---
title: "3.7v Lithium Ion Battery — $37K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/3-7v-lithium-ion-battery"
last_updated: "2026-08-09T12:16:45.631Z"
locale: en
meta:
description: "Niche score 53/100 · $37K/yr market · 59K searches/yr · $14.96 avg price. A small market ($37K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 53/100 · $37K/yr market · 59K searches/yr · $14.96 avg price. A small market ($37K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:title": "3.7v Lithium Ion Battery — $37K/yr Amazon US Niche (2026) - Flapen"
---
# **3.7v lithium ion battery**
**Worth a look**
Shows a thin review moat (132 avg reviews), but a small market ($37K/yr) keeps it on the watch list.
Market size 9Growth 46Conversion 51Competition 56Returns 73Price range 52Avg price 75Brand share 49Review moat 93Quality gap 76
**Review moat**
**Great****132.15**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Great****4.3★**
avg incumbent rating — lower means beatable quality
**Avg price**
**Great****$14.96**
avg listing price — sweet spot $15–$100
**Returns**
**Good****2.1%**
return rate — above 5% kills the launch gate
**Competition**
**Good****52%**
top-5 click share — leaders hold, buyers still browse
**Price range**
**Good****$6.86–$23.82**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Good****4.2%**
search→purchase rate — share of searches ending in a sale
**Brand share**
**Okay****75%**
top-5 brand share — brands hold most of the demand
**Growth**
**Okay****+16.8%**
90-day search growth — must beat 0% to launch
**Market size**
**Bad****$37K**
$37K/yr · 59K searches
According to Flapen's Amazon United States niche tracking, 3.7v lithium ion battery is a $37K/yr Amazon United States market (59K searches/yr). The top 5 brands hold 75% of demand. Demand peaks in Nov. Verdict: Worth a look — 53/100.
Data updated Jul 21, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **3.7v lithium ion battery market data**
- **Units sold / yr**
- **3K–4K**
- avg 100–250/product
- **Revenue / yr**
- **$45K–$60K**
- units × avg price
- **Conversion rate**
- **4.2%**
- **Avg BSR**
- **#1,193**
- **Page quality**
- **0%**
- **Prime**
- **63%**
- **Sponsored**
- **78%**
- **Out of stock**
- **16.7%**
- **Avg brand age**
- **28 months**
- **Avg seller age**
- **193 days**
## **Competition & brand share**
The top 5 products take 52% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**19 **▲rising
**Sellers**
**48**
**Top-5 brand share**
**75%**
Top 20: 100%
**Top-5 click share**
**52%**
Top 20: 94%
**Open market**
**20%**
- Generic36% - Renyqatt16% - WANGDAJIEDIAN12% - valuoso5% - QOJH5% - XINGHANTU4%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +16.8% search growth over the last 90 days.
