LR416, SR416, SR416SW, SR416S, 337 Battery Equivalents, and Replacements
LR416, SR416, SR416SW, SR416S, and 337 batteries are very small button/coin cell batteries used in watches, wrist watches, and similar very small electric and electronic devices that require an ultra-small but reliable power source.
SR416SW/337 batteries feature stable output voltage, relatively low self-discharge rate, and good capacity considering the size and are much more common than LR416 batteries.
Published: March 16, 2023. 
SR416SW/337 Battery Features and Specifications
LR416, SR416, SR416SW, SR416S, 337, etc. batteries are button/coin cell batteries featuring physical dimensions of (D x H) 4.8 x 1.6 mm (~0.1889 x 0.0629 inches).
Although alkaline button/coin cell batteries of very small dimensions are also in use, most manufacturers don't manufacture alkaline 4.8 x 1.6 mm batteries (LR416 battery) since these batteries are almost exclusively used in small watches and similar devices that require stable output voltage, provided by the silver-oxide battery chemistry.
The most common labels of the silver oxide 4.8 x 1.6 mm coin cell batteries are SR416SW or 337 battery, but other labels are in use, too, SR416S, SR416, and similar.
The nominal voltage of the SR416SW/337 battery is 1.55 volts, the cutoff voltage is 1.2 volts, the nominal capacity is 8-9 mAh, the shelf life is 3-5 years, and the operating temperature is usually in the -10°C to +60°C range.
Actual capacity depends on the drain current, battery age, and drain temperature - for example, most SR416SW/337 batteries are low-drain batteries with the actual capacity tested by draining the batteries down to 1.2 volts over 56-68 kΩ resistor at room temperatures.
SR416SW/337 Batteries Comparison Chart
The following comparison chart lists some of the most popular SR416SW/337 batteries with their most important features and specifications:
| Battery Datasheet |
Capacity | Operating Temperature | Annual Self-Discharge Rate | Discharge Current |
| Energizer 337 | 8.3 mAh, 100kΩ down to 1.2V @21°C | - | <2.5% @20°C | 16μA @1.55V 100kΩ @21°C |
| Maxell SR416SW | 8.0 mAh @10μA down to 1.2V @20°C | -10°C to +60°C | - | 10μA stand. cont. |
| Renata SR416SW | 8 mAh, 56.2kΩ down to 1.2V @23±3°C | -10°C to +60°C | <7% @23±3°C | 27.8μA @1.55V 56.2kΩ @23±3°C |
| Seiko SR416SW | 7.5 mAh, 100kΩ down to 1.2V @23°C | -10°C to +60°C | - | 10μA stand. cont. |
As one can see, these batteries are evenly matched in terms of capacity, discharge current and operating temperature, but they tend to differ in annual self-discharge rate, although such information is incomplete for some models.
SR416SW Battery vs MT416F Battery
Both SR416SW and MT416F are used for powering small watches and similar electronic devices.
However, SR416SW is a battery, and the MT416F is a capacitor (not a battery).
As a capacitor, MT416F doesn't use chemical reactions to store energy - thus, it can last up to 10 years, with stories about these devices lasting even longer.
Issues with SR416SW and MT416F:
- they both have "416" as part of their labels,
- they are both used for small watches.
So, if You are looking for an MT416F, You are looking for an "MT416F capacitor," and if You are looking for an SR416SW, you are looking for an "SR416SW battery".
SR416SW/337 Battery Safety Issues
SR416SW/337 battery is a shiny and small object that can attract kids and pets and swallow them easily.
Although modern coin cell batteries don't contain lead, mercury, cadmium, and similar toxic elements, if the battery gets swallowed, body fluids short-circuit the battery, causing electrolysis of body fluids.
New compounds can cause chemical burns that can be very dangerous, even lethal.
Although SR416SW/337 battery features relatively low voltage and low capacity, if they get swallowed, contact the emergency center (or vet) immediately and explain to them what happened and act according to their instructions.
Long Story Short: If You are looking for a 4.8 x 1.6 mm battery, go for a silver-oxide SR416SW/337 battery from reputable brands that have been used and tested by countless users in real-life situations.
However, if You have a small, delicate watch and You need to replace its battery, perhaps the best solution is to take the watch to the watchmaker and let them check the watch and replace the battery ...
Just my 2c :)
