21700 Battery
MaybeProducts sell for $22.47 on average, inside the sweet spot. But buyers convert on only 1.2% of searches, so 21700 Battery is a Maybe.
- Flapen Score
- 54 / 100Top 11% of 8,347 Electronics niches · +11 vs the category median of 4354
- Market size
- $72K/yr277K searches / yr
- 90-day growth
- +7.0%search demand this quarter
- Competition
- 55%top-5 click share · 21 brands · 23 sellers
Flapen Score
21700 Battery against its category
The dotted line is the Electronics average. Past it, 21700 Battery is stronger. Inside it, weaker.
Market
The 21700 Battery market on Amazon at a glance
Shoppers on Amazon United States searched for 21700 Battery 277K times last year and spent an estimated $72K. The top 5 brands take 61% of clicks. Flapen scores it 54 out of 100, a Maybe.
01 · Demand
An estimated 1.2% of those searches ended in a purchase.
Shoppers searched for this 277K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 1.2% of those searches ended in a purchase. Searches in the last 90 days moved +7.0% against the 90 days before. Searches, conversion and average price together put the market at an estimated $72K a year.
- Searches, last 12 months
- 277K
- Growth, 90 days vs prior 90
- +7.0%
- Conversion, latest week
- 1.2%
- Market size, estimated
- $72Ka year
- Peak month
- December1.2× the quietest month
- Top search term
- 21700 battery166K searches a year
02 · Price
A sale here is worth $22.47.
Listings sell for $22.47 on average, from $9.01 to $67.48. Amazon reports units sold in ranges. This niche sold 10K to 13K a year. The average listing sells 250 to 500 of them. At $22.47 that is $6K to $11K a year per listing.
- Average price
- $22.47inside the $15 to $100 sweet spot
- Price range
- $9.01–$67.48
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 10K–13K
- Units per listing a year
- 250–500
- Revenue per listing a year
- $6K–$11K
- Returns
- 1.2%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is low.
81% of listings pay for placement with sponsored ads. 85% ship with Prime. On an average day, 6.4% of listings are out of stock. The average listing ranks #3,989 within Household Batteries, Chargers & Accessories. It carries 405 reviews at 4.21 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 81%
- Prime listings
- 85%
- Out of stock, average day
- 6.4%
- Average rank
- #3,989in Household Batteries, Chargers & Accessories
- Average rating
- 4.21 starsAmazon United States average 4.42 stars
- Average reviews
- 405per listing
- Listings tracked
- 27
04 · Newcomers
0 of last year's 11 launches cleared the first-year sales bar.
11 products launched here in the last 12 months. 0 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 34 months on average, so a newcomer is not facing entrenched names.
- Launched, last 12 months
- 11
- Successful launches
- 0Amazon's first-year sales bar
- Average brand age
- 34 months
Products
Top 21700 Battery products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 22, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
BFHB 21700 Battery Case Compact Durable TPU Organizer for Travel Flashlights & Everyday Carry2-Pack
- Price
- $18.76
- Rating
- 4.3/5
- Reviews
- 9
- Age
- 1mo ago
2-Slot Battery Charger Flap Top Set for Flashlights Universal 3.7V Li-ion Batteries Charger for 18650 26650 21700(No Suitable for nimh and 1.5V Batteries)
- Price
- $19.33
- Rating
- 4.7/5
- Reviews
- 12
- Age
- 4mo ago
2-Slot 21700 Battery Charger Set 2pcs 5000mAh Button Top Universal 3.7V Li-ion Batteries Charger for Doorbells Flashlights Headlamps Cameras Toys(No Suitable for nimh & Other 1.5V Batteries)
- Price
- $23.07
- Rating
- 4.5/5
- Reviews
- 11
- Age
- 2y ago
18650 to 21700 Battery Adapter Converter Adapter for 21700 Flashlight Cases with Metal Contacts 18650 Sleeve Batteries Protective 21700 Battery Adaptor Holder Accessories (2 Battery Converters)
- Price
- $14.97
- Rating
- 4.2/5
- Reviews
- 74
- Age
- 3y ago
Protect Your Power - Slimline 21700 Battery Case Compact Durable TPU Organizer for Travel Flashlights & Everyday Carry 2-Pack (Holds 2 Batteries)
- Price
- $16.93
- Rating
- 4.6/5
- Reviews
- 250
- Age
- 4y ago
Trending
estimated 90-day click momentum
XONBDNOX 217 Rechargeable Battery Case Set 2-Pack: 5000mAh High-Capacity 3.6V 217 Flat-Top Batteries Suitable for flashlights headlamps and More.