2K1KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Nov · busiest ÷ quietest = 1.7×
[**Open Trend **](https://flapen.com/research/us/health-household/3-7v-lithium-ion-battery/trend)
## **Top 3.7v lithium ion battery search terms**
- **icr18650 battery**24K/yr-15.5%2.1% conv. - **18650 1200mah 3.7v battery**8K/yr+83.5%2.3% conv. - **icr 18650 2200mah 3.7v 8.14wh battery**5K/yr+56.5%4.3% conv. - **18650 2000mah 3.7v battery**5K/yr+74.5%1.3% conv. - **icr18650 2000mah 3.7v battery**7K/yr+20.5%1.6% conv. - **2200mah 3.7v rechargeable battery**5K/yr-0.5%3.2% conv. - **18650 2000mah battery 3.7v li-ion rechargeable lithium batteries**4K/yr+17.4%1.0% conv. - **18650 li-ion battery 2000mah**2K/yr+62.9%0.4% conv. [**All search terms **](https://flapen.com/research/us/health-household/3-7v-lithium-ion-battery/search-terms)
## **Top 3.7v lithium ion 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%4%$1K8%$3K12%$4K16%$6K1101001K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)2 products missing review or click data not plotted
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**3.7 USB Battery Charger with 2 Pack 3 7 2200mAh Button Top Battery Ni-MH 2 Bay LCD Display Smart Universal USB Battery Chargers for Flashlights Headlamps Doorbells RC Cars Outdoor Garden Lights etc**Generic**$17.74**4.5★376 rev](https://www.amazon.com/dp/B0FQ9QQ64K) [2**18650 Battery Charger Suitable for Lithium Battery 18650 20700 10440 14500 18500 16340 17500 Battery Charger USB Single Slot li-ion Rechargeable Battery Charger (Battery not Included)**WANGDAJIEDIAN**$6.86**4.4★887 rev](https://www.amazon.com/dp/B0BFCKX5FL) [3**2 Pack 3200 mAh Battery Ni-MH Rechargeable Button Top NiMH Batteries High Capacity Battery for LED Flashlight Headlamp Camera RC Car Mini Fans etc with Storage Box Blue**Generic**$14.06**4.0★40 rev](https://www.amazon.com/dp/B0FGPBN49P) [4**3.7 USB Battery Charger with 2 Pack 3 7 2200mAh Flat Top Battery Ni-MH 2 Bay LCD Display Smart Universal USB Battery Chargers for Flashlights Headlamps Doorbells RC Cars Outdoor Garden Lights etc**Generic**$17.74**4.5★376 rev](https://www.amazon.com/dp/B0FQB9BGTP) [5**Renyqatt 2 Pack Batteries 2600mAh Button Top Rechargeable Battery Ni-MH AA 2600mah Rechargeable Batteries for LED Flashlight Headlamps Doorbells RC Cars**Renyqatt**$13.64**4.4★29 rev](https://www.amazon.com/dp/B0GC5VV1GY)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**QOJH 2 Pack Ni-MH Battery 18650 Replacement Battery 1800mAh High Capacity Button Top for Flashlight Headlamp and RC Car etc**QOJH**$15.49**5 rev2mo ago](https://www.amazon.com/dp/B0H1KPTV5D) [**Svenirven Battery 2 Packs 3300mAh Button Top Battery Ni-MH Rechargeable Batteries for Headlamp LED Flashlight Electronic Devices etc (Blue)**Svenirven**$15.83**1 rev2mo ago](https://www.amazon.com/dp/B0GW8GH5L7) [**MLGBDC 18650 Rechargeable Battery 3.7Volt 2000mAh Li-ion Battery XH-2 Pin Plug with USB Charger Cable for Flashlights DIY Battery Pack Electric Toys Remote Control Cars etc**MLGBDC**$17.68**2 rev3mo ago](https://www.amazon.com/dp/B0GX1DMX8P) [**Betteryseler 1pc 3.7V 2600MAh ICR18650 Rechargeable Lithium ion Battery with JST XH 2.54 Plug for Croove Portable Voice Amplifier Replacement Battery (1x 18650 jst-XH 3.7v 9.62Wh/2.6Ah 1S1P) Blue**Betteryseler**$12.72**0 rev3mo ago](https://www.amazon.com/dp/B0GV8PPYBV) [**PQJDJDCNB 3.7 V 2000 MAh Li Large Capacity Portable Replacement 1200s Long Life Pack of 4pcs**PQJDJDCNB**$21.29**0 rev4mo ago](https://www.amazon.com/dp/B0GS27GW59)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**XINLANTECH 