Wrist Watch Battery Replacement Chart - Watch Battery Repair

Wrist watches are commonly powered using one or rarely two button/coin cell batteries, and these batteries have a limited operating lifetime. When replacing an old battery with the new one, the best practice is to use batteries recommended by the watch manufacturers.

However, finding the exact type and model can be sometimes confusing due to the different labels some battery brands are using for their batteries. Also, using silver-oxide instead of alkaline batteries can prolong the watch operating time on a single battery.

Instead of silver-oxide/alkaline coin cell batteries, some watches use lithium non-rechargeable batteries, and even some of them support the use of rechargeable button/coin lithium cell batteries.

On This Page:

- Silver-Oxide/Alkaline Button/Coin Cell Batteries - "SR-SW" Watch Batteries

- Lithium Button/Coin Cell Batteries - "CR" Watch Batteries

- Cobalt Titanium Lithium Button/Coin Cell Batteries - "CTL" Watch Batteries

- Lithium Titanium Button/Coin Cell Batteries - "MT" Watch Batteries

- Replacing a Watch Battery  


Silver-Oxide/Alkaline Button/Coin Cell Batteries

376 377 sr626sw battery mButton/coin cell batteries are a group of non-rechargeable batteries often used in wrist watches.

There are several chemistry types of these batteries - the most common are alkaline and silver-oxide batteries.

These batteries also come as zinc-air batteries, which are used mostly as hearing aid batteries, and due to the rather limited operating lifetime, they are not used in watches.

Mercury-oxide batteries were very common wrist watch batteries, but they are not used anymore due to their mercury content.

A comparison of these chemistries is given in the following table:

Chemistry Alkaline Silver-Oxide Zinc Air Mercury-Oxide
Voltage 1.5V 1.55V 1.4 - 1.45V 1.35V
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 LR##, LR####, AG## SR##, SR##SW, SR####SW, SG## PR##, P###, Z### MR##, MR####
Typical LR626/SR626SW Capacity 15 - 17 mAh 25-27 mAh - -

Alkaline: Alkaline button/coin cell batteries are reliable and cheap batteries. Their nominal voltage is 1.5 volts, but as the battery is used, their voltage quickly drops.

The actual capacity depends on the cut-off voltage of the used watch. Wrist watches often require constant and relatively high voltage, making the nominal capacity of these batteries rather low - such a device will require new replacement batteries rather quickly. If alkaline batteries are used in devices that tolerate low battery voltage, then nominal capacity is larger, since such a device will not require new batteries soon.

Shelf life depends on the manufacturer, but generally newer alkaline batteries have a shelf life of at least 3-5 years.

Silver Oxide: Silver-oxide button/coin cell batteries are the most popular type of wrist watch batteries - they are not expensive, often have a shelf life of 10 or more years, they have very constant voltage during operation, which is very similar to the nominal voltage of alkaline batteries (1.55 V vs 1.50 V).

The typical capacity of, for example, silver-oxide SR626SW is in the 25-27 mAh range, which is larger than the equivalent alkaline LR626 capacity (15-17 mAh).

Here is a cross-reference chart of common button/coin cell wrist watch batteries:

