Energizer LR43/186 Alkaline Button Cell Batteries (2 Pack)

The Energizer LR43/186 is a 1.5V alkaline button cell battery sold in a 2-pack blister, designed for watches, calculators, medical thermometers, glucose meters, small remote controls and compact LED torches. The LR43 size (also designated as AG12, SR43W equivalent in silver oxide, or 186 in some markets) measures 11.6mm diameter by 4.2mm height, fitting devices that specify this cell size in their battery compartment.

Each cell provides stable 1.5V output from alkaline manganese dioxide chemistry, with a typical capacity of 110-130mAh depending on discharge load. This makes the LR43 suitable for low-drain devices like analogue watches and digital thermometers, where the battery may last 12-24 months, and moderate-drain devices like calculators and small toys, where replacement intervals are shorter. The button form factor allows multiple cells to be stacked in series where higher voltages are needed.

Energizer builds anti-leak protection into the cell construction to reduce the risk of electrolyte leakage damaging sensitive watch movements or medical device circuitry. The cells are mercury-free and shelf-stable for several years when stored at room temperature in the sealed blister pack. Each blister is date-coded with a best-before date, typically 3-5 years from manufacture.

What devices use LR43 batteries?

LR43 cells are used in wristwatches, small calculators, digital thermometers, glucose meters, laser pointers, small remote controls, hearing aid testers, compact LED torches and some children's toys. Check your device's battery compartment or manual for the exact size — LR43 may also be listed as AG12, 186, SR43W or V12GA.

How long do LR43 batteries last?

In a low-drain device like an analogue watch, an LR43 alkaline cell typically lasts 12-24 months. In higher-drain devices like digital thermometers or laser pointers, expect 6-12 months depending on usage frequency. Shelf life in the sealed pack is 3-5 years from the date code printed on the blister.

Can I use silver oxide SR43 batteries instead?

Yes, but the voltage profile differs slightly. Silver oxide SR43W cells provide a more stable 1.55V output and slightly higher capacity, making them preferable for precision watches. Alkaline LR43 cells start at 1.5V and drop more noticeably as they discharge. Both fit the same physical size, so either will work in most devices.

Are these batteries rechargeable?

No. LR43 alkaline cells are single-use and should be disposed of responsibly after discharge. Do not attempt to recharge alkaline button cells — doing so can cause leakage or rupture.