---
title: "21700 battery charger — Niche Verdict: Skip it (49/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/automotive/21700-battery-charger"
last_updated: "2026-07-14T03:48:36.500Z"
locale: en
meta:
  description: "soft demand (-23.4% this quarter) — 21700 battery charger doesn't clear our bar today."
  "og:description": "soft demand (-23.4% this quarter) — 21700 battery charger doesn't clear our bar today."
  "og:title": "21700 battery charger — Niche Verdict: Skip it (49/100) | Amazon United States - Flapen"
---

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# **21700 battery charger**

**Skip it**

Soft demand (-23.4% this quarter) — this niche doesn't clear our bar today.

Market size 37Growth 13Conversion 71Competition 36Returns 81Price range 90Avg price 95Brand share 27Review moat 72Quality gap 52

**Avg price**

**Incredible****$30.94**

avg listing price — sweet spot $15–$100

**Price range**

**Great****$9.82–$98.38**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Returns**

**Great****1.7%**

return rate — above 6% kills the launch gate

**Review moat**

**Good****610.36**

avg incumbent reviews — the moat a new listing must climb

**Conversion**

**Good****6.6%**

search→purchase rate — share of searches ending in a sale

**Quality gap**

**Good****4.4★**

avg incumbent rating — lower means beatable quality

**Market size**

**Okay****$183K**

$183K/yr · 90K searches

**Competition**

**Okay****63%**

top-5 click share — leaders hold, buyers still browse

**Brand share**

**Okay****89%**

top-5 brand share — brands hold most of the demand

**Growth**

**Bad****-23.4%**

90-day search growth — must beat 0% to launch

## **Competition**

The top 5 products take 63% of clicks — established leaders, but buyers still shop beyond them.

**Brands**

**11 **▲rising

**Sellers**

**16**

**Top-5 brand share**

**89%**

**Open market**

**8%**

- Nitecore58% - Imren17% - FUGASUN7% - XTAR5% - EdisonBright3% - SUNLYTOUR2% - Open — no brand owns it (5 brands, 8%)

