SR57, LR57, 395, 399, SR927W, SR927SW, SR927PW, SR927, SR926, LR927, LR926, SG7, AG7 Battery Equivalents and Replacements
SR57, LR57, 395, 399, SR927SW, AG7, etc. batteries are very popular button/coin cell non-rechargeable batteries, available in alkaline and silver-oxide chemistries and manufactured by practically all battery brands.
These batteries are commonly found in small electronic and electric devices requiring reliable power sources like keychain flashlights, wrist watches, small remote controls, and similar.
Updated: March 30, 2022.
SR927SW/395 Batteries Features and Specifications
Common names/labels of these batteries include SR57, LR57, 395, 399, SR927W, SR927SW, SR927PW, SR927, SR926, LR927, LR926, SG7, and AG7, although the most common ones are 395 and SR927SW - note that labels also depend on the chemistry and the manufacturer.
SR927SW/399 batteries are button/coin cell batteries featuring physical dimensions of (Diameter x Length) 9.5 x 2.6 mm (0.374 x 0.102 inches), and they are manufactured as either alkaline or silver-oxide batteries.
When looking for a replacement battery, note that some manufacturers interchangeably use the same labels for both alkaline and silver-oxide batteries.
For example, the AG7 battery should be an 'Alkaline G7' (AG7) battery, and the SG7 battery should be a 'Silver G7' (SG7) battery.
However, AG7 and SG7 are both often used for silver-oxide batteries, while AG7 is mostly used only for alkaline batteries - for short, manufacturers often label their silver-oxide batteries as 'SG7' and 'AG7 equivalents', despite slight voltage difference between these two chemistries.
Also, some manufacturers use their own labels, for example, Duracell D395/D399 batteries.
- some manufacturers label their low-drain SR57/LR57 batteries as "395 batteries" or "SR927SW" and their "high-drain" SR57/LR57 batteries as "399 batteries" and "SR927W batteries".
On the other hand, some manufacturers label their SR57/LR57 batteries as "395/399 batteries" to emphasize that their batteries are of a "multi-drain" (MD) design.
Most modern silver-oxide SR57/SR927/SR927SW batteries are of the multi-drain design, but there are some manufacturers that offer both "low-drain" and "high-drain" silver-oxide SR57/SR927/SR927SW batteries (again: "low-drain" batteries are labeled as 395/SR927SW batteries and "high-drain" batteries are labeled as 399/SR927W batteries).
- letters in the label behind the number usually describe the intended purpose or describe the electrolyte used in the battery (usually sodium hydroxide or potassium hydroxide). These days manufacturers add enough labels on the packages in order to identify their batteries that there is really no need to check the electrolyte types :)
A button/coin cell 9.5x2.6 mm batteries are mostly offered as silver-oxide batteries, but alkaline batteries are still present on the market as well. The following comparison chart lists some of the most important features and specifications of both chemistries:
|Notes||Voltage drops over time||Very constant voltage|
|Typical Labels||LR57, LR927, AG7, 395, 399||SR57, SR927SW, SR927W, SG7, 395, 399|
|Typical Capacity||40-47 mAh||50-65 mAh|
|Amazon Link||395 Alkaline Battery||395 Silver Oxide Battery|
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Alkaline LR57/395/AG7 batteries: Alkaline button/coin cell batteries are reliable and cheap batteries with a nominal voltage of 1.5 volts. However, as the battery is used, output quickly voltage drops over time.
Actual capacity depends on the cut-off voltage of the used device. If it is some sort of electronic equipment requiring constant and relatively high voltage, then the nominal capacity of these batteries is rather low - such device will require new replacement batteries rather quickly. If alkaline batteries are used in devices that tolerate low battery voltage, then nominal capacity is higher since such devices will operate properly even with the lower voltage.
Typical labels of alkaline batteries are LR##, LR####, AG##, or similar. The typical capacity of, for example, alkaline LR57 is in the 40-47 mAh range, which is lower when compared with equivalent silver-oxide (50-65 mAh).
Shelf life depends on the manufacturer, but generally newer alkaline LR57/SR57/395/AG7 batteries have a storage life of at least 3-5 years.
The cut-off voltage of alkaline batteries is around 1.0 volts.
Silver Oxide SR57/395/399/SR927SW/SR927W batteries: Silver-oxide button/coin cell batteries are the most popular type of these batteries - they cost slightly more than alkaline batteries, but they are not expensive, especially when bought in larger packages.
Also, they often have a storage life of 10 or more years (this depends on the manufacturer), they have a very constant output voltage during operation, which is very similar to the nominal voltage of alkaline batteries (1.55 V vs 1.50 V).
