LR43, SR43, LR1142, SR1142, AG12, 386, 301 Battery Equivalents, and Replacements
LR43, SR43, LR1142, SR1142, AG12, 386, 301 batteries are button/coin cell batteries often found in calculators, watches, toys, small flashlights, remote controls, and other small electronic devices.
According to the IEC standard, these batteries should be labeled LR1142 (alkaline) or SR1142 (silver-oxide).
In many instances shorter, two-digit code is used: LR43 for alkaline and SR43 for silver-oxide batteries, but there are other labels as well, like AG12, SG12, 386, 301, etc.
LR43, SR43, LR1142, SR1142, AG12, 386, 301 batteries feature 11.6 mm (0.4567 inches) diameter and 4.2 mm (0.1654 inches) height.
These 11.6x4.2 mm batteries are/were available in several chemistries, each having its own labels. Also, some manufacturers use their own versions of standard labels, leading to even greater confusion.
Labels, chemistries and comparison of LR43/SR43/AG12/SG12 batteries are given in the following chart:
LR43, SR43, AG12, SG12, 386 Batteries Comparison Chart
|Notes||Voltage drops over time||Very constant voltage||Slightly lower voltage, large capacity;
mostly used as hearing aid batteries
|Slightly lower voltage, contains mercury;
not in use anymore
|Typical Labels||LR43, AG12, LR1142, 386, 301, 186||SR43W, SR43, SR43SW, 386, 301, 186, AG12, SG12, SR1142, SR1142SW||AC41E, PR43, 7001Z||MR43, MR1142|
|Typical Capacity||100 mAh||130 mAh||380-390 mAh||100 - 120 mAh|
|Amazon Link||LR43 Battery||SR43 Battery||No longer in use||No longer in use|
Note: Amazon affiliate links open in the new windows, feel free to check them for the latest offers and most up-to-date prices.
Alkaline 11.6x4.2 mm Batteries - LR43, AG12, LR1142, 386, 301, 186 Batteries
Alkaline 11.6x4.2 mm batteries are commonly labeled as LR43, AG12, LR1142, 386, 301, 186 batteries, although some labels are even used interchangeably, for example, some manufacturers use AG12, 386, 301, and 186 labels to label silver-oxide 11.6x4.2 mm batteries, too.
AG12 should be 'Alkaline G12' battery and 'SG12' should be 'silver G12' battery, but ...
Anyway, LR43/LR1142 batteries feature a nominal voltage of 1.5 volts, a cutoff voltage of 1.0 volts, and feature a typical capacity of ~100 mAh. Note that capacity often depends on the cutoff voltage and drain current of powered devices.
LR32/LR1142 are cheap and reliable power sources for toys, flashlights, and electronic devices that tolerate voltage drop over time.
Silver-Oxide 11.6x4.2 mm Batteries - SR43W, SR43, SR43SW, 386, 301, 186, AG12, SG12, SR1142, SR1142SW Batteries
Silver-oxide 11.6x4.2 mm batteries are labeled as SR43W, SR43, SR43SW, 386, 301, 186, AG12, SG12, SR1142, SR1142SW batteries, but most commonly SR43, SR1142, and SR43S(W).
If there are numerical labels 186, 301, and 386, check the description of the battery and verify its chemistry.
SR43/SR1142 batteries feature a nominal voltage of 1.55 volts, a cutoff voltage of 1.2 volts, and a typical capacity of 130 mAh.
Some manufacturers offer both 'high-drain' and 'low-drain' versions of these batteries and label them differently. For example:
- Renata SR1142W is a high-drain SR43 battery, featuring 130 mAh capacity when being discharged over 6.81 kΩ (224.6 μA) at 20°C, down to 1.2 volts. Renata SR1142W datasheet is available as PDF file.
- Renata SR1142SW is a low-drain SR43 battery, featuring 130 mAh capacity when being discharged over 8.25 kΩ (184.2 μA) at 20°C down to 1.2 volts, discharged over 6.81 k (224.6 A) at 20°C, down to 1.2 volts. Renata SR1142SW datasheet is available as PDF file.
This 40.4 A difference doesn't sound much, but these batteries are often used to power sensitive and delicate electronic equipment where every detail counts.
Note: Low drain batteries often have a lower self-discharge rate ...
When compared with alkaline batteries, silver-oxide batteries feature slightly higher voltage, but more importantly more stable voltage, higher capacity, longer shelf life, but also they tend to cost slightly more.
Zinc Air and Mercury-Oxide 11.6x4.2 mm Batteries
Zinc-air 11.6x4.2 mm batteries are no longer in use - they were labeled as AC41E, PR43, or 7001Z and were used as hearing aid batteries.
AC41E, PR43, or 7001Z featured a typical capacity of 380-390 mAh, but are phased out in the favor of Blue Tab PR44 (675, ZA675, 7003ZD) batteries featuring on average 600 mAh capacity.
For more about these batteries, feel free to check our Non-Rechargeable vs. Rechargeable Hearing Aid Batteries: Size 10, 312, 13, 675 Hearing Aid Batteries article.
Mercury-oxide 11.6x4.2 mm batteries are no longer in use due to the mercury content.
They featured a slightly lower nominal voltage of 1.35 volts and capacity between alkaline and silver-oxide batteries.
They were labeled as MR43 or MR1142 batteries.
Long Story Short: If you are looking for LR43, SR43, LR1142, SR1142, AG12, 386, 301 battery replacement for your watch or some similar sensitive electronic device, go for silver-oxide SR43, SR43S, SR43W, SR43SW, SG12 battery, or for AG12, 186, 301, 386 battery labeled as 'silver-oxide' battery.
If you are looking for LR43, SR43, LR1142, SR1142, AG12, 386, 301 battery replacement for a toy or some non-sensitive electronic devices, then go for alkaline LR43, LR1142, AG12 battery or for AG12, 186, 301, 386 battery labeled as 'alkaline' battery.
Personally, the price difference between alkaline and silver-oxide LR43/SR43 batteries is very small, and if you need just a few of these batteries, go for silver-oxide SR43, SR43S, SR43SW batteries from reputable brands.