- Price
- $19.45
- Rating
- 4.4/5
- Reviews
- 7
- Age
- 3mo ago
2-Slot Battery Charger Flap Top Set for Flashlights Universal 3.7V Li-ion Batteries Charger for 18650 26650 21700(No Suitable for nimh and 1.5V Batteries)
- Price
- $19.33
- Rating
- 4.7/5
- Reviews
- 12
- Age
- 4mo ago
BFHB 21700 Battery Case Compact Durable TPU Organizer for Travel Flashlights & Everyday Carry2-Pack
- Price
- $18.76
- Rating
- 4.3/5
- Reviews
- 9
- Age
- 1mo ago
2-Slot 21700 Battery Charger Set 2pcs 5000mAh Button Top Universal 3.7V Li-ion Batteries Charger for Doorbells Flashlights Headlamps Cameras Toys(No Suitable for nimh & Other 1.5V Batteries)
- Price
- $23.07
- Rating
- 4.5/5
- Reviews
- 11
- Age
- 2y ago
FITHOOD Battery Replacement for Welch-Allyn 21700 11720 71050 11730 71051 18200 74054 71022 71150 WA-72200 71055 74710 71054 78904586 (750mAh/3.6V)
- Price
- $27.97
- Rating
- 3.9/5
- Reviews
- 4
- Age
- 6y ago
Newest
by launch dateBFHB 21700 Battery Case Compact Durable TPU Organizer for Travel Flashlights & Everyday Carry2-Pack
- Price
- $18.76
- Rating
- 4.3/5
- Reviews
- 9
- Age
- 1mo ago
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)
- Price
- $9.72
- Rating
- 4.3/5
- Reviews
- 42
- Age
- 3mo ago
XONBDNOX 217 Rechargeable Battery Case Set 2-Pack: 5000mAh High-Capacity 3.6V 217 Flat-Top Batteries Suitable for flashlights headlamps and More.
- Price
- $19.45
- Rating
- 4.4/5
- Reviews
- 7
- Age
- 3mo ago
2-Slot Battery Charger Flap Top Set for Flashlights Universal 3.7V Li-ion Batteries Charger for 18650 26650 21700(No Suitable for nimh and 1.5V Batteries)
- Price
- $19.33
- Rating
- 4.7/5
- Reviews
- 12
- Age
- 4mo ago
ABCTOY 6 Pack 3.7V 9900 mAh Rechargeable Battery Flat Top Upgrade Capacity Batteries for Flashlights Solar Lights Headlamp Remote Control
- Price
- $23.81
- Rating
- 3.3/5
- Reviews
- 20
- Age
- 5mo ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 55% of clicks. Leaders hold, but buyers still shop past them.
Brands
21 rising
Sellers
23
Est. top-5 brand share
61%
Top 20: 99%
Est. top-5 click share
55%
Top 20: 93%
Open market
32%
- MLKJHZ15%
- BFHB15%
- Sinyeeho13%
- DIVTEK10%
- OLIGHT9%
- Protect Your Power7%
Demand
21700 Battery search demand
Weekly searches over the year, seasonality beneath. Pick a range.
No pronounced peak months · busiest ÷ quietest = 1.2×
Search terms
Top 21700 Battery search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- 21700 battery166K/yr
- 21700 rechargeable battery46K/yr
- 2170022K/yr
- 21700 battery 5000mah11K/yr
- 21700 batteries6K/yr
- olight 21700 battery 5000mah 3.6v4K/yr
- 21700 battery samsung5K/yr
- 20700 battery5K/yr
- 21700 flat top battery4K/yr
- olight 21700 battery5K/yr
Reviews and returns
What reviews say buyers love and hate about 21700 Battery
We read the reviews and the return reasons for every product selling here.
“Useless charger”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
17 topics
Keep looking
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Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common 21700 Battery questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data