Don't care what color or kind you get but get one with lighter plug in at the boat end showing you actually have good power to charger.
i learned this the hard way at Sam Rayburn once

Hey you stole my idea about the lime green cord. LOL

Amazon 50' 12 g

I would have bought hot pink if they had it. That is what we do with lawn chairs these days. We buy the brightest and ugliest colors so we can tell which ones are ours at a get together or game....

The problem with the green one I tried is it is not hedge clipper proof....

If an extension cord can survive Monte Coon then all is well.

Charger outputting 20 amp at 12 volts equals 240 watts.

240 watts / 120 volts = 2amps.

40 amp charger = 4 amps @ 120 volts.

So for every 10 amps on your charger 1 amp on your cