Our readers keep the lights on and the charging cables organized. As an Amazon Associate, I earn from qualifying purchases.
Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
This guide ranks the best batteries for watches by the specs that keep your watch accurate—voltage, capacity, and count—plus what thousands of owners actually report, so you can buy once and stop worrying for years.
I’m Mo Maruf — the founder and writer behind The Tools Trunk. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
You’ll find the most reliable silver oxide power sources for your timepiece here, ranked by performance and value. batteries for watches come in many sizes, so each pick is matched to the specific model it fits best.
Our Picks at a Glance
How To Choose The Best Batteries For Watches
Picking a watch battery depends on three things: matching the exact size code, choosing the right chemistry, and deciding how many spares you actually need. Get those right and the rest is easy.
Size Codes Are Everything
Your old battery has a code printed on it—like 377, 371, or 399—and that code tells you the physical size and the replacement you need. A 377 (also called SR626SW) is 6.8mm wide, while a 371 (SR920SW) is wider at 9.5mm. Swapping one for another won’t work because they won’t fit the watch case, so always match the exact designation.
Chemistry: Stick With Silver Oxide
Silver oxide cells deliver a steady 1.55 volts until nearly dead, keeping quartz watch hands accurate. Cheaper alkaline cells drop voltage as they drain, making watches run slow or stop early. For a timepiece, silver oxide is worth the small premium.
Count vs. Shelf Life
A single watch might need one battery every couple of years, so a 6-pack or 20-pack can feel like overkill. But if you own several watches, use digital thermometers, or have key fobs, bulk buying keeps spares on hand and cuts the per-battery cost dramatically. Just check the storage life—most quality silver oxide cells hold power for years on a shelf, so a multi-pack rarely goes to waste.
Quick Comparison
| Model | Best For | Size Code | Voltage | Pack Count | Amazon |
|---|---|---|---|---|---|
| Duracell 377★ Best Overall | Trusted brand daily wear | 377 (SR626SW) | 1.55V | 6 | Amazon |
| Murata 373Premium Pick | Japanese quality in bulk | 373 (SR916SW) | 1.55V | 10 | Amazon |
| Renata 377 20ct | Long-term stocking up | 377 (SR626SW) | 1.55V | 20 | Amazon |
| Maxell 399 | Leak-resistant precision | 399 (SR927W) | 1.55V | 5 | Amazon |
| Renata #371 | High-capacity wider cells | 371 | — | 20 | Amazon |
| Duracell 377 12ct | Double the spares | 377 | 1.5V | 12 | Amazon |
| FOZAOAXE SR920SW | Budget bulk backup | SR920SW (371) | 1.55V | 80 | Amazon |
In‑Depth Reviews
1. Duracell Watch Battery 377, 6 Pack
Our pick — over 4.5★ from 750+ verified ratings; the strongest balance of quality and price.
The household name that makes swapping a 377 cell feel completely unremarkable.
You buy the Duracell 377 when you want a name you trust and a battery that fits without fuss. It’s a single-use silver oxide cell rated at 1.55 volts, and the 6-pack gives you spares for the digital thermometers, laser pointers, and stopwatches that share the same size. Buyers report the cells arrive fully charged and fit standard 377 watch models cleanly.
Reliability is what wins people over here — it’s the trait owners praise most, and it shows in how watches keep accurate time until the cell finally gives out. The practical verdict on lifespan is a mixed one: some owners say these last as long as any brand they’ve tried, while others report a cell dying after about 6 months of use. That’s the honest trade-off for buying a famous name at a reasonable price, as buyers put it: “Batteries arrived fully charged, fit watch, last as long as others, slightly cheaper than major brands.”
The one gap in the data: some packs lack an expiration date on the carton, so you can’t always verify how long they’ve sat on a shelf. If you tend to buy batteries only when a watch dies, this is a non-issue; if you’re stocking a drawer for years, it’s worth noting.
What wins people over
- Trusted Duracell brand with reliable, steady 1.55V output
- 6-pack covers watches plus other 377 devices
- Owners praise the perfect fit and easy install
The honest trade-offs
- Battery life reviews are mixed — some cells die after ~6 months
- No expiration date on some packaging
Reach for this if: you want a recognizable brand with a solid 6-pack for everyday watches and small gadgets.
Look elsewhere if: you need a huge bulk count or a larger-size cell for a wider watch model.
2. Murata 373 Battery SR916SW (10 Batteries)
Japanese engineering in a 30mAh cell that owners say runs strong for years.
If you want a premium brand without per-cell premium pricing, the Murata 373 (SR916SW) delivers. It puts Japanese micro-battery quality into a 30 milliamp-hour silver oxide package at 1.55 volts, and the 10-pack steps up from the 6-pack Duracell above for practical bulk. Owners note the cells arrive fresh, often measuring about 0.5V over the rating, signaling good turnover and healthy stock.
