---
title: "Products — 21700 battery - Flapen"
canonical_url: "https://flapen.com/research/us/electronics/21700-battery/products"
last_updated: "2026-08-11T07:28:39.088Z"
locale: en
meta:
  description: "Niche score 54/100 · $72K/yr market · 277K searches/yr · $22.47 avg price. Weak search conversion (1.2%) keeps it on the watch list. Data updated Jul 2026."
  "og:description": "Niche score 54/100 · $72K/yr market · 277K searches/yr · $22.47 avg price. Weak search conversion (1.2%) keeps it on the watch list. Data updated Jul 2026."
  "og:title": "Products — 21700 battery - Flapen"
---

# **21700 battery**

**Worth a look**

Shows a sweet-spot price point ($22.47 avg), but weak search conversion (1.2%) keeps it on the watch list.

Market size 18Growth 34Conversion 14Competition 50Returns 91Price range 87Avg price 94Brand share 73Review moat 80Quality gap 81

**Avg price**

**Great****$22.47**

avg listing price — sweet spot $15–$100

**Returns**

**Great****1.2%**

return rate — above 5% kills the launch gate

**Price range**

**Great****$9.01–$67.48**

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

**Quality gap**

**Great****4.2★**

avg incumbent rating — lower means beatable quality

**Review moat**

**Great****404.96**

avg incumbent reviews — the moat a new listing must climb

**Brand share**

**Good****61%**

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

**Competition**

**Okay****55%**

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

**Growth**

**Okay****+7.0%**

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

**Market size**

**Bad****$72K**

$72K/yr · 277K searches

**Conversion**

**Bad****1.2%**

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

**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%") [** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500")

## Products