## **Product shelf**

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%5%$9K10%$18K15%$27K20%$37K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 25 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![IMREN 18650 Battery Charger 21700 Battery Charger for 3.7V 14500 10400 18500 18350 18650 18700 20700 21700 22650 26650 Li-ion Battery 1.2V Ni-MH/Ni-Cd Battery 4 Bay 18650 USB C Charger](https://m.media-amazon.com/images/I/416PtJGBkIL.jpg)**IMREN 18650 Battery Charger 21700 Battery Charger for 3.7V 14500 10400 18500 18350 18650 18700 20700 21700 22650 26650 Li-ion Battery 1.2V Ni-MH/Ni-Cd Battery 4 Bay 18650 USB C Charger**Imren**$19.77**4.6★1,552 rev](https://www.amazon.com/dp/B094C6GDT2) [2![Nitecore UMS4 Intelligent USB-C Four Slot Quick Battery Charger for Li-Ion/Ni-MH/Ni-Cd/IMR 16340 14500 18650 21700 20700 AA AAA and More Batteries with Organizer](https://m.media-amazon.com/images/I/411qXxBP9XL.jpg)**Nitecore UMS4 Intelligent USB-C Four Slot Quick Battery Charger for Li-Ion/Ni-MH/Ni-Cd/IMR 16340 14500 18650 21700 20700 AA AAA and More Batteries with Organizer**Nitecore**$38.28**4.5★1,233 rev](https://www.amazon.com/dp/B07JPL476H) [3![NITECORE UMS4 Intelligent QC 4-Slot Quick Battery Charger for Li-Ion/IMR/LiFePO4/Ni-MH/Ni-Cd 14500 16340 18350 18650 20700 21700 AA AAA with NITECORE Tag](https://m.media-amazon.com/images/I/41Pu8aJap2L.jpg)**NITECORE UMS4 Intelligent QC 4-Slot Quick Battery Charger for Li-Ion/IMR/LiFePO4/Ni-MH/Ni-Cd 14500 16340 18350 18650 20700 21700 AA AAA with NITECORE Tag**Nitecore**$38.37**4.6★122 rev](https://www.amazon.com/dp/B07TX4TYYB) [4![NITECORE UMS2 Intelligent QC Dual-Slot Quick Battery Charger for Li-Ion/IMR/LiFePO4/Ni-MH/Ni-Cd 14500 16340 18350 18650 20700 21700 AA AAA with NITECORE Tag](https://m.media-amazon.com/images/I/41eOZxNfCVL.jpg)**NITECORE UMS2 Intelligent QC Dual-Slot Quick Battery Charger for Li-Ion/IMR/LiFePO4/Ni-MH/Ni-Cd 14500 16340 18350 18650 20700 21700 AA AAA with NITECORE Tag**Nitecore**$28.88**4.2★107 rev](https://www.amazon.com/dp/B0C77KK1HN) [5![21750 21700 Battery Charger LCD Intelligent 18650 Battery Charger for 20700 22700 26650 26700 16340 (RCR123) 17670 Rechargeable Battery with PCB Protection Board](https://m.media-amazon.com/images/I/41+1A1xGeOL.jpg)**21750 21700 Battery Charger LCD Intelligent 18650 Battery Charger for 20700 22700 26650 26700 16340 (RCR123) 17670 Rechargeable Battery with PCB Protection Board**FUGASUN**$13.58**4.5★3,869 rev](https://www.amazon.com/dp/B0B5V7VC2W)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![18650 Battery Charger 2 Bay LCD Display Universal Charger for 3.7V/3.6V Li-ion Batteries 26650 21700 18650 16340(RCR123) 14500 10400 1.2V Ni-MH/Ni-Cd AA AAA Batteries(Battery not Included)](https://m.media-amazon.com/images/I/41wZ9j8u-cL.jpg)**18650 Battery Charger 2 Bay LCD Display Universal Charger for 3.7V/3.6V Li-ion Batteries 26650 21700 18650 16340(RCR123) 14500 10400 1.2V Ni-MH/Ni-Cd AA AAA Batteries(Battery not Included)**MLKJHZ**$9.82**36 rev3mo ago](https://www.amazon.com/dp/B0GVBQ79HV) [![18650 Battery Charger for 3.7V/3.6V Li-ion Batteries 26650 18650 21700 14500 16340(RCR123) Ni-MH/Ni-Cd AA AAA C Batteries-Upgraded](https://m.media-amazon.com/images/I/31MSqodqYXL.jpg)**18650 Battery Charger for 3.7V/3.6V Li-ion Batteries 26650 18650 21700 14500 16340(RCR123) Ni-MH/Ni-Cd AA AAA C Batteries-Upgraded**TRAELY**$9.93**63 rev9mo ago](https://www.amazon.com/dp/B0FRFZGZW8) [![Nitecore NB Plus 10 000mAh Power Bank Ultra Lightweight and Slim USB-C and USB-A Ports for Phones iPads and More Travel Ready Fast Charging 5V/3A QC PD](https://m.media-amazon.com/images/I/410KVFnO-QL.jpg)**Nitecore NB Plus 10 000mAh Power Bank Ultra Lightweight and Slim USB-C and USB-A Ports for Phones iPads and More Travel Ready Fast Charging 5V/3A QC PD**Nitecore**$63.32**95 rev11mo ago](https://www.amazon.com/dp/B0FLT6TQ77) [![18650 Battery Charger LCD Display Charger for 3.7V Li-ion Battery 18650 26650 21700 18500 18350 16650 1.2V LiFePO4 Ni-MH Ni-Cd A AA AAA Rechargeable Batteries(Battery not Included)](https://m.media-amazon.com/images/I/419KTosb6VL.jpg)**18650 Battery Charger LCD Display Charger for 3.7V Li-ion Battery 18650 26650 21700 18500 18350 16650 1.2V LiFePO4 Ni-MH Ni-Cd A AA AAA Rechargeable Batteries(Battery not Included)**Swanlake**$12.93**201 rev1y ago](https://www.amazon.com/dp/B0DN1CN8XQ) [![18650 Battery Charger MIEKLALE 8+2 Bays Smart Universal Battery Charger with LCD Display for Rechargeable Batteries Li-ion LiFePO4 RCR123 16340 26650 10440 14500 & 9V NiMH NiCd AAA AA(8+2Slots)](https://m.media-amazon.com/images/I/51g-XS0z0HL.jpg)**18650 Battery Charger MIEKLALE 8+2 Bays Smart Universal Battery Charger with LCD Display for Rechargeable Batteries Li-ion LiFePO4 RCR123 16340 26650 10440 14500 & 9V NiMH NiCd AAA AA(8+2Slots)**MIEKLALE**$39.09**193 rev1y ago](https://www.amazon.com/dp/B0DK79PHD9)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![18650 Battery Charger 2 Bay LCD Display Universal Charger for 3.7V/3.6V Li-ion Batteries 26650 21700 18650 16340(RCR123) 14500 10400 1.2V Ni-MH/Ni-Cd AA AAA Batteries(Battery not Included)](https://m.media-amazon.com/images/I/41wZ9j8u-cL.jpg)**18650 Battery Charger 2 Bay LCD Display Universal Charger for 3.7V/3.6V Li-ion Batteries 26650 21700 18650 16340(RCR123) 14500 10400 1.2V Ni-MH/Ni-Cd AA AAA Batteries(Battery not Included)**MLKJHZ**$9.82**4.3★**▲ 342%**](https://www.amazon.com/dp/B0GVBQ79HV) [![8 bays 21700 18650 Battery Charger XTAR New VC8 Plus 21700 Smart Charger with LCD Display 1A*8 Fast Charger for 3.6V 3.7V Li-ion 10440 18700 26650 1.2V Ni-MH AA AAA C Full Set with DC 12V 3A Adapter](https://m.media-amazon.com/images/I/41Elekzy2TL.jpg)**8 bays 21700 18650 Battery Charger XTAR New VC8 Plus 21700 Smart Charger with LCD Display 1A*8 Fast Charger for 3.6V 3.7V Li-ion 10440 18700 26650 1.2V Ni-MH AA AAA C Full Set with DC 12V 3A Adapter**XTAR**$44.65**4.3★**▲ 170%**](https://www.amazon.com/dp/B09H5K27JB) [![XTAR VC4SL Upgrade Version VC4S Smart Rechargeable Battery Charger Type C 4 Bay Fast 18650 Charger with LCD for 3.7V 3.6V Li-ion Battery 10440 14500 18650 21700 26650 and Ni-MH Ni-CD AA AAA](https://m.media-amazon.com/images/I/41lj+3At0WL.jpg)**XTAR VC4SL Upgrade Version VC4S Smart Rechargeable Battery Charger Type C 4 Bay Fast 18650 Charger with LCD for 3.7V 3.6V Li-ion Battery 10440 14500 18650 21700 26650 and Ni-MH Ni-CD AA AAA**XTAR**$29.16**4.4★**▲ 147%**](https://www.amazon.com/dp/B09MT1ZSKL) [![18650 Battery Charger for 3.7V/3.6V Li-ion Batteries 26650 18650 21700 14500 16340(RCR123) Ni-MH/Ni-Cd AA AAA C Batteries-Upgraded](https://m.media-amazon.com/images/I/31MSqodqYXL.jpg)**18650 Battery Charger for 3.7V/3.6V Li-ion Batteries 26650 18650 21700 14500 16340(RCR123) Ni-MH/Ni-Cd AA AAA C Batteries-Upgraded**TRAELY**$9.93**4.6★**▲ 103%**](https://www.amazon.com/dp/B0FRFZGZW8) [![NITECORE UMS2 Intelligent QC Dual-Slot Quick Battery Charger for Li-Ion/IMR/LiFePO4/Ni-MH/Ni-Cd 14500 16340 18350 18650 20700 21700 AA AAA with NITECORE Tag](https://m.media-amazon.com/images/I/41eOZxNfCVL.jpg)**NITECORE UMS2 Intelligent QC Dual-Slot Quick Battery Charger for Li-Ion/IMR/LiFePO4/Ni-MH/Ni-Cd 14500 16340 18350 18650 20700 21700 AA AAA with NITECORE Tag**Nitecore**$28.88**4.2★**▲ 72%**](https://www.amazon.com/dp/B0C77KK1HN)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 104 weeks — -23.4% search growth over the last 90 days.

