mercedes auxiliary battery
Skip itA small market ($66K/yr) — this niche doesn't clear our bar today.
Avg price
Great$47.96avg listing price — sweet spot $15–$100
Price range
Great$15.35–$104.64cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Good4.3★avg incumbent rating — lower means beatable quality
Review moat
Good793avg incumbent reviews — the moat a new listing must climb
Brand share
Okay76%top-5 brand share — brands hold most of the demand
Returns
Okay4.0%return rate — above 5% kills the launch gate
Conversion
Okay2.8%search→purchase rate — share of searches ending in a sale
Competition
Okay68%top-5 click share — leaders hold, buyers still browse
Market size
Bad$66K$66K/yr · 49K searches
Growth
Bad-15.9%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, mercedes auxiliary battery is a $66K/yr Amazon United States market (49K searches/yr). The top 5 brands hold 76% of demand. Verdict: Skip it — 41/100.
Data updated Jul 9, 2026 · scored weekly · How we score niches
mercedes auxiliary battery market data
- Units sold / yr
- 1K–2K
- avg 0–100/product
- Revenue / yr
- $60K–$72K
- units × avg price
- Conversion rate
- 2.8%
- Avg BSR
- #209
- Page quality
- 0%
- Prime
- 69%
- Sponsored
- 85%
- Out of stock
- 8.6%
- Avg brand age
- 74 months
- Avg seller age
- 173 days
Competition & brand share
The top 5 products take 68% of clicks — established leaders, but buyers still shop beyond them.Brands
10 falling
Sellers
27
Top-5 brand share
76%
Top 20: 100%
Top-5 click share
68%
Top 20: 100%
Open market
17%
- Genuine33%
- Casil16%
- Upstart Battery14%
- letoom7%
- winbasic7%
- Mercedes Benz6%
- Open — no brand owns it (4 brands, 17%)
Demand
Weekly Amazon search volume, last 27 weeks — -15.9% search growth over the last 90 days.Top mercedes auxiliary battery search terms
- auxiliary battery mercedes benz13K/yr
- mercedes auxiliary battery17K/yr
- mercedes auxiliary battery e3506K/yr
- mercedes benz auxiliary battery6K/yr
- ml350 auxiliary battery3K/yr
- mercedes-benz auxiliary battery4K/yr
Top mercedes auxiliary battery 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.
All 13 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
2007-2023 Mercedes-Benz (000000-004039) Sealed Lead-Acid Auxiliary Battery/Not a Starter Battery
Genuine$47.424.4★1,505 rev
YTX14-BS 2115410001 Replacement for Mercedes Benz Auxiliary Battery - 12V 12AH Secondary Backup Aux Battery for E350 CLA 250 GLK 350 E320 ML350 E500 CLS 400 GLA 250
Upstart Battery$36.623.8★72 rev
Casil 12V 1.2Ah SLA AGM Battery Rechargeable Auxiliary Power Compatible with Mercedes-Benz N000000004039
Casil$15.354.4★224 rev
letoom 12v 1.2ah Batteries Compatible with Mercedes-Benz Auxiliary Battery 2007-2023 oe n0000004039
letoom$38.184.4★22 rev
12v 1.2ah Battery Compatible with Mercedes-Benz AuxiliaryBattery(2007-2023) OE N000000004039
winbasic$38.494.1★41 rev
Newest
by launch date
UPLUS AUX4039 Auxiliary Battery For Mercedes-Benz 2007-2023 000000-004039
UPLUS NEW TECHNOLOGY BATTERY$22.801,090 rev
UPLUS Auxiliary Battery AUX14-UP 12V 14Ah 200 CCA AGM Maintenance Free Rechargeable SLA Backup Batteries replace for AUX14 AUX12 BCI Group 400
UPLUS NEW TECHNOLOGY BATTERY$78.981,090 rev
12v 1.2ah Battery Compatible with Mercedes-Benz AuxiliaryBattery(2007-2023) OE N000000004039
winbasic$38.4941 rev
letoom 12v 1.2ah Batteries Compatible with Mercedes-Benz Auxiliary Battery 2007-2023 oe n0000004039
letoom$38.1822 rev
YTX14-BS 2115410001 Replacement for Mercedes Benz Auxiliary Battery - 12V 12AH Secondary Backup Aux Battery for E350 CLA 250 GLK 350 E320 ML350 E500 CLS 400 GLA 250
Upstart Battery$36.6272 rev
Trending
90-day click momentumUPLUS AUX4039 Auxiliary Battery For Mercedes-Benz 2007-2023 000000-004039
UPLUS NEW TECHNOLOGY BATTERY$22.804.5★
UPLUS Auxiliary Battery AUX14-UP 12V 14Ah 200 CCA AGM Maintenance Free Rechargeable SLA Backup Batteries replace for AUX14 AUX12 BCI Group 400
UPLUS NEW TECHNOLOGY BATTERY$78.984.5★
YTX14-BS AGM Battery Replacement for Mercedes Auxiliary Backup Battery 2115410001 12V Maintenance-Free Sealed Powersports Motorcycle ATV Generator Battery ETX14 TX14 Compatible
Casil$43.083.7★
Casil 12V 1.2Ah SLA AGM Battery Rechargeable Auxiliary Power Compatible with Mercedes-Benz N000000004039
Casil$15.354.4★
YTX14-BS 2115410001 Replacement for Mercedes Benz Auxiliary Battery - 12V 12AH Secondary Backup Aux Battery for E350 CLA 250 GLK 350 E320 ML350 E500 CLS 400 GLA 250
Upstart Battery$36.623.8★
What buyers say about mercedes auxiliary battery
What buyers praise and complain about, mined from review topics.What buyers love
“Fit just like came from dealership”
“This battery is an incredible savings over dealer installed batteries”
“Great product and value for the money”
“Good Quality”
“better then I was expecting”
“Price and easy to assemble”
“Working very well”
“Hopefully its lasts for 3 years”
“Works like it should at a fraction of price 2010 e500 mercedes”
“Came properly charged”
What buyers complain about
“the battery died”
“to small”
“Then dead”
“Incompatible with 2014 SL550 even though it is the same group number”
“did not work”
“Absolutely deceptive”
“Won't hold a charge”
“Not good quality product”
“cheap price,”
“After the installation the error message went away”
Top return reasons
Common questions
- Is mercedes auxiliary battery profitable to sell on Amazon United States?
- The niche generates $66K/yr across 13 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is -15.9%. Flapen's verdict: Skip it (41/100).
- How competitive is the mercedes auxiliary battery niche?
- 10 brands and 27 sellers compete. The top 5 products take 68% of clicks and top 5 brands hold 76% of demand.
- What do buyers complain about in mercedes auxiliary battery?
- Top complaints mined from reviews: Battery Life, Size-Overall, Durability. The return rate is 4.0%.
- What does it cost to enter the mercedes auxiliary battery niche?
- Listings span $15.35–$104.64; the average listing price is $47.96 (sweet spot $15–$100). The average incumbent carries 793 reviews — the moat a new listing must climb.