Diameter Height Silver Oxide
Alkaline Amazon Search
4.8 mm 1.6 mm

SR416, SR416SW, SR416S, 337

LR416 SR416SW Battery
5.8 mm 1.6 mm

SR516, SR516SW, SR62, 317

LR516, LR62 317 Battery
5.8 mm 2.1 mm

SR521, SR521S, SR521SW, SR63, 379, SG0, AG0

LR521, LR63, AG0 SR521SW Battery
5.8 mm 2.7 mm

SR527, SR527S, SR527SW, SR64, 319

LR527, LR64 319 Battery
6.8 mm 1.65 mm

SR616, SR616W, SR616SW, 321, V321

- SR616SW Battery
6.8 mm 2.1 mm

SR621, SR621SW, SR60, 164, 364, SG1, AG1

LR621, LR60, AG1 SR621SW Battery
6.8 mm 2.6 mm

SR626, SR626SW, SR66, 177, 376, 377, SG4, AG4

LR626, LR66, AG4 SR626SW Battery
7.9 mm 1.3 mm

SR712, SR712S, SR712SW, 346

- 346 Battery
7.9 mm 1.65 mm

SR716, SR716SW, SR67, 315

- 315 Battery
7.9 mm 2.1 mm

SR721, SR721W, SR721SW, SR721PW, SR58, 162, 361, 362, SG11, AG11

LR721, LR58, AG11 SR721SW Battery
7.9 mm 2.6 mm

SR726, SR726W, SR726SW, SR726PW, SR59, 196, 396, 397, SG2, AG2

LR59, LR726, AG2 396 Battery
7.9 mm 3.1 mm

SR731, SR731SW, 24, 329

LR731 329 Battery
7.9 mm 3.6 mm

SR41, SR736, SR736PW, SR736SW, SG3, AG3, 192, 384, 392

LR41, LR736, AG3 384 Battery
7.9 mm 5.4 mm

SR754, SR754W, SR754SW, SR754PW, SR48, 193, 309, 393, SG5, AG5

LR754, LR48, L750, AG5 393 Battery
9.5 mm 1.6 mm

SR916SW, SR68, 373, SR916

LR916 SR916SW Battery
9.5 mm 2.1 mm

SR920W, SR920SW, SR920PW, SR920, SR921, SR69, 171, 370, 371, SG6, AG6

LR920, LR921, AG6 SR920SW Battery
9.5 mm 2.6 mm

SR927W, SR927SW, SR927PW, SR927, SR926, SR57, 395, 399, SG7, AG7

LR57, LR927, LR926, AG7 395 Battery
9.5 mm 3.6 mm

SR936, SR936SW, SR45, 194, 394, SG9, AG9

LR45, LR936, AG9 394 Battery
11.6 mm 1.65 mm

SR1116, SR1116W, SR1116SW, SR1116PW, 365, 366, S16, 608

- 365 Battery
11.6 mm 2.1 mm

SR1120W, SR1120SW, SR1120PW, SR1121, SR55, 191, 381, 391, SG8, AG8

LR1120, LR1121, LR55, V8GA, AG8 381 Battery
11.6 mm 3.1 mm

SR1130W, SR1130SW, SR1130PW, SR1131, SR54, 189, 387, 389, 390, AG10

LR1130, LR1131, LR54, V10GA, AG10 389 Battery
11.6 mm 3.6 mm

SR1116, SR1116S, SR1116SW, SR1116PW, 366

- 366 Battery
11.6 mm 4.2 mm

SR43W, SR43, SR43SW, 386, 301, AG12, SR1142, SR1142SW

LR43, AG12, LR1142 386 Battery
11.6 mm 5.4 mm

SR44W, SR44, SR44SW, 157, 357, 303, SG13, AG13, S76, A76, SR1154

LR44, 76A, AG13, LR1154, A76 357 Battery

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The most common silver-oxide wrist watch batteries are SR626SW (SW - Silver, Watch) battery, but other batteries are used as well, like SR920SW, SR616SW, SR916SW, SR621, SR416SW, SR521SW, SR721SW, etc.

SR626SW Watch Battery

sr626sw w200pxSR626SW watch battery is a coin-cell silver-oxide battery featuring physical dimensions of (D x H) 6.8 x 2.6 mm. Its nominal voltage is 1.55 volts, a nominal capacity is 25-27 mAh and the cutoff voltage is ~1.2 volts.

Like all watch batteries, the actual capacity and runtime of the SR626SW battery depend on the constant current drain, average temperature, maximum and minimum temperature, the cutoff voltage of the device being powered by this battery, battery age, etc.

When compared with LR626 battery, an alkaline 6.8 x 2.6 mm coin-cell battery, SR626SW features more stable voltage, larger capacity (25-27 vs 15-17 mAh), higher cutoff voltage (1.2 vs 1.0 volts), longer shelf life (5-7+ years vs 3-5 years), etc.

SR626SW battery also comes with other labels as well, including 177, 376, 377, AG4, SG4, SR66, SR626, etc. while LR626 battery is also labeled as 177, 376, 377, AG4, etc.

As one can see, both silver-oxide and alkaline 6.8 x 2.6 mm batteries share some of the labels - if You want a silver-oxide battery for your watch (and you should go for a silver-oxide battery), the package of the battery must clearly state that the battery is silver-oxide battery.