3K2KHoliday '24Spike '25Black Friday '25 seasonSepDecMarJunAugNovMarMay

Peak months: Jan, Dec · busiest ÷ quietest = 1.8×

## **Reviews**

What buyers praise and complain about, mined from review topics.

### **What buyers love **

**Charging**37%

*“Charges good”*

**Battery Life**13%

*“Long lasting under constant daily use”*

**Quality-Overall**10%

*“Build quality is excellent”*

**Advertised Vs Actual Product**6%

*“Just as advertised”*

**Value For Money**5%

*“Value for the money”*

**Ease Of Use**4%

*“Easy to use”*

**Weight Light**2%

*“much lighter than my other power bank”*

**Durability**2%

*“Long lasting under constant daily use”*

**Efficiency**1%

*“Works flawlessly”*

**Design-Overall**1%

*“Overall, the design appears compact and technically advanced on my desk”*

### **What buyers complain about **

**Charging**37%

*“Wont charge”*

**Durability**8%

*“Fails every few months”*

**Battery Life**6%

*“even though the battery is dead”*

**Quality-Overall**5%

*“Low quality”*

**Size-Overall**3%

*“Very small”*

**Advertised Vs Actual Product**3%

*“contrary to Product Information”*

**Functionality-Overall**3%

*“Did not work”*

**Compatibility-Overall**3%

*“AA and AAA don't fit”*

**Value For Money**2%

*“which is the one that I have has gone up $20 since I bought mine”*

**Instructions/User Manual/Troubleshooting**2%

*“I couldnt fully figure out how to use it”*

### **Top return reasons **

**Charging**50%

**Functionality-Overall**6%

**Weight Heavy**5%

**Advertised Vs Actual Product**5%

**Battery Inclusion**5%

**Size-Overall**5%

**Defective Material/Parts**3%

**Battery Life**3%

**Value For Money**3%

**Compatibility-Overall**2%