---
title: "321 Watch Battery — $155K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/321-watch-battery"
last_updated: "2026-08-06T18:48:37.183Z"
locale: en
meta:
description: "Niche score 41/100 · $155K/yr market · 104K searches/yr · $5.87 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 41/100 · $155K/yr market · 104K searches/yr · $5.87 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "321 Watch Battery — $155K/yr Amazon US Niche (2026) - Flapen"
---
# **321 watch battery**
**Skip it**
Prices mostly outside the sweet spot ($3.47–$8.17) — this niche doesn't clear our bar today.
Market size 33Growth 35Conversion 100Competition 32Returns 99Price range 0Avg price 16Brand share 20Review moat 16Quality gap 21
**Conversion**
**Incredible****25.3%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.2%**
return rate — above 5% kills the launch gate
**Growth**
**Okay****+7.9%**
90-day search growth — must beat 0% to launch
**Market size**
**Okay****$155K**
$155K/yr · 104K searches
**Competition**
**Okay****66%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Bad****92%**
top-5 brand share — brand-locked demand
**Review moat**
**Bad****20,558.92**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Bad****$5.87**
avg listing price — sweet spot $15–$100
**Price range**
**Bad****$3.47–$8.17**
cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United States niche tracking, 321 watch battery is a $155K/yr Amazon United States market (104K searches/yr). The top 5 brands hold 92% of demand. Verdict: Skip it — 41/100.
Data updated Jul 21, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **321 watch battery market data**
- **Units sold / yr**
- **20K–25K**
- avg 1,250–1,500/product
- **Revenue / yr**
- **$117K–$147K**
- units × avg price
- **Conversion rate**
- **25.3%**
- **Avg BSR**
- **#433**
- **Page quality**
- **0%**
- **Prime**
- **85%**
- **Sponsored**
- **38%**
- **Out of stock**
- **0.9%**
- **Avg brand age**
- **70 months**
- **Avg seller age**
- **170 days**
## **Competition & brand share**
The top 5 products take 66% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**7 **▲rising
**Sellers**
**32**
**Top-5 brand share**
**92%**
Top 20: 100%
**Top-5 click share**
**66%**
Top 20: 100%
**Open market**
**3%**
- Energizer38% - Renata32% - UOGTNON10% - Amazon Basics6% - Murata6% - SKOANBE5% - Open — no brand owns it (1 brand, 3%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +7.9% search growth over the last 90 days.
2K2K seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.2×
[**Open Trend **](https://flapen.com/research/us/health-household/321-watch-battery/trend)
## **Top 321 watch battery search terms**
- **321 watch battery**38K/yr+7.4%24.7% conv. - **sr616sw watch battery**21K/yr+5.5%23.1% conv. - **watch battery 321**10K/yr+16.4%21.8% conv. - **sr616sw**8K/yr+21.6%20.1% conv. - **321**7K/yr+2.1%1.3% conv. - **321 battery**7K/yr+8.8%21.9% conv. - **renata 321 watch battery**5K/yr+18.9%26.5% conv. - **battery 321**3K/yr-8.1%25.4% conv. - **energizer 321 watch battery**3K/yr+6.3%35.7% conv. - **sr616sw battery**3K/yr-16.1%21.3% conv. [**All search terms **](https://flapen.com/research/us/health-household/321-watch-battery/search-terms)
## **Top 321 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%10%$15K20%$31K30%$46K40%$62K101001K10K100K1.0M Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 13 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**5 321 Energizer Watch Batteries SR616SW Battery Cell (5 Batteries Per Pack)**Energizer**$7.83**4.7★3,601 rev](https://www.amazon.com/dp/B000RB082W) [2**Renata Watch Battery 321 0%Hg Mercury Free X 3**Renata**$5.51**4.6★1,841 rev](https://www.amazon.com/dp/B00NHYB6VI) [3**Energizer 321 SR616SW Silver Oxide 5 Count (Pack of 1)**Energizer**$7.63**4.7★764 rev](https://www.amazon.com/dp/B0035HCXPU) [4**UOGTNON 321 SR616SW Watch Battery 1.5V Button Cell (10-Pack)**UOGTNON**$7.38**4.7★1,312 rev](https://www.amazon.com/dp/B07XBRDB9W) [5**Renata 321 SR616SW Batteries - 1.55V Silver Oxide 321 Watch Battery (2 Count)**Renata**$3.50**4.8★384 rev](https://www.amazon.com/dp/B09VVL1N19)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Renata 321 SR616SW Batteries - 1.55V Silver Oxide 321 Watch Battery (2 Count)**Renata**$3.50**384 rev4y ago](https://www.amazon.com/dp/B09VVL1N19) [**KaPonsec 321 SR616SW 1.5V Silver Oxide Watch Battery (10-Pack)**KaPonsec**$6.98**67 rev4y ago](https://www.amazon.com/dp/B09B6S2VK2) [**SKOANBE 