21700 battery charger
Skip itSoft demand (-23.4% this quarter) — this niche doesn't clear our bar today.
Avg price
Incredible$30.94avg listing price — sweet spot $15–$100
Price range
Great$9.82–$98.38cheapest to priciest tracked listing — scored on the share inside $15–$100
Returns
Great1.7%return rate — above 6% kills the launch gate
Review moat
Good610.36avg incumbent reviews — the moat a new listing must climb
Conversion
Good6.6%search→purchase rate — share of searches ending in a sale
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Market size
Okay$183K$183K/yr · 90K searches
Competition
Okay63%top-5 click share — leaders hold, buyers still browse
Brand share
Okay89%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.
All 25 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
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$19.774.6★1,552 rev
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$38.284.5★1,233 rev
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$38.374.6★122 rev
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$28.884.2★107 rev
21750 21700 Battery Charger LCD Intelligent 18650 Battery Charger for 20700 22700 26650 26700 16340 (RCR123) 17670 Rechargeable Battery with PCB Protection Board
FUGASUN$13.584.5★3,869 rev
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)
MLKJHZ$9.8236 rev
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$9.9363 rev
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$63.3295 rev
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$12.93201 rev
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$39.09193 rev
Trending
90-day click momentum18650 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$9.824.3★
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$44.654.3★
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$29.164.4★
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$9.934.6★
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$28.884.2★
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -23.4% search growth over the last 90 days.Peak months: Jan, Dec · busiest ÷ quietest = 1.8×
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“Charges good”
“Long lasting under constant daily use”
“Build quality is excellent”
“Just as advertised”
“Value for the money”
“Easy to use”
“much lighter than my other power bank”
“Long lasting under constant daily use”
“Works flawlessly”
“Overall, the design appears compact and technically advanced on my desk”
What buyers complain about
“Wont charge”
“Fails every few months”
“even though the battery is dead”
“Low quality”
“Very small”
“contrary to Product Information”
“Did not work”
“AA and AAA don't fit”
“which is the one that I have has gone up $20 since I bought mine”
“I couldnt fully figure out how to use it”