18650 1s2p 5200mAh 3.7v Rechargeable Lithium-ion Battery with Jst XH2.54/3P Connector Plug Wire / 5C Cells/Support Fast Charging**XINLANTECH**$18.27**3.8★**▲ 83%**](https://www.amazon.com/dp/B0FDSHKB49) [**PQJDJDCNB 3.7 V 2000 MAh Li Large Capacity Portable Replacement 1200s Long Life Pack of 4pcs**PQJDJDCNB**$21.29**0.0★**▲ 83%**](https://www.amazon.com/dp/B0GS27GW59) [**Betteryseler 1pc 3.7V 2600MAh ICR18650 Rechargeable Lithium ion Battery with JST XH 2.54 Plug for Croove Portable Voice Amplifier Replacement Battery (1x 18650 jst-XH 3.7v 9.62Wh/2.6Ah 1S1P) Blue**Betteryseler**$12.72**0.0★**▲ 82%**](https://www.amazon.com/dp/B0GV8PPYBV) [**MLGBDC 18650 Rechargeable Battery 3.7Volt 2000mAh Li-ion Battery XH-2 Pin Plug with USB Charger Cable for Flashlights DIY Battery Pack Electric Toys Remote Control Cars etc**MLGBDC**$17.68**3.0★**▲ 82%**](https://www.amazon.com/dp/B0GX1DMX8P) [**QOJH 2 Pack Ni-MH Battery 18650 Replacement Battery 1800mAh High Capacity Button Top for Flashlight Headlamp and RC Car etc**QOJH**$15.49**5.0★**▲ 82%**](https://www.amazon.com/dp/B0H1KPTV5D)
**~~View all trending →~~**
## **What buyers say about 3.7v lithium ion battery**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Battery Life**22%
*“Battery works”*
**Charging**20%
*“Charging time was quick”*
**Advertised Vs Actual Product**13%
*“As advertised”*
**Value For Money**9%
*“Worth Buying”*
**Quality-Overall**8%
*“Good quality”*
**Size-Overall**6%
*“Fit was perfect”*
**Ease Of Use**4%
*“Easy to use”*
**Brightness/Shine/Glow**3%
*“the lamp is as bright as ever”*
**Functionality-Overall**3%
*“But it worked as planned”*
**Compatibility-Overall**1%
*“# compatability”*
### **What buyers complain about **
**Charging**30%
*“The charger did not charge the battery”*
**Battery Life**14%
*“Slightly short battery”*
**Quality-Overall**9%
*“Absolute trash”*
**Functionality-Overall**9%
*“It didnt fix the problem”*
**Durability**4%
*“last ten times longer than these”*
**Size-Overall**3%
*“They do not fit what is described to fut”*
**Strength**3%
*“It's a bit flimsy”*
**Compatibility-Overall**3%
*“Battery doesn't work in the headlamp”*
**Value For Money**2%
*“Very cheap”*
**Defective Material/Parts**2%
*“Product did not work at all”*
### **Top return reasons **
**Size-Overall**29%
**Charging**23%
**Compatibility-Overall**13%
**Functionality-Overall**10%
**Advertised Vs Actual Product**7%
**Defective Material/Parts**3%
**Battery Life**3%
**Socket/Port/Plug**3%
**Connectivity-Overall**3%
**Value For Money**2%
## **Common questions**
- **Is 3.7v lithium ion battery profitable to sell on Amazon United States?**
- The niche generates $37K/yr across 27 tracked products. 5 of 12 products launched in the last 360 days are still selling. 90-day search growth is +16.8%. Flapen's verdict: Worth a look (53/100).
- **How competitive is the 3.7v lithium ion battery niche?**
- 19 brands and 48 sellers compete. The top 5 products take 52% of clicks and top 5 brands hold 75% of demand.
- **What do buyers complain about in 3.7v lithium ion battery?**
- Top complaints mined from reviews: Charging, Battery Life, Quality-Overall. The return rate is 2.1%.
- **When does demand for 3.7v lithium ion battery peak?**
- Demand peaks in Nov; the busiest month runs 1.7× the quietest.
- **What does it cost to enter the 3.7v lithium ion battery niche?**
- Listings span $6.86–$23.82; the average listing price is $14.96 (sweet spot $15–$100). The average incumbent carries 132 reviews — the moat a new listing must climb.
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