---
title: "Battery Post Shims — $91K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/battery-post-shims"
last_updated: "2026-08-09T13:40:13.848Z"
locale: en
meta:
description: "Niche score 48/100 · $91K/yr market · 119K searches/yr · $6.41 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 48/100 · $91K/yr market · 119K searches/yr · $6.41 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Battery Post Shims — $91K/yr Amazon US Niche (2026) - Flapen"
---
# **battery post shims**
**Skip it**
Prices mostly outside the sweet spot ($3.54–$9.95) — this niche doesn't clear our bar today.
Market size 23Growth 18Conversion 95Competition 38Returns 46Price range 0Avg price 18Brand share 70Review moat 89Quality gap 96
**Quality gap**
**Incredible****3.9★**
avg incumbent rating — lower means beatable quality
**Conversion**
**Great****11.9%**
search→purchase rate — share of searches ending in a sale
**Review moat**
**Great****218.71**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Good****63%**
top-5 brand share — brands hold most of the demand
**Returns**
**Okay****3.3%**
return rate — above 5% kills the launch gate
**Competition**
**Okay****62%**
top-5 click share — leaders hold, buyers still browse
**Market size**
**Bad****$91K**
$91K/yr · 119K searches
**Growth**
**Bad****-14.9%**
90-day search growth — must beat 0% to launch
**Avg price**
**Bad****$6.41**
avg listing price — sweet spot $15–$100
**Price range**
**Bad****$3.54–$9.95**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%") [** Quality Gap**](https://flapen.com/research/niches?market=us&signal=quality_gap "Avg rating < 4.0")
According to Flapen's Amazon United States niche tracking, battery post shims is a $91K/yr Amazon United States market (119K searches/yr). The top 5 brands hold 63% of demand. Demand peaks in Jan–Feb. Verdict: Skip it — 48/100.
Data updated Jul 9, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **battery post shims market data**
- **Units sold / yr**
- **13K–15K**
- avg 500–750/product
- **Revenue / yr**
- **$80K–$96K**
- units × avg price
- **Conversion rate**
- **11.9%**
- **Avg BSR**
- **#384**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **48%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **35 months**
- **Avg seller age**
- **180 days**
## **Competition & brand share**
The top 5 products take 62% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**19 **—flat
**Sellers**
**25**
**Top-5 brand share**
**63%**
Top 20: 100%
**Top-5 click share**
**62%**
Top 20: 99%
**Open market**
**30%**
- BESULEN16% - eMagTech16% - smilfuy15% - QWORK10% - AQEENURA7% - Ampper7%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -14.9% search growth over the last 90 days.
3K2KSpike '24Spike '25Holiday '25 seasonSepDecMarJunAugNovMarMay
Peak months: Jan, Feb · busiest ÷ quietest = 1.6×
[**Open Trend **](https://flapen.com/research/us/automotive/battery-post-shims/trend)
## **Top battery post shims search terms**
- **battery terminal shim**39K/yr-17.5%11.2% conv. - **battery post shims**29K/yr-9.7%12.3% conv. - **battery shim**11K/yr-26.1%10.0% conv. - **battery post shim**8K/yr-21.0%10.9% conv. - **battery terminal shims**7K/yr-15.8%11.3% conv. - **car battery terminal shim**5K/yr-3.9%11.6% conv. - **car battery post shims**5K/yr-5.4%10.9% conv. - **battery shims**5K/yr-12.9%11.6% conv. - **battery terminal sleeve**4K/yr+11.9%8.3% conv. - **car battery shim**5K/yr-26.8%12.2% conv. [**All search terms **](https://flapen.com/research/us/automotive/battery-post-shims/search-terms)
## **Top battery post shims 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%4%$4K8%$7K12%$11K16%$15K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 21 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**eMagTech 4pcs Car Battery Terminals Shims Clamps Posts Spacer Shims for in-car Audio Video Connectors Silver**eMagTech**$9.03**4.5★57 rev](https://www.amazon.com/dp/B0F8HRG8KF) [2**BESULEN 10PCS Car Battery Post Terminal Shims Auto Lead Terminal Shim Caps with 12 Piece Washers for Top Post Battery Post Ends Repair Universal for Vehicles SUV Truck RV Boat**BESULEN**$7.94**4.4★305 rev](https://www.amazon.com/dp/B0CKYG11WQ) [3**smilfuy 1 Pair Battery Post Shims Pure Lead Anode Cathode Sleeves**smilfuy**$4.83**3.6★324 rev](https://www.amazon.com/dp/B0D7VQPRJM) [4**QWORK Battery Post Shims Cap 4 Pack Terminal Cable End for Positive or Negative Post**QWORK**$7.29**4.1★188 rev](https://www.amazon.com/dp/B09P51G47F) [5**Universal 10PCS Car Battery Post Terminal Shims Kit with Washers - Silver Color Terminal End Repair Accessories**AQEENURA**$7.69**4.0★60 rev](https://www.amazon.com/dp/B0DZ6JSHZH)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**4PCS Car Battery Terminal Shim Kit with 4PCS Washers Positive & Negative Car Battery