these will work with a battery tender??? I am confused by the "reverse" polarity

Yes. The positive on the connector end is protected when unplugged. Red is positive. Black negative.

Will this work with a Schumacher charger/maintainer?

It will work with any charger with a universal 2 apron plug I think they are all the same I have 5 different ones it works with all of them

can it fit Bosch C7 Battery Charger ?

I don't think so, but if you're willing to do a little cutting and splicing you could modify the output connductors of your charger with one of the charger cords and use the other for the QD on the battery you want to charge. The black and red color coding on the wires will be goofed up at the connectors but as long as you make your permanent attachments on the battery correctly there is only one way to mate the connectors.

will they plug into each other ?

They could plug into each other, but I DON'T recommend it. It will reverse the colors and polarity to what you want to power. If you're looking to make it longer, splice the needed length in our of red/black zip code. Simple and no confusion on polarity.

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[2 PACK] SPARKING 2FT Motorcycle Battery Charger Cord, Sae to O Ring Terminal Quick Disconnect Assembly Extension Cable, Sae 2Pin Wire Harness Reverse Polarity Adapter Port Accessory, 10A Fuse

Product ID: 90111039

⚡Supports 12-24V DC wide voltage range

💧Weatherproof cover for dust & water resistance

🔋10A fuse for safe charging

€ 24.68

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Description

⚡ Stay charged, stay ahead — never miss a ride!

DUAL PACK VALUE - Two 2ft extension cables to keep multiple rides always ready
DURABLE WEATHERPROOF DESIGN - Keep your charging port safe from dust and moisture
QUICK DISCONNECT CONVENIENCE - Effortless plug-and-play connection for hassle-free charging
RELIABLE 10 A FUSE PROTECTION - Safeguard your battery with built-in overcurrent defense
UNIVERSAL 12 24 V COMPATIBILITY - Seamlessly powers most motorcycles and vehicles

The SPARKING 2FT Motorcycle Battery Charger Cord (2-pack) features SAE to ring terminal quick disconnects with a 10A fuse, supporting a wide 12-24V DC range. Its weatherproof cover ensures durability against dust and water, making it ideal for maintaining your motorcycle or vehicle battery’s charge safely and conveniently.

Specifications

ASIN	B07KS2GCXJ
Best Sellers Rank	#12,453 in Automotive ( See Top 100 in Automotive ) #6 in Powersports Battery Chargers
Brand	SPARKING
Customer Reviews	4.7 4.7 out of 5 stars (1,648)
Date First Available	November 22, 2018
Item Weight	4.2 ounces
Item model number	8542072896
Manufacturer	SPARKING
Manufacturer Part Number	YU-DBPW-9RJG-2
Package Dimensions	9.57 x 4.76 x 0.67 inches
Voltage	12 volts

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€ 24.68

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Greece.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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