So, when buying a new SR626SW battery, be sure to go for the battery (or batteries) from a reputable brand, that has been tested by many users in countless real-life applications.


Lithium Button/Coin Cell Batteries

cr2032 battery mLithium button/coin cells are mostly primary (non-rechargeable) 3V batteries. Their negative electrode is lithium, while the positive electrode is either manganese-dioxide or carbon-monofluoride.

Manganese-dioxide lithium batteries' labels start with 'C' and generally their operating temperature range is between -20°C (-4°F) and 70°C (158°F). The nominal voltage is 3.0 V, and a cutoff voltage is 2.0 V. Typical example is the CR2032 battery, with a typical capacity of ~225 mAh

Carbon-monofluoride lithium batteries' labels start with 'B' and generally their operating temperature range is -30°C (-22°F) and 85°C (185°F). The nominal voltage is 2.8 V, and a cutoff voltage is 2.25 V. Typical example is the BR2032 battery, with a typical capacity of ~190 mAh.

Generally, BR#### and CR#### are interchangeable batteries - slight lower voltage of BR#### batteries is no problem, at least not for most common devices. But, for devices operating in extreme temperatures, BR#### batteries are recommended over CR#### batteries.

The nominal capacity of rechargeable lithium button/coin cell batteries is lower than non-rechargeable CR or BR batteries, but they can be charged and discharged many times (up to or even more than 1000 times). Their most common label is LiR#### and nominal voltage is 3.6 or 3.7 volts, however, there are also rechargeable 3.0 volts VL series (Vanadium Lithium rechargeable battery), 3.0 volts ML series (Manganese Lithium rechargeable battery), etc.

For example, LiR2032 (or LIR2032, ML2032, etc.) capacity is in the 50-80 mAh range, while the typical capacity of CR2032 battery is ~225 mAh.

Replacing CR or BR types of batteries with LiR batteries should be done only if the device operates properly when being powered with 3.6V (instead of 2.8 or 3.0V). This 0.6V difference can cause operating issues and it can even damage certain devices.

On the other hand, 1000+ charging/discharging cycles can save plenty of money.

Personally, if you have a watch that uses lithium batteries, go for a good CR#### battery since it has a much higher capacity. Also, BR#### are a good choice if you need your watch to operate in extreme temperature conditions.

Here is a cross-reference chart of common lithium 3V coin cell batteries:

Diameter Height Equivalents/Replacements Amazon Search
9.5 mm 2.7 mm CR927, DL927 CR927 Battery
10.0 mm 2.5 mm CR1025, DL1025, 5033LC CR1025 Battery
11.5 mm 3.0 mm CR1130, DL1130, BR1130, KL1130, L1130 CR1130 Battery
12.5 mm 1.6 mm CR1216, DL1216, 5034LC CR1216 Battery
12.5 mm 2.0 mm CR1220, DL1220, SB-T13, 5012LC CR1220 Battery
12.5 mm 2.5 mm CR1225, DL1225, 5020LC CR1225 Battery
16.0 mm 1.6 mm CR1616, DL1616 CR1616 Battery
16.0 mm 2.0 mm CR1620, DL1620, 5009LC CR1620 Battery
16.0 mm 2.5 mm CR1625 CR1625 Battery
16.0 mm 3.2 mm CR1632, DL1632 CR1632 Battery
20.0 mm 1.2 mm CR2012, SB-T15 CR2012 Battery
20.0 mm 1.6 mm CR2016, DL2016, E-CR2016, SB-T11, 5000LC CR2016 Battery
20.0 mm 2.0 mm CR2020 CR2020 Battery
20.0 mm 2.5 mm CR2025, DL2025, BR2025, LiR2025, E-CR2025, SB-T14, 5003LC CR2025 Battery
20.0 mm 3.2 mm CR2032, DL2032, ECR2032, BR2032, E-CR2032, SB-T51, 5004LC, LiR2032 CR2032 Battery
20.0 mm 4.0 mm CR2040 CR2040 Battery
23.0 mm 2.0 mm CR2320 CR2320 Battery
23.0 mm 2.5 mm CR2325 CR2325 Battery
23.0 mm 3.0 mm CR2330, BR2330 CR2330 Battery
23.0 mm 3.5 mm CR2335, BR2335 CR2335 Battery
23.0 mm 5.4 mm CR2354 CR2354 Battery
24.5 mm 1.2 mm CR2412 CR2412 Battery
24.5 mm 3.0 mm CR2430 CR2430 Battery
24.5 mm 5.0 mm CR2450 CR2450 Battery
24.5 mm 7.7 mm CR2477 CR2477 Battery
30 mm 3.2 mm CR3032, BR3032 CR3032 Battery

