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21v バッテリー

Maybe

The average product has only 39 reviews. But products sell for $3288.25 on average, outside the sweet spot, so 21v バッテリー is a Maybe.

Flapen Score
55
55 / 100
Ranks 2,433 of 4,191 DIY・工具・ガーデン niches · −2 vs the category median of 57
Market size
¥4.1M/yr56K searches / yr
90-day growth
+4.7%search demand this quarter
Competition
53%top-5 click share · 10 brands · 14 sellers

Flapen Score

21v バッテリー against its category

The dotted line is the DIY・工具・ガーデン average. Past it, 21v バッテリー is stronger. Inside it, weaker.

55Maybe
Big MarketTrendingHigh ConversionOpen MarketLow ReturnsPrice rangeAvg priceNo Dominant BrandLow Review BarrierQuality Gap
This niche Category average

Market

The 21v バッテリー market on Amazon at a glance

Shoppers on Amazon Japan searched for 21v バッテリー 56K times last year and spent an estimated ¥4.1M. The top 5 brands take 87% of clicks. Demand peaks in Dec. Flapen scores it 55 out of 100, a Maybe.

01 · Demand

An estimated 2.2% of those searches ended in a purchase.

Shoppers searched for this 56K times in the last 12 months. That counts every search on Amazon Japan for this niche's terms. An estimated 2.2% of those searches ended in a purchase. Searches in the last 90 days moved +4.7% against the 90 days before. Searches, conversion and average price together put the market at an estimated ¥4.1M a year.

Searches, last 12 months
56K
Growth, 90 days vs prior 90
+4.7%
Conversion, latest week
2.2%
Market size, estimated
¥4.1Ma year
Peak month
December1.6× the quietest month
Top search term
21v バッテリー17K searches a year

02 · Price

A sale here is worth ¥3288.25.

Listings sell for ¥3288.25 on average, from ¥1753.19 to ¥5500.13. Amazon reports units sold in ranges. This niche sold 750 to 1K a year. The average listing sells 0 to 100 of them. At ¥3288.25 that is ¥0 to ¥329K a year per listing.

Average price
¥3288.25above the $15 to $100 sweet spot
Price range
¥1753.19–¥5500.13
Amazon Japan median price
¥1942.07across 14,733 niches
Units sold a year
750–1K
Units per listing a year
0–100
Revenue per listing a year
¥0–¥329K
Returns
1.9%of orders · Amazon Japan median 0.4%

03 · Entry bar

The bar here is low.

75% of listings pay for placement with sponsored ads. 95% ship with Prime. On an average day, 29.6% of listings are out of stock. The average listing ranks #314 within 電動工具パーツ・アクセサリ. It carries 39 reviews at 3.89 stars, so a new listing needs social proof before a better product.

Sponsored listings
75%
Prime listings
95%
Out of stock, average day
29.6%
Average rank
#314in 電動工具パーツ・アクセサリ
Average rating
3.89 starsAmazon Japan average 4.15 stars
Average reviews
39per listing
Listings tracked
20

04 · Newcomers

10 of last year's 11 launches cleared the first-year sales bar.

11 products launched here in the last 12 months. 10 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 23 months on average, so a newcomer is not facing entrenched names.

Launched, last 12 months
11
Successful launches
10Amazon's first-year sales bar
Average brand age
23 months

Products

Top 21v バッテリー products & what they sell for

Every tracked product: its share of the shelf, its reviews, and its price.

Sign in to see the products

The products selling in this niche are for signed-in readers. Every market figure above stays open to everyone.

Competition

Competition: brands, sellers & click share

The top 5 products take 53% of clicks. Leaders hold, but buyers still shop past them.

Brands

10 rising

Sellers

14

Top-5 brand share

87%

Top 20: 100%

Top-5 click share

53%

Top 20: 100%

Open market

10%

  • Brand 133%
  • Brand 227%
  • Brand 311%
  • Brand 410%
  • Brand 55%
  • Brand 64%
  • Open — no brand owns it (4 brands, 10%)

Demand

21v バッテリー search demand

Weekly searches over the year, seasonality beneath. Pick a range.

1K750Spike '25Prime Day '25Holiday '25Spike '26DecJanFebMarAprMayJunJulAugSepOctNovDecJanFebMarAprMayJun

Peak months: Dec · busiest ÷ quietest = 1.6×

Search terms

Top 21v バッテリー search terms shoppers use

The exact words shoppers type, with yearly volume, growth, and conversion.

  • 21v バッテリー17K/yr
  • 21v バッテリー 互換13K/yr
  • マキタ 21v バッテリー7K/yr
  • マキタ互換バッテリー 21v5K/yr
  • マキタ バッテリー 21v4K/yr
  • バッテリー 21v4K/yr
  • seesii バッテリー3K/yr
  • マキタ 21v3K/yr

Reviews and returns

What reviews say buyers love and hate about 21v バッテリー

We read the reviews and the return reasons for every product selling here.

18%of positive reviews mention “コストパフォーマンス”
30%of negative reviews mention “充電”
1.9%of orders come back
“充電できない. 全く充電できず返品しました。”
A buyer, on “充電”30% of negative reviews mention the same topic

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.

18 topics

NegativePositive

FAQ

Common 21v バッテリー questions

Answered from the same tracked data.