This 0.05 V difference between silver-oxide and alkaline batteries is rarely of an issue even when powering sensitive electronic devices, like for example, wrist watches.
In fact, in real life, more devices will have issues due to the voltage drop in alkaline batteries than with a slightly larger voltage of silver-oxide batteries.
Typical labels of silver-oxide batteries are SR##, SR####, SG##, or similar. Again, some manufacturers also label them using alkaline AG## label to emphasize that their silver-oxide (SG##) batteries are replacements for alkaline AG## batteries.
The typical capacity of, for example, silver-oxide SR57 is in the 50-65 mAh range, which is larger than the equivalent alkaline LR57 capacity (40-47 mAh).
The cut-off voltage of silver-oxide batteries is around 1.2 volts.
The following comparison chart lists some of the most popular 395/SR927SW and 399/SR927W batteries with their most important features and specifications:
|Capacity||Operating Temperature||Annual Self-Discharge Rate||Discharge Current|
|Duracell D395/D399||55 mAh, 22 kΩ down to 1.2V @20°C||0°C to +60°C||<10% @20°C||70.1μA, over 22kΩ @20°C|
|Energizer 395/399||50 mAh, 22 kΩ down to 1V @21°C||-||~2% @20°C||67μA, over 22kΩ @21°C|
|Kodak 395 SR57||42 mAh, 22 kΩ down to 0.9V @21°C||-10°C to +45°C||-||-|
|muRata SR927||60 mAh||-10°C to +60°C||-||-|
|Renata SR927SW 395||55 mAh, 18.2 kΩ down to 0.9V @20°C||-10°C to +60°C||<5% @20°C||86μA, over 18.2kΩ @20°C|
|Renata SR927W 399||53 mAh, 15 kΩ down to 0.9V @20°C||-10°C to +60°C||<10% @20°C||101μA, over 15kΩ @20°C|
As one can see, silver-oxide 9.5x2.6 mm batteries differ in terms of capacity, discharge currents, operating temperatures, etc.
395/SR927SW and 399/SR927W Batteries Frequently Asked Questions (FAQ)
Here are some of the most common Frequently Asked Questions (FAQ) about 395/SR927SW and 399/SR927W batteries:
What size battery is SR927W?
SR927W features physical dimensions of 9.5 x 2.6 mm - diameter is 9.5 mm and the height of the battery is 2.6 mm.
Is SR927W the same as SR927SW?
No, these batteries are not exactly the same. These batteries are silver-oxide 9.5x2.6 mm batteries, but the SR927W (399) battery is a high-drain battery suitable for digital watches with LEDs and alarms, while the SR927SW (395) battery is a low-drain battery suitable for low, constant current discharge applications.
Modern 9.5x2.6 mm batteries are designed as multi-drain batteries, with some brands still offering both low-drain and high-drain models.
What is the equivalent of a 927 watch battery?
927 watch batteries are mostly silver-oxide 9.5x2.6 mm batteries (1.55V) although it may also be a lithium CR927 3V battery.
What is the difference between SR927 and CR927 batteries?
SR927 and CR927 batteries feature very similar dimensions:
- SR927 battery: 9.5 x 2.6 mm,
- CR927 battery: 9.5 x 2.7 mm.
But, the SR927 battery is a silver-oxide battery with a nominal voltage of 1.55V and capacity in the 50-55mAh range, while CR927 is a Lithium Manganese Dioxide battery with a nominal voltage of 3.0V and a capacity in the 30-35 mAh range.
As such, SR927 and CR927 batteries are NOT interchangeable.
What is a 395 battery equivalent?
Any low-drain or multi-drain silver-oxide 9.5x2.6 mm battery is a battery replacement for 395 battery - the most common replacement battery label is SR927SW battery.
However, high drain 399/SR927W batteries can be used instead of 395 batteries, just be aware that high-drain batteries feature a higher self-discharge rate than low-drain batteries.
Long Story Short: if you are looking for an SR57, LR57, 395, 399, SR927W, SR927SW, SR927PW, SR927, SR926, LR927, LR926, SG7, AG7 battery replacement for a wrist watch or some similar electronic device, go for silver-oxide SR57/SR927SW/SR927W/395/399 battery from a reputable brand.
If you are looking for a similar battery replacement for an electric device or even a small toy, an alkaline LR57/LR927/AG7 battery from a reputable brand will do the job.
Call us biased, but we generally favor silver-oxide over alkaline batteries in units that support the use of both chemistries.
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