Post Shims for Worn Batteries Post Repair Lead Cars Batteries Shim for Cars SUVs**EWOJUYE**$5.36**11 rev5mo ago](https://www.amazon.com/dp/B0GLQ9D816) [**TNAIYH Car Battery Post Terminal Shims with Washers 4PCS Positive & Negative Auto Lead Terminal Converter Shim Caps Vehicle Pure Anode Cathode Sleeves Universal for SUV RV Truck**TNAIYH**$5.85**12 rev8mo ago](https://www.amazon.com/dp/B0FX9WLKGN) [**2 Sets Battery Post Shim Set With 14 Washers - Lead Terminal Shim Caps for Car Battery Repair - Fits Top Post Battery Ends**Quadafy**$6.08**36 rev8mo ago](https://www.amazon.com/dp/B0FX52JFPL) [**2 Pcs Battery Post Shims Car Battery Terminal Shims Extender Adapter Sleeve Automotive Pure Lead Anode Cathode Cap Spacer for Positive Negative Connection**SISABAMA**$4.15**30 rev9mo ago](https://www.amazon.com/dp/B0FR47T2G2) [**GAOLAOSY 1 Pair Car Battery Post Shims Pure Lead Auto Positive & Negative Post Converter Shim Caps Anode Cathode Adaptor Sleeve Universal Car Battery Terminal Connection Part Accessories (2PCS)**GAOLAOSY**$3.94**16 rev1y ago](https://www.amazon.com/dp/B0FFYNPKDL)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**4PCS Car Battery Terminal Shim Kit with 4PCS Washers Positive & Negative Car Battery Post Shims for Worn Batteries Post Repair Lead Cars Batteries Shim for Cars SUVs**EWOJUYE**$5.36**4.4★**▲ 255%**](https://www.amazon.com/dp/B0GLQ9D816) [**Alieemo 10PCS Car Battery Terminal Shims with 12 Washers Battery Post Repair Kit Universal Anti-Corrosion Lead Terminal Shim Caps for Loose Ends on Auto Truck SUV RV Boat (Red & Green/Shims)**Alieemo**$5.31**4.8★**▲ 116%**](https://www.amazon.com/dp/B0FW4MXWQH) [**BESULEN 10PCS Car Battery Post Terminal Shims Auto Lead Terminal Shim Caps with 12 Piece Washers for Top Post Battery Post Ends Repair Universal for Vehicles SUV Truck RV Boat**BESULEN**$8.16**4.4★**▲ 102%**](https://www.amazon.com/dp/B0DYNZSRC6) [**TNAIYH Car Battery Post Terminal Shims with Washers 4PCS Positive & Negative Auto Lead Terminal Converter Shim Caps Vehicle Pure Anode Cathode Sleeves Universal for SUV RV Truck**TNAIYH**$5.85**3.3★**▲ 101%**](https://www.amazon.com/dp/B0FX9WLKGN) [**eMagTech 4pcs Car Battery Terminals Shims Clamps Posts Spacer Shims for in-car Audio Video Connectors Silver**eMagTech**$9.03**4.5★**▲ 94%**](https://www.amazon.com/dp/B0F8HRG8KF)
**~~View all trending →~~**
## **What buyers say about battery post shims**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**15%
*“The quality of the soft lead construction is excellent”*
**Value For Money**10%
*“Good price”*
**Battery Life**9%
*“I can give your battery extra life”*
**Size-Overall**9%
*“Fit ok”*
**Advertised Vs Actual Product**8%
*“As advertised”*
**Efficiency**7%
*“it works great”*
**Ease Of Use**6%
*“Fairly easy”*
**Assembly/Installation**3%
*“Easy install”*
**Connectivity-Overall**3%
*“maximum-contact connection”*
**Rusts/Corrodes**3%
*“It's always good to have this since it prevents corrosion”*
### **What buyers complain about **
**Size-Overall**36%
*“Does not fit”*
**Thickness**23%
*“Would have been better if it were thinner”*
**Connectivity-Overall**3%
*“You cannot connect once the covers are on the post”*
**Durability**3%
*“would break if I tried too”*
**Functionality-Overall**3%
*“Didn't work for me”*
**Quality-Overall**3%
*“Cheap”*
**Ease Of Use**2%
*“Could not use at all”*
**Natural Resource Wastage**2%
*“WASTE OF TIME AND MONEY”*
**Grip**1%
*“Needs better grip surface”*
**Value For Money**1%
*“Waste of money”*
### **Top return reasons **
**Size-Overall**65%
**Advertised Vs Actual Product**8%
**Thickness**4%
**Compatibility-Overall**4%
**Functionality-Overall**4%
**Defective Material/Parts**4%
**Quality-Overall**2%
**Value For Money**2%
**Material Quality**1%
**Assembly/Installation**1%
## **Common questions**
- **Is battery post shims profitable to sell on Amazon United States?**
- The niche generates $91K/yr across 21 tracked products. 0 of 4 products launched in the last 360 days are still selling. 90-day search growth is -14.9%. Flapen's verdict: Skip it (48/100).
- **How competitive is the battery post shims niche?**
- 19 brands and 25 sellers compete. The top 5 products take 62% of clicks and top 5 brands hold 63% of demand.
- **What do buyers complain about in battery post shims?**
- Top complaints mined from reviews: Size-Overall, Thickness, Connectivity-Overall. The return rate is 3.3%.
- **When does demand for battery post shims peak?**
- Demand peaks in Jan–Feb; the busiest month runs 1.6× the quietest.
- **What does it cost to enter the battery post shims niche?**
- Listings span $3.54–$9.95; the average listing price is $6.41 (sweet spot $15–$100). The average incumbent carries 219 reviews — the moat a new listing must climb.
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