How do these connect to the wire?

They plug in. They are made to connect two wires that have connections already.

How is this sae polarity connect adapter working? Does it compatible with battery tender cable?

Yes, it woks well with battery tender extension cable.

can these be used to connect harbor frieght 25w solar panels in series?

These reverse the output polarity of the panel, so to connect to identical panels, would require two connectors in series to maintain the correct polarity. For different manufacturers panel, the polarity may be different, so connecting different panels would require just one connector .

Do you sell just the regular sae? i am looking to connect battery wires and can't find them anywhere.

Yes, please check the following link:https: https://www.amazon.com/dp/B06X6LJTD6?ref=myi_title_dp&th=1 https://www.amazon.com/dp/B073158Q24?ref=myi_title_dp&th=1

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Sunway Solar SAE Polarity Reverse Adapter Connectors for Quick Disconnect Extension Cable, Solar Panel Battery Power Charger and Maintainer-3Pack

Product ID: 718358937

Details

Brand
Sunway Solar
Item Weight
1 Ounces
Wattage
6 Watts

R$367

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
Sunway Solar
Item Weight
1 Ounces
Wattage
6 Watts

Description

Sunway Solar SAE Polarity Reverse Adapter Connectors for Quick Disconnect Extension Cable, Solar Panel Battery Power Charger and Maintainer-3Pack : desertcart.in: Garden & Outdoors

Specifications

ASIN	B07GPGPTFV
Brand	Sunway Solar
Brand Name	Sunway Solar
Item Weight	1 Ounces
Model Number	SAE Polarity Reverse Connectors
Number Of Pins	2
Number of Pins	2
Part Number	SAE-05A
UPC	739750152676
Wattage	6 Watts

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