---
title: "Products — 21700 battery - Flapen"
canonical_url: "https://flapen.com/research/uk/electronics-photo/21700-battery/products"
last_updated: "2026-07-31T08:52:12.639Z"
locale: en
meta:
  description: "Niche score 40/100 · £26K/yr market · 65K searches/yr · £14.80 avg price. Doesn't clear our bar today. Data updated Jul 2026."
  "og:description": "Niche score 40/100 · £26K/yr market · 65K searches/yr · £14.80 avg price. Doesn't clear our bar today. Data updated Jul 2026."
  "og:title": "Products — 21700 battery - Flapen"
---

# **21700 battery**

**Skip it**

A small market ($26K/yr) — this niche doesn't clear our bar today.

Market size 7Growth 18Conversion 34Competition 19Returns 95Price range 36Avg price 73Brand share 10Review moat 98Quality gap 96

**Review moat**

**Incredible****41**

avg incumbent reviews — the moat a new listing must climb

**Quality gap**

**Incredible****3.9★**

avg incumbent rating — lower means beatable quality

**Returns**

**Incredible****1.0%**

return rate — above 5% kills the launch gate

**Avg price**

**Good****£14.80**

avg listing price — sweet spot $15–$100

**Price range**

**Okay****£5.23–£20.40**

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

**Conversion**

**Okay****2.8%**

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

**Competition**

**Bad****78%**

top-5 click share — a locked-up shelf

**Growth**

**Bad****-13.9%**

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

**Brand share**

**Bad****96%**

top-5 brand share — brand-locked demand

**Market size**

**Bad****£26K**

£26K/yr · 65K searches

**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=uk&signal=low_review_barrier "Top brand's reviews < 500") [** Quality Gap**](https://flapen.com/research/niches?market=uk&signal=quality_gap "Avg rating < 4.0")