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51

bl1830b

Worth a look

Shows a $13.0M/yr market, but pricing outside the sweet spot ($6129.36 avg) keeps it on the watch list.

Market size 100Growth 32Conversion 48Competition 14Returns 97Price range 0Avg price 0Brand share 16Review moat 74Quality gap 94

Market size

Incredible¥13.0M

¥13.0M/yr · 55K searches

Returns

Incredible0.7%

return rate — above 5% kills the launch gate

Quality gap

Great4.0★

avg incumbent rating — lower means beatable quality

Review moat

Good522.2

avg incumbent reviews — the moat a new listing must climb

Conversion

Okay3.9%

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

Growth

Okay+5.7%

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

Brand share

Bad94%

top-5 brand share — brand-locked demand

Competition

Bad83%

top-5 click share — a locked-up shelf

Avg price

Bad¥6129.36

avg listing price — sweet spot $15–$100

Price range

Bad¥2134.88–¥14066.46

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

According to Flapen's Amazon Japan niche tracking, bl1830b is a ¥13.0M/yr Amazon Japan market (55K searches/yr). The top 5 brands hold 94% of demand. Demand peaks in Jul. Verdict: Worth a look — 51/100.

Data updated Jul 31, 2026 · scored weekly · How we score niches

bl1830b market data

Units sold / yr
2K–3K
avg 100–250/product
Revenue / yr
¥12.3M–¥15.3M
units × avg price
Conversion rate
3.9%
Avg BSR
#206
Page quality
0%
Prime
100%
Sponsored
80%
Out of stock
0.0%
Avg brand age
31 months
Avg seller age
143 days

Competition & brand share

The top 5 products capture 83% of clicks — a locked-up shelf that new listings rarely crack.

Brands

7 flat

Sellers

214

Top-5 brand share

94%

Top 20: 100%

Top-5 click share

83%

Top 20: 100%

Open market

3%

  • Makita(マキタ)63%
  • §VANKO17%
  • SHIBASHO6%
  • Saikyoubat4%
  • Amoresbat4%
  • Fukata3%
  • Open — no brand owns it (1 brand, 3%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +5.7% search growth over the last 90 days.
2K1KHoliday '24Prime Day '25Black Friday '25Spike '26Prime Day '26SepDecMarJunAugNovMarMay

Peak months: Jul · busiest ÷ quietest = 1.6×

Top bl1830b search terms

  • bl1830b22K/yr
  • bl1830b マキタ 純正バッテリー3K/yr
  • bl1820b6K/yr
  • bl18306K/yr
  • マキタ 18v バッテリー 3ah4K/yr
  • マキタ bl1830b3K/yr
  • bl1815n3K/yr
  • マキタ 18v バッテリー 3.0ah3K/yr
  • bl1830b マキタ 純正4K/yr
All search terms

Top bl1830b 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%15%¥2.0M30%¥3.9M45%¥5.9M60%¥7.8M1101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 10 tracked products in this niche — three views at once, no toggling.

What buyers say about bl1830b

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

What buyers love

充電14%

“1回の充電で長時間使えます。”

コストパフォーマンス12%

“低価格”

バッテリーの内蔵11%

“マキタやほかの互換バッテリーはこのバッテリーには廉価とデザインが優れています。”

総合品質9%

“高コスパ. ☆4・・・よい品である.”

使用の容易さ7%

“説明書は英語のみですが読まなくても使えるので問題はない。”

耐久性7%

“耐久性ですね。”

互換性-全体5%

“問題なく使えています。 マキタの純正品のインパクトレンチにも互換品のインパクトドライバー等にも問題なく使えました。”

軽い4%

“サイズも重さもバッチリですね”

セキュリティ3%

“安心感がちがいますね”

広告と実際の製品の違い3%

“想定通り”

What buyers complain about

充電27%

“充電できません”

バッテリーの内蔵11%

“外せないバッテリー”

コストパフォーマンス10%

“11,000円も請求し領収しながら全く信じられない。”

耐久性10%

“壊れた”

商品の状態5%

“新品なのにガッカリです。”

総合品質4%

“また、制御基板は防水コートされておらず、温度センサもセルにつけるものではないのでかなり質が悪いと感じます.”

使用説明書/ユーザーマニュアル/トラブルシューティング3%

“本バッテリーについてきたのは英語/ドイツ語の取り扱い説明書のみで、日本語のものはありませんでした。”

重い2%

“重い”

互換性-全体2%

“互換性が全くありません。”

清掃の容易さ1%

“とにかく汚い”

Top return reasons

充電39%
商品の状態13%
互換性-全体11%
サイズ全体8%
機能全体4%
バッテリーの内蔵4%
不良材料/部品3%
広告と実際の製品の違い2%
総合品質2%
タッチ/ボタンコントロール2%

Common questions

Is bl1830b profitable to sell on Amazon Japan?
The niche generates ¥13.0M/yr across 10 tracked products. 3 of 3 products launched in the last 360 days are still selling. 90-day search growth is +5.7%. Flapen's verdict: Worth a look (51/100).
How competitive is the bl1830b niche?
7 brands and 214 sellers compete. The top 5 products take 83% of clicks and top 5 brands hold 94% of demand.
What do buyers complain about in bl1830b?
Top complaints mined from reviews: 充電, バッテリーの内蔵, コストパフォーマンス. The return rate is 0.7%.
When does demand for bl1830b peak?
Demand peaks in Jul; the busiest month runs 1.6× the quietest.
What does it cost to enter the bl1830b niche?
Listings span ¥2134.88–¥14066.46; the average listing price is ¥6129.36 (sweet spot $15–$100). The average incumbent carries 522 reviews — the moat a new listing must climb.