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The most common lithium coin cell wrist watch battery is the CR1216 battery, but other batteries are used as well, like CR2016, CR2032, CR2025, CR2430, CR1220, CR1620, CR1616, etc.

These batteries are commonly used in many small devices, gadgets, and appliances, and getting a new one should not be a problem.

CR1216 Watch Battery

cr1216 w150pxCR1216 watch battery is a non-rechargeable manganese lithium battery featuring physical dimensions of (D x H) 12.5 x 1.6 mm and a nominal voltage of 3.0 volts and a typical capacity of ~25 mAh.

Again, actual capacity depends on the application, watch use, temperature and similar - if You have a wrist watch with an alarm, LED lights, and similar, the use of such features can significantly shorten the runtime of the battery.

CR1216 can be replaced with a BR1216 battery (carbon-monofluoride lithium battery) which features a slightly lower, but more stable voltage, and lower discharge current - hence, the BR1216 battery should NOT be used with watches that feature an alarm, LED lights, and similar features.

LiR1216 are very rare batteries, but they also feature nominal voltage in the 3.6-3.7 volts range and it is questionable which 3.0 volts devices support the use of 3.6-3.7 batteries.

If You need a rechargeable 3.0 volts 1216 battery, the ML1216 battery is a much better choice. However, that battery is usually manufactured with tabs and is also rather rare.

In the end, if You need a round ('R') 12.5 x 1.6 mm 3.0 lithium battery, go for a CR1216 battery (non-rechargeable lithium-manganese battery) from reputable brands and replace them when required.


Cobalt Titanium Lithium Button/Coin Cell Batteries - "CTL" Watch Batteries

panasonic ctl920f w200pxCobalt Titanium Lithium button/coin cell batteries, for short "CTL" batteries, are rechargeable type of watch batteries that are also often labeled as 'capacitors' or 'accumulators' and are used to power wrist watches with some sort of recharging system, including automatic watches, solar watches and similar.

Note: when first automatic/solar watches appeared on the market a long time ago, they actually had little capacitors and not the batteries to store the charge - hence, rechargeable watch batteries are still sometimes referred to as 'capacitors' and not batteries.

But, CTL watch batteries are true rechargeable batteries.

The most popular CTL batteries are CTL920, CTL1616, and CTL621 batteries, while CTL1025 and a few other batteries are not being used very often.

CTL batteries feature a nominal voltage of 2.3 volts, a charging voltage of 2.5-2.7 volts (using constant voltage charging system), and a cutoff voltage of approximately 2.0 volts.

Note: rechargeable CR batteries (this is sort of the wrong statement, since CR batteries are not rechargeable batteries at all, but in order to simplify few things, we use the term 'rechargeable CR batteries') are often labeled as LiR or ML batteries (for example, rechargeable CR2032 is actually LiR2032 or ML2032 battery) and they feature a nominal voltage of 3.0 volts (ML batteries) or 3.6 - 3.7 volts (LiR batteries). Never use ML or LiR battery instead of CTL battery and vice-versa! ML and LiR rechargeable batteries are not commonly used in wrist watches - they are mostly used as memory backup batteries, in communication devices, PCs, medical devices, etc.

The nominal capacity depends on the battery size/volume, continuous drain current, temperature of use, number of charging/discharging cycles, depth of discharge, and similar.

Note: we use Panasonic CTL batteries as examples because they are often a default choice of many solar watch manufacturers, they perform well and can be easily found at various online shops. Also, Panasonic CTL920F battery (or sometimes CTL920A) is a 'CTL920' battery.

