---
title: "3.7v Battery Charger — $69K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/electronics/3-7v-battery-charger"
last_updated: "2026-08-11T02:20:16.302Z"
locale: en
meta:
description: "Niche score 50/100 · $69K/yr market · 76K searches/yr · $9.99 avg price. A small market ($69K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 50/100 · $69K/yr market · 76K searches/yr · $9.99 avg price. A small market ($69K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:title": "3.7v Battery Charger — $69K/yr Amazon US Niche (2026) - Flapen"
---
# **3.7v battery charger**
**Worth a look**
Shows searches that convert (9.1% search→purchase), but a small market ($69K/yr) keeps it on the watch list.
Market size 17Growth 22Conversion 83Competition 54Returns 70Price range 33Avg price 33Brand share 77Review moat 81Quality gap 52
**Conversion**
**Great****9.1%**
search→purchase rate — share of searches ending in a sale
**Review moat**
**Great****383.56**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Great****58%**
top-5 brand share — no brand owns this niche
**Returns**
**Good****2.2%**
return rate — above 5% kills the launch gate
**Competition**
**Good****53%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Avg price**
**Okay****$9.99**
avg listing price — sweet spot $15–$100
**Price range**
**Okay****$5.44–$19.81**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Growth**
**Bad****-6.3%**
90-day search growth — must beat 0% to launch
**Market size**
**Bad****$69K**
$69K/yr · 76K searches
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%") [** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500")
According to Flapen's Amazon United States niche tracking, 3.7v battery charger is a $69K/yr Amazon United States market (76K searches/yr). The top 5 brands hold 58% of demand. Demand peaks in Oct–Nov–Dec. Verdict: Worth a look — 50/100.
Data updated Jul 22, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **3.7v battery charger market data**
- **Units sold / yr**
- **5K–6K**
- avg 100–250/product
- **Revenue / yr**
- **$50K–$60K**
- units × avg price
- **Conversion rate**
- **9.1%**
- **Avg BSR**
- **#23**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **89%**
- **Out of stock**
- **3.1%**
- **Avg brand age**
- **36 months**
- **Avg seller age**
- **189 days**
## **Competition & brand share**
The top 5 products take 53% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**20 **▲rising
**Sellers**
**22**
**Top-5 brand share**
**58%**
Top 20: 100%
**Top-5 click share**
**53%**
Top 20: 93%
**Open market**
**36%**
- Tosiicop16% - TRAELY13% - Blomiky11% - Tokeyla11% - Jomi & Jolly7% - VGGUBKZ6%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -6.3% search growth over the last 90 days.
3K2KSpike '24Prime Day '25Spike '25 seasonSepDecMarJunAugNovMarMay
Peak months: Oct, Nov, Dec · busiest ÷ quietest = 1.8×
[**Open Trend **](https://flapen.com/research/us/electronics/3-7v-battery-charger/trend)
## **Top 3.7v battery charger search terms**
- **3.7v battery charger**27K/yr-8.2%6.4% conv. - **3.7v charger**13K/yr+37.8%5.4% conv. - **3.7 volt battery charger**16K/yr-21.9%6.1% conv. - **3.7 v battery charger**5K/yr-4.6%6.1% conv. - **3.7 volt rechargeable battery charger**4K/yr-20.0%9.3% conv. - **3.7 battery charger**3K/yr-1.0%7.3% conv. - **3.7v lithium battery charger**3K/yr-24.3%6.6% conv. - **3.7v lithium ion battery 18650 charger**3K/yr-35.1%5.5% conv. [**All search terms **](https://flapen.com/research/us/electronics/3-7v-battery-charger/search-terms)