321 SR616SW 1.5V Watch Battery Button Cell (10-Pack)**SKOANBE**$8.17**313 rev5y ago](https://www.amazon.com/dp/B08MYH43PV) [**Murata 321 Battery SR616SW 1.55V Silver Oxide Watch Button Cell (5 Batteries)**Murata**$5.97**1,000 rev6y ago](https://www.amazon.com/dp/B0848LPCVZ) [**UOGTNON 321 SR616SW Watch Battery 1.5V Button Cell (10-Pack)**UOGTNON**$7.38**1,312 rev6y ago](https://www.amazon.com/dp/B07XBRDB9W)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**SKOANBE 321 SR616SW 1.5V Watch Battery Button Cell (10-Pack)**SKOANBE**$8.17**4.7★**▲ 128%**](https://www.amazon.com/dp/B08MYH43PV) [**KaPonsec 321 SR616SW 1.5V Silver Oxide Watch Battery (10-Pack)**KaPonsec**$6.98**4.5★**▲ 80%**](https://www.amazon.com/dp/B09B6S2VK2) [**Amazon Basics CR2032 3V Lithium Coin Cell Batteries Child-Proof Package Non-Coated AirTag Compatible 4-Pack**Amazon Basics**$4.82**4.7★**▲ 58%**](https://www.amazon.com/dp/B0787K2XWZ) [**Renata 321 SR616SW Batteries - 1.55V Silver Oxide 321 Watch Battery (2 Count)**Renata**$3.50**4.8★**▲ 47%**](https://www.amazon.com/dp/B09VVL1N19) [**5 321 Energizer Watch Batteries SR616SW Battery Cell (5 Batteries Per Pack)**Energizer**$7.83**4.7★**▲ 29%**](https://www.amazon.com/dp/B000RB082W)
**~~View all trending →~~**
## **What buyers say about 321 watch battery**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Value For Money**27%
*“Great Deal”*
**Battery Life**22%
*“good battery's”*
**Quality-Overall**16%
*“Excellent product”*
**Advertised Vs Actual Product**12%
*“Item arrived as described”*
**Size-Overall**6%
*“In this case they were a perfect fit”*
**Efficiency**4%
*“Gets the job done”*
**Compatibility-Overall**3%
*“Works perfectly in small electronics”*
**Durability**2%
*“Long lasting & easy to use”*
**Ease Of Use**1%
*“Useful”*
**Charging**1%
*“Fully charged”*
### **What buyers complain about **
**Battery Life**42%
*“Bad batteries”*
**Durability**15%
*“Don't last”*
**Functionality-Overall**7%
*“Does not work properly at all”*
**Quality-Overall**6%
*“Poor performance Air Tags”*
**Charging**4%
*“message follows the battery so definitely poor charge”*
**Size-Overall**3%
*“thus won't fit”*
**Compatibility-Overall**3%
*“Won't fine in my bs monitor”*
**Thickness**3%
*“These batteries are not even the same thickness as my old batteries”*
**Ease Of Use**2%
*“it's really, really difficult to get them out of the packaging”*
**Value For Money**2%
*“Cheap”*
### **Top return reasons **
**Size-Overall**52%
**Compatibility-Overall**12%
**Value For Money**11%
**Functionality-Overall**8%
**Battery Life**7%
**Advertised Vs Actual Product**5%
**Durability**1%
**Charging**1%
**Assembly/Installation**1%
**Product Condition**0%
## **Common questions**
- **Is 321 watch battery profitable to sell on Amazon United States?**
- The niche generates $155K/yr across 13 tracked products. 90-day search growth is +7.9%. Flapen's verdict: Skip it (41/100).
- **How competitive is the 321 watch battery niche?**
- 7 brands and 32 sellers compete. The top 5 products take 66% of clicks and top 5 brands hold 92% of demand.
- **What do buyers complain about in 321 watch battery?**
- Top complaints mined from reviews: Battery Life, Durability, Functionality-Overall. The return rate is 0.2%.
- **When does demand for 321 watch battery peak?**
- Demand is steady year-round — the busiest month runs 1.2× the quietest.
- **What does it cost to enter the 321 watch battery niche?**
- Listings span $3.47–$8.17; the average listing price is $5.87 (sweet spot $15–$100). The average incumbent carries 20,559 reviews — the moat a new listing must climb.
## **Related niches in Health & Household**
- 76 [**cedar oil**](https://flapen.com/research/us/health-household/cedar-oil)$1.2M/yr+214.4%**Launch it**- 77 [**nutrapure glp1 cutting mix**](https://flapen.com/research/us/health-household/nutrapure-glp1-cutting-mix)$149K/yr+940.2%**Worth a look**- 77 [**dexcom g7**](https://flapen.com/research/us/health-household/dexcom-g7)$2.0M/yr+39.9%**Launch it**- 77 [**purelia**](https://flapen.com/research/us/health-household/purelia)$635K/yr+359.7%**Worth a look**- 77 [**graduation napkins**](https://flapen.com/research/us/health-household/graduation-napkins)$302K/yr+385.7%**Worth a look**- 77 [**credit card wand**](https://flapen.com/research/us/health-household/credit-card-wand)$418K/yr+101.3%**Worth a look**[**All Health & Household niches **](https://flapen.com/research/us/health-household)