CTL batteries can come with or without tabs. Obviously, those without tabs are easier to replace at home, however, if You are not sure what needs to be done and how, do yourself a favor and take the watch to the watch repair shop and let them replace the battery for You.

The following cross-reference chart lists the most popular CTL batteries and their most important features and specifications:

Battery CTL621 CTL920 CTL1616
Max. Dimensions (D x H) 6.8 x 2.1 mm 9.5 x 2.0 mm 16.0 x 1.7 mm
Nominal Voltage  2.3 volts 2.3 volts 2.3 volts 
Charging Voltage 2.5 - 2.7 volts  2.5 - 2.7 volts 2.5 - 2.7 volts 
Continuous Drain Current 0.02 mA 0.05 mA 0.1 mA
Nominal Capacity  3.6 mAh 7.7 mAh 13.0 mAh
Datasheet (PDF) CTL621F CTL920F CTL1616F
Amazon Link CTL621 Battery CTL920 Battery CTL1616 Battery

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Lithium Titanium Button/Coin Cell Batteries - "MT" Watch Batteries

Lithium Titanium button/coin cell batteries, also known as "MT" batteries, are another type of rechargeable watch batteries.

MT batteries are very similar to CTL and LiR batteries, with the most important difference being a nominal voltage of 1.5 volts (2.3 volts for CTL batteries, and 3.6 volts for LiR/ML batteries).

The most popular MT batteries are MT621, MT920, and MT516 battery, with MT416, MT821, and a few other batteries are not being used very often.

MT batteries feature a nominal voltage of 1.5 volts, a cutoff voltage of approximately 1.2 volts, while capacity depends on the battery size, drain conditions, number of charging/discharging cycles, and similar.

When compared with CTL batteries, MT batteries feature lower capacity and voltage, but can provide relatively stronger currents and can endure a larger number of charging/discharging cycles.

The following cross-reference chart lists the most popular MT batteries and their most important features and specifications:

Battery MT516 MT621 MT920
Max. Dimensions (D x H) 5.8 x 1.6 mm 6.8 x 2.1 mm 9.5 x 2.0 mm
Nominal Voltage 1.5 volts 1.5 volts 1.5 volts
Continuous Drain Current 0.025 mA 0.05 mA 0.05 mA
Nominal Capacity 1.8 mAh 2.5 mAh 5.0 mAh
Datasheet (PDF) MT516F MT621 MT920
Amazon Link MT516 Battery MT621 Battery MT920 Battery

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Replacing a Watch Battery

First of all, when replacing a watch battery, if You are not sure how to do it, don't do it - take your watch to the repair shop and let them check the watch and replace the battery. After all, if the watch has stopped working, maybe it is not a battery issue ...

A new watch battery should be chosen according to the watch manufacturer's recommendations. If your old battery was an alkaline battery and your watch supports the use of silver-oxide batteries, go for silver-oxide battery. Alkaline batteries are somewhat cheaper, but the end price difference is almost negligible.

Find the watch Owner's Guide (manual, instructions), check the required battery size, model, type, chemistry and find out how to replace the battery - some manufacturers provide detailed written instructions, some provide YouTube videos, and some even insist that the watch MUST be taken to the licensed watch repair shop.

If the watch is still within the warranty period, do NOT open it at home - either take it to the repair shop or send it to the manufacturer for the battery replacement.

When replacing the watch battery at home, it is good to have proper tools. Some watches can be opened and have their battery replaced even with a toothpick, and some watches require specialized watch repair kits, that can be ordered online.

Now, when You have your watch, its new battery, Owner's Guide, proper tools, battery replacement is relatively easy - just follow the instructions provided by the manufacturer.

Also, some watches require their seal to be replaced when the battery is being replaced - this is very important for divers' and similar watches.

Cleaning and lubrication of the watches - do NOT try to clean or lubricate your watch when replacing the battery. Actually, when replacing the battery, do it in the clean room and do it quickly, preventing the fine dust particles to enter the sensitive watch mechanism.

Also, just a drop of lubricant can cause so much resistance, that it is able to destroy the watch - watch mechanism and electronics are that sensitive to foreign objects and liquids.

Again, if you are unsure about your watch, go to the nearest watch shop and let the professionals replace the battery - better safe than sorry :)