Quality is the trait that stands out most in owner feedback, and value for money runs a close second. The bulk format is the real draw here: as owners put it, “Great that you can buy these in bulk. My watch dies every 2 years” — meaning a 10-pack effectively buys you two decades of low-maintenance timekeeping for a single watch. The seller ships independently, which some buyers flag as a minor tracking inconvenience, but the battery quality itself earns consistent praise.
This is the pick for anyone who owns a watch that takes the 373 size and wants a premium brand without paying premium per-cell prices. The 30mAh capacity is modest by design — it’s sized for the slim profile of an SR916SW watch — so don’t expect the runtime of a larger cell like the 40mAh FOZAOAXE SR920SW.
Our read: A premium Japanese brand at a bulk-friendly price, with fresh stock and strong owner confidence in quality.
Choose this for: reliability-first buyers who want Japanese quality and enough cells to last a decade-plus.
Think twice if: you need the larger 371/399 size or prefer a household-name brand like Duracell.
3. Renata 377 SR626SW Batteries (20 Count)
Twenty Swiss-made cells that turn battery anxiety into a non-issue for years.
Renata is a Swiss battery maker known for consistently great performance, and this 377 (SR626SW) pack brings that quality in the biggest count of the three 377 options here. It’s rated at 1.55 volts with a 24 milliamp-hour capacity, and the 20-cell count is the headline reason to pick it — that’s double the Murata 373 10-pack above, making it the clear investment for households with multiple watches and gadgets.
The brand leans on its Swiss heritage and a “Superior Leakage Resistance” claim, which matters because a leaking watch battery can damage the movement. Owners call the cells exactly as described and highlight the quick delivery and good price as the main draws — the consistency of a 5-star reception is itself the story here. The only friction in the feedback is shipping: some buyers prefer Amazon’s own tracking over the USPS handling used here, but that’s a logistics nitpick, not a battery complaint.
If you own several 377-sized watches, key fobs, or small electronics, this 20-pack is the most future-proof way to buy. It’s the pick for the person who never wants to run out of a working cell again.
Why it wins: 20 cells at a strong price with Swiss build quality — the per-battery cost drops dramatically at this count.
Best for: households with multiple 377 devices that want a years-long supply in one buy.
Not for: buyers who only need one or two batteries now and don’t want to store 20.
4. Maxell SR927W 1.55v 399 Watch Battery (5 Batteries)
A 0% mercury cell with a leak-resistance design that owners call a perfect fit.
When your watch needs the larger 9.5mm x 2.6mm cell, the Maxell 399 (SR927W) is the go-to. This 5-pack keeps the per-cell cost well below what a single one costs at a big-box store, and it’s rated at 1.55 volts with a stable silver oxide discharge. Owners describe inserting it as easy: “Excellent replacement batteries, fit perfectly with ease.”
Value for money is the trait owners praise most here, with functionality close behind — the battery drops in and the watch simply works. One owner highlights how a big-box store wanted the same price for a single cell, making the DIY route after buying a few tools a clear win. The honest caveat: battery life gets mixed feedback, with some owners noting longer shelf life while others feel the power doesn’t run certain watches effectively — so match the 399 size to a watch that actually calls for it.
At 0.32 ounces for the 5-cell pack, this is the lightest option here — it slips easily into a travel kit or drawer. If your watch takes the 399 size, this is the quality-to-value standout versus the bulkier packs like the 20-cell Renata 371.
The strengths
- Owners praise the perfect fit and easy installation
- 0% mercury with leak-resistance design
- 5-pack beats single-cell store pricing
The caveat
- Battery life feedback is mixed across different watches
- Only 5 cells — smaller count than bulk options
Grab this if: your watch takes the 399 size and you want a leak-resistant, easy-fit cell at a fair price.
skip it if: you need the smaller 377 size or want more than 5 spares on hand.
5. #371 Renata Watch Batteries 20Pcs
Twenty 371 cells from Renata’s Swiss lineup, praised for matching the description perfectly.
This is the 371-size counterpart to the Renata 377 above, and it serves watches and devices that need the wider SR920SW cell. The 20-pack is a generous bulk count that immediately solves the “I’m out of batteries again” problem for good. At 0.74 ounces for the whole pack, it’s the heaviest of the Renata options here — that’s a 2.3x weight gap versus the 5-pack Maxell above, but the extra weight is just the physical reality of shipping 20 metal cells.
Owner feedback is sparse but uniformly positive, with the central message being that the batteries are exactly as pictured and described at a very good price. Owners mention: “Batteries are exactly as pictured/described for a Very good price!” — a clean confirmation that what you order is what arrives. The seller (FindingKing) has kept this listing going since 2010, which speaks to its staying power as a consistent source.
If you have a watch that takes the 371 size and you want a Swiss brand in a big pack, this is the straightforward, no-frills buy. It doesn’t market fancy features — it just delivers a stack of reliable cells at a price that makes per-battery math easy.
The bottom line: A dependable 20-pack of Renata 371 cells for buyers who know exactly what size they need and want maximum count.
