasheet rates 150 mAh to 0.9 V on 6.8 kΩ at 21°C. Renata's scope chart, July 2016, rates LR44 at 110 mAh and states the outline as 11.6 × 5.4 mm. Same code, two tests, two numbers. The Energizer A76 product page lists AG13 among the labels that A76 replaces, which is why a search for AG13 lands here. It also lists 357, SR44 and SG13. Those last three are silver-oxide designations for the same outline. Energizer is telling you the A76 will fit and run the device. The handbook is telling you it will not hold voltage the way 357 does. Both documents are Energizer's. Fit is not the same claim as service life.
LR41, LR43 and LR54 are the smaller alkaline outlines, Energizer numbers 192, 186 and 189. AG12 and AG10 show up on Energizer's cross-reference on the same lines as those alkaline cells and as the silver-oxide cells of the same diameter and height. An AG10 search is answered with the alkaline LR54 facts, and the silver-oxide neighbours are linked beside it, not folded into it.
Sources
Last verified 2026-10-29.
- Energizer 186 product datasheet (186.pdf) Energizer, checked 2026-10-29
- Energizer alkaline miniature manganese dioxide handbook Energizer, checked 2026-10-29
- Energizer battery cross reference guide Energizer, checked 2026-10-29