## **Top 3.7v battery charger 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%$3K8%$6K12%$8K16%$11K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Tosiicop 3.7V Lipo Battery Charger - SM-2P Cable RC Toy Remote Control Car Vehicle Rechargeable Li-ion Batteries Chargers USB for Bunch Bubble Gun Stunt Truck Boat 2 Pack**Tosiicop**$5.90**4.5★197 rev](https://www.amazon.com/dp/B0DGTM28XH) [2**Blomiky 2 Pack 3.7V 0.5A Lithium Battery Charge Cable with SM-2P Black Plug for Some Kind of Mini RC Amphibious Stunt Car Boat Trucks 1S Li-ion and Li-Po Battery / 3.7V USB 2**Blomiky**$6.37**4.5★901 rev](https://www.amazon.com/dp/B08X4PNY6V) [3**18650 Battery Charger 4 Bay Smart Universal Charger for 3.7V Rechargeable Lithium Li ion Batteries Compatible 18650 26650 21700 10400 14500 16340 16650 18500 Battery Charger (Only USB Charger)**Tokeyla**$8.97**4.4★1,448 rev](https://www.amazon.com/dp/B08XQSSRZK) [4**18650 Battery Charger Single-Slot Universal 3.7V Battery Charger for 18650 21700 26650 14500 16340 Li-ion Rechargeable Batteries**TRAELY**$6.92**4.4★61 rev](https://www.amazon.com/dp/B0FRF6VNWL) [5**2 Pack 3.7V 500mAh Rechargeable Batteries with Dual Protection and USB Charger Cables SM-2P plug Design Universally Compatible with Various Remote Control Cars Trucks Stunts and RC Toys**Jomi & Jolly**$9.72**4.5★220 rev](https://www.amazon.com/dp/B0DF5CT6GG)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**2 Pack 3.7V Lithium Battery Charger Cable 3.7 Volt USB Charger Cable with SM-2P Plug for RC Car Battery Mini RC Cars Boats Trucks Toys**VGGUBKZ**$5.44**35 rev4mo ago](https://www.amazon.com/dp/B0GTLK3SGK) [**18650 Battery Charger 4 Bay 3.7V Li-ion Battery Charger with Smart LCD Display 2A Fast Charging for Rechargeable Batteries Lithium NI-MH NI-Cd AA AAA C 18650 18350 18700 21700 26650 14500 16340**WANGDAJIEDIAN**$19.48**470 rev4mo ago](https://www.amazon.com/dp/B0GT95JS7D) [**EBL Smart 18650 Battery Charger for Rechargeable 3.7V/3.6V Li-ion IMR Batteries 26650 18650 21700 14500 16340(RCR123) Ni-MH/Ni-Cd AA AAA C Batteries**EBL**$9.96**139 rev8mo ago](https://www.amazon.com/dp/B0G1M8ZNZZ) [**EBL 18650 Battery Charger Universal Lithium Charger for 3.7V Rechargeable Batteries Li-ion IMR 10440 14500 16340 18650 RCR123A Batteries**EBL**$9.31**64 rev8mo ago](https://www.amazon.com/dp/B0FYCN3J88) [**Tosiicop 3.7V Lipo Battery Charger - 2 PCS 1S Lipo JST Charger Cable with USB JST 2 Pin Plug for RC Car Battery Remote Control Toys Airplane FPV Boat Tank Helicopter**Tosiicop**$5.69**12 rev9mo ago](https://www.amazon.com/dp/B0FVXYHM2Y)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**2 Pack 3.7V Lithium Battery Charger Cable 3.7 Volt USB Charger Cable with SM-2P Plug for RC Car Battery Mini RC Cars Boats Trucks Toys**VGGUBKZ**$5.44**4.5★**▲ 192%**](https://www.amazon.com/dp/B0GTLK3SGK) [**18650 Battery Charger 2 Bay Rechargeable Batteries Charger with Smart LCD Display Fast Charging for AA/AAA Ni-MH/Ni-Cd 3.7V Li-ion Batteries IMR/INR/ICR 18650 21700 17500 14500 26650 21750 26650**WANGDAJIEDIAN**$12.69**4.3★**▲ 191%**](https://www.amazon.com/dp/B0GXFMKM4F) [**18650 Battery Charger 4 Bay 3.7V Li-ion Battery Charger with Smart LCD Display 2A Fast Charging for Rechargeable Batteries Lithium NI-MH NI-Cd AA AAA C 18650 18350 18700 21700 26650 14500 16340**WANGDAJIEDIAN**$19.48**4.3★**▲ 191%**](https://www.amazon.com/dp/B0GT95JS7D) [**UpBright 3.7V AC/DC Adapter Compatible with LUMINAR Work Item 61777 61960 60793 Harbor Freight 3 Watt 3W 120 LED Rechargeable Cordless Spotlight 1300mAh Power Supply Cord Cable PS Battery Charger PSU**UPBRIGHT**$10.83**4.4★**▲ 139%**](https://www.amazon.com/dp/B09VBZSBM6) [**Tosiicop 3.7V Lipo Battery Charger - 2 PCS 1S Lipo JST Charger Cable with USB JST 2 Pin Plug for RC Car Battery Remote Control Toys Airplane FPV Boat Tank Helicopter**Tosiicop**$5.69**4.4★**▲ 57%**](https://www.amazon.com/dp/B0FVXYHM2Y)
**~~View all trending →~~**
## **What buyers say about 3.7v battery charger**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Charging**32%
*“Charges quickly”*
**Battery Life**14%
*“The Li-ion battery works great”*
**Advertised Vs Actual Product**13%
*“As advertised”*
**Value For Money**11%
*“Great value”*
**Quality-Overall**8%
*“As described, appears to be well made”*
**Ease Of Use**5%
*“Easy to use”*
**Size-Overall**2%
*“Perfect fit for lightsabers”*
**Efficiency**1%
*“Worked perfectly”*
**Portability**1%
*“it's great for travel”*
**Compatibility-Overall**1%
*“Perfectly compatible with my water guns”*
### **What buyers complain about **
**Charging**38%
*“Slow charging”*
**Functionality-Overall**9%
*“Don't work good”*
**Quality-Overall**7%
*“Garbage”*
**Durability**5%
*“This product only worked one time”*
**Battery Life**5%
*“Takes forever to charge batteries”*
**Compatibility-Overall**3%
*“Didn't work for my Mactools Flashlight”*
**Size-Overall**3%
*“it's small and only a matter of time before I misplace it”*
**Heating**2%
*“Gets a little warm”*
**Advertised Vs Actual Product**2%
*“Fake ad”*
**Flammable**1%
*“likely would have caused a fire”*
### **Top return reasons **
**Charging**36%
**Size-Overall**16%
**Compatibility-Overall**13%
**Battery Inclusion**13%
**Functionality-Overall**6%
**Advertised Vs Actual Product**4%
**Defective Material/Parts**2%
**Battery Life**2%
**Socket/Port/Plug**1%
**Connectivity-Overall**1%
## **Common questions**
- **Is 3.7v battery charger profitable to sell on Amazon United States?**
- The niche generates $69K/yr across 27 tracked products. 6 of 8 products launched in the last 360 days are still selling. 90-day search growth is -6.3%. Flapen's verdict: Worth a look (50/100).
- **How competitive is the 3.7v battery charger niche?**
- 20 brands and 22 sellers compete. The top 5 products take 53% of clicks and top 5 brands hold 58% of demand.
- **What do buyers complain about in 3.7v battery charger?**
- Top complaints mined from reviews: Charging, Functionality-Overall, Quality-Overall. The return rate is 2.2%.
- **When does demand for 3.7v battery charger peak?**
- Demand peaks in Oct–Nov–Dec; the busiest month runs 1.8× the quietest.
- **What does it cost to enter the 3.7v battery charger niche?**
- Listings span $5.44–$19.81; the average listing price is $9.99 (sweet spot $15–$100). The average incumbent carries 384 reviews — the moat a new listing must climb.
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