Perfect for: anyone with multiple 371-size watches who wants a Swiss brand in bulk.
Consider others if: you’re unsure of your battery size — the 377 is more common across everyday watches.
6. 12-Pack Duracell 377 Batteries 1.5 Volt
Twelve fresh 377 cells for the watch collector who refuses to pay retail per battery.
This is the bigger sibling to the 6-pack Duracell at the top — same 377 size, but double the count at 12 cells. That makes it the smarter buy if you’re regularly changing batteries across several watches. One owner who loves watches sums up the appeal: “most take this battery. So, it makes sense and at a reasonable price.” It’s rated at 1.5 volts, and the brand promises button batteries that are fresh on arrival.
Battery quality and value for money are the two traits owners call out most, and the feedback skews toward genuine satisfaction — “Great value for a great brand. Excellent battery life, easy to install and functions accordingly.” The one honest wrinkle in the data is a single owner who found one dead cell out of a six-pack; that’s a rare occurrence, sized here as the occasional bad apple rather than a pattern, and it didn’t stop that buyer from being “very, very pleased” overall.
If you’ve already decided Duracell is your brand on the 6-pack, this 12-pack is the logical upgrade for barely more money. It’s the pick when you want the household name and enough spares to forget about battery shopping for a long stretch — and it gives you double the cells of the Renata 377 20-pack for a similar commitment.
Why it earns its place: Doubling the count over the 6-pack for similar money, with the same trusted Duracell quality owners praise.
Best suited to: multi-watch owners who want the Duracell name in a 12-cell supply.
Maybe skip if: you don’t need this many spares — the 6-pack is plenty for a single watch.
7. SR920SW 80 Pack Watch Battery (371/AG6/LR920)
Eighty cells at 40mAh each — the endgame bulk buy for the serious watch collector.
This FOZAOAXE pack is the ultimate value play in a 371-compatible size (SR920SW, fitting 371, AG6, LR920, SR69, 370, and SG6). Each cell delivers a 40 milliamp-hour capacity at a stable 1.55 volts, which is the highest capacity rating in this guide — enough to keep an analog or quartz watch ticking accurately, plus power thermometers and calculators. The manufacturer claims a 3-year shelf life, so an 80-cell stash can sit ready for years.
Advanced sealing prevents leaks, and the -20°C to +60°C range handles freezing garages and hot car dashes. Customers note the cells fit perfectly and restore watches to working condition, with the count making value obvious: “It’s nice having multiple batteries on hand for future replacements.” The brand is less established than Duracell or Renata, so you’re trading household-name recognition for an unbeatable per-cell cost.
This is the buy for someone with many 371-size devices or a small repair hobby. If you’re stocking a family of watches and gadgets, 80 cells is effectively a lifetime supply — and the 40mAh capacity gives each one strong staying power that beats the 24mAh 377 cells in the Renata pack.
The big wins
- 80 cells at the lowest per-battery cost here
- 40mAh capacity — highest in this guide
- Leak-proof claim with wide -20°C to +60°C range
What to weigh
- Lesser-known brand without the household-name trust
- Bulk count is overkill for a single watch
Buy this for: maximum capacity and count at a rock-bottom per-cell price for multiple devices.
Pass if: you want a proven brand name or only need a handful of cells for one watch.
Understanding the Specs
Voltage (1.55V) & Chemistry
Silver oxide cells deliver a steady 1.55 volts, which is the balance for quartz watches. That stable output keeps the second hand sweeping accurately until the cell is near-empty, unlike cheaper alkaline cells that fade early. If a battery’s voltage is right but the watch runs slow, the issue is usually size or a worn movement, not the cell.
Capacity (mAh) & Size Codes
Milliamp-hours (mAh) tell you the energy stored — more mAh generally means longer runtime before a swap. A 40mAh SR920SW outlasts a 24mAh 377 in compatible watches. Size codes (377, 371, 399, 373) are physical dimensions, so always match them exactly; a 373 (SR916SW) and a 377 (SR626SW) are different diameters and won’t interchange even though both run at 1.55V.
FAQ
How do I know which battery size my watch needs?
What is the difference between a 377 and a 371 battery?
Are all watch batteries 1.55 volts?
How long does a watch battery last?
Will a 371 battery fit a watch that takes a 377?
Is it worth buying watch batteries in bulk?
Do these batteries leak and damage my watch?
What is the shelf life of an unused watch battery?
Final Thoughts: The Verdict
For most owners, the batteries for watches winner is the Duracell 377 6-Pack because it pairs a household-name brand with reliable 1.55V silver oxide power and enough spares for everyday needs. If you want the biggest count in a trusted Swiss brand, the Renata 377 20-Count is the stock-up pick. And for maximum capacity at the lowest per-cell cost, the FOZAOAXE SR920SW 80-Pack is the one to reach for when you have many devices to feed.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of August 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, The Tools Trunk earns from qualifying purchases. This does not affect which products we feature.