---
title: "Sr621sw Watch Battery — $636K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/sr621sw-watch-battery"
last_updated: "2026-08-11T01:25:16.320Z"
locale: en
meta:
description: "Niche score 56/100 · $636K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 56/100 · $636K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Sr621sw Watch Battery — $636K/yr Amazon US Niche (2026) - Flapen"
---
# **sr621sw watch battery**
**Worth a look**
Shows searches that convert (23.4% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 66Growth 40Conversion 100Competition 59Returns 97Price range 0Avg price 15Brand share 62Review moat 44Quality gap 21
**Conversion**
**Incredible****23.4%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.6%**
return rate — above 5% kills the launch gate
**Market size**
**Good****$636K**
$636K/yr · 504K searches
**Brand share**
**Good****68%**
top-5 brand share — brands hold most of the demand
**Competition**
**Good****49%**
top-5 click share — leaders hold, buyers still browse
**Review moat**
**Okay****2,142.32**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Okay****+12.4%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Avg price**
**Bad****$5.39**
avg listing price — sweet spot $15–$100
**Price range**
**Bad****$2.21–$9.60**
cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United States niche tracking, sr621sw watch battery is a $636K/yr Amazon United States market (504K searches/yr). The top 5 brands hold 68% of demand. Verdict: Worth a look — 56/100.
Data updated Jul 21, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **sr621sw watch battery market data**
- **Units sold / yr**
- **100K–125K**
- avg 5,000–6,000/product
- **Revenue / yr**
- **$539K–$674K**
- units × avg price
- **Conversion rate**
- **23.4%**
- **Avg BSR**
- **#256**
- **Page quality**
- **0%**
- **Prime**
- **91%**
- **Sponsored**
- **50%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **62 months**
- **Avg seller age**
- **169 days**
## **Competition & brand share**
The top 5 products take 49% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**14 **▲rising
**Sellers**
**46**
**Top-5 brand share**
**68%**
Top 20: 100%
**Top-5 click share**
**49%**
Top 20: 98%
**Open market**
**25%**
- Energizer27% - Renata15% - Cotchear9% - DURNERGY9% - LiCB8% - DURACELL8%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +12.4% search growth over the last 90 days.
12K8KHoliday '25 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/us/health-household/sr621sw-watch-battery/trend)
## **Top sr621sw watch battery search terms**
- **sr621sw watch battery**141K/yr+10.2%20.7% conv. - **364 watch battery**94K/yr+20.0%21.4% conv. - **sr621sw**48K/yr+20.5%17.8% conv. - **watch battery 364**37K/yr+14.7%17.6% conv. - **sr621sw battery**30K/yr+4.6%16.0% conv. - **364/363 watch battery**19K/yr+13.5%21.7% conv. - **364 battery**23K/yr-4.3%17.1% conv. - **watch battery sr621sw**17K/yr+19.4%16.4% conv. - **renata 364 watch battery**15K/yr+19.1%23.7% conv. - **watch batteries 364**11K/yr+5.3%15.7% conv. [**All search terms **](https://flapen.com/research/us/health-household/sr621sw-watch-battery/search-terms)
## **Top sr621sw watch battery products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%5%$32K10%$64K15%$95K20%$127K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 22 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Energizer 364-363 1.55v #364/363 Low-drain Battery (SR621SW) Pack of 5 Batteries.**Energizer**$6.09**4.6★5,333 rev](https://www.amazon.com/dp/B0064T3NCI) [2**2 X Energizer 364 363 Silver Oxide Watch Batteries SR621SW SR60**Energizer**$4.96**4.7★417 rev](https://www.amazon.com/dp/B010KG4D2O) [3**Renata 364 SR621SW Batteries - 1.55V Silver Oxide 364 Watch Battery (2 Count)**Renata**$4.92**4.6★6,347 rev](https://www.amazon.com/dp/B09VVNZ3J3) [4**DURNERGY SR621SW Watch Battery 10 Pcs AG1 Battery Watch Batteries 364 363 Alkaline Coin Button Cell Battery LR621 Green Battery**DURNERGY**$4.89**4.7★368 rev](https://www.amazon.com/dp/B0CN6VNSR1) [5**LiCB 20 Pack SR621SW 364 164 363 AG1 Battery 1.5V Button Cell Watch Batteries**LiCB**$7.03**4.7★8,923 rev](https://www.amazon.com/dp/B07DF6YP1J)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**FOZAOAXE AG1 SR621SW Watch Battery 10 Pack 364 Watch Batteries Long-Lasting & Leak-Proof LR621 164 SR60 Silver Oxide Button Coin Cell Battery**FOZAOAXE**$6.65**59 rev8mo ago](https://www.amazon.com/dp/B0G1YFYTX8) [**PKCELL 20 Pack SR621sw Watch Battery AG1 Battery 1.5V LR621 363 364 Watch Batteries**PKCELL**$6.15**818 rev1y ago](https://www.amazon.com/dp/B0D72Y5LGT) [**10 Pack 364 SR621SW Watch Battery 363 164 AG1 1.55V Silver Oxide Battery**Vtreneg**$5.80**239 rev2y ago](https://www.amazon.com/dp/B0D97YZHMM) [**DURNERGY SR621SW Watch Battery 10 Pcs AG1 Battery Watch Batteries 364 363 Alkaline Coin Button Cell Battery LR621 Green Battery**DURNERGY**$4.89**368 rev2y ago](https://www.amazon.com/dp/B0CN6VNSR1) [**DURNERGY SR621SW Watch Battery 100 Pcs AG1 Battery Watch Batteries 364 363 Alkaline Coin Button Cell Battery LR621 Green Battery**DURNERGY**$9.60**368 rev2y ago](https://www.amazon.com/dp/B0CM99TZ4V)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**FOZAOAXE AG1 SR621SW Watch Battery 10 Pack 364 Watch Batteries Long-Lasting & Leak-Proof LR621 164 SR60 Silver Oxide Button Coin Cell Battery**FOZAOAXE**$6.65**4.7★**▲ 276%**](https://www.amazon.com/dp/B0G1YFYTX8) [**Seizaiken 364 SR621SW 1.55V 0% Hg Silver Oxide Watch Battery (2 Batteries) Made in Japan by Seiko**Seizaiken**$4.08**4.7★**▲ 219%**](https://www.amazon.com/dp/B0B2FHWCTL) [**DURNERGY SR621SW Watch Battery 100 Pcs AG1 Battery Watch Batteries 364 363 Alkaline Coin Button Cell Battery LR621 Green Battery**DURNERGY**$9.60**4.7★**▲ 132%**](https://www.amazon.com/dp/B0CM99TZ4V) [**PKCELL 20 Pack SR621sw Watch Battery AG1 Battery 1.5V LR621 363 364 Watch Batteries**PKCELL**$6.15**4.7★**▲ 109%**](https://www.amazon.com/dp/B0D72Y5LGT) [**DURNERGY SR621SW Watch Battery 10 Pcs AG1 Battery Watch Batteries 364 363 Alkaline Coin Button Cell Battery LR621 Green Battery**DURNERGY**$4.89**4.7★**▲ 107%**](https://www.amazon.com/dp/B0CN6VNSR1)
**~~View all trending →~~**
## **What buyers say about sr621sw watch battery**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Value For Money**23%
*“Great Value”*
**Battery Life**22%
*“Battery So far, so good”*
**Quality-Overall**14%
*“Its quality feels solid”*
**Advertised Vs Actual Product**13%
*“As advertised”*
**Size-Overall**10%
*“Fits good”*
**Efficiency**4%
*“Works well for everyday use”*
**Durability**3%
*“have found them very reliable They are long lasting”*
**Ease Of Use**3%
*“easy to use”*
**Assembly/Installation**2%
*“Easy to install”*
**Energy Level**1%
*“Energizer cells always meet my expectations”*
### **What buyers complain about **
**Battery Life**48%
*“Bad Batteries”*
**Durability**14%
*“Did not last”*
**Size-Overall**8%
*“Incorrect size”*
**Quality-Overall**6%
*“Poor quality”*
**Advertised Vs Actual Product**5%
*“Dont match the listing picture”*
**Charging**2%
*“No charge”*
**Compatibility-Overall**2%
*“Not compatible”*
**Watch Mechanism**1%
*“lasted almost 1 whole day in a watch before dying, Checked with voltmeter, 100% dead”*
**Unsustainable Design**1%
*“Certainly not manufactured to specification”*
**Stale/Rotten/Spoiled**1%
*“They were not especially fresh”*
### **Top return reasons **
**Size-Overall**53%
**Functionality-Overall**11%
**Battery Life**10%
**Compatibility-Overall**7%
**Advertised Vs Actual Product**6%
**Value For Money**5%
**Charging**2%
**Defective Material/Parts**1%
**Quality-Overall**1%
**Product Condition**1%
## **Common questions**
- **Is sr621sw watch battery profitable to sell on Amazon United States?**
- The niche generates $636K/yr across 22 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +12.4%. Flapen's verdict: Worth a look (56/100).
- **How competitive is the sr621sw watch battery niche?**
- 14 brands and 46 sellers compete. The top 5 products take 49% of clicks and top 5 brands hold 68% of demand.
- **What do buyers complain about in sr621sw watch battery?**
- Top complaints mined from reviews: Battery Life, Durability, Size-Overall. The return rate is 0.6%.
- **When does demand for sr621sw watch battery peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the sr621sw watch battery niche?**
- Listings span $2.21–$9.60; the average listing price is $5.39 (sweet spot $15–$100). The average incumbent carries 2,142 reviews — the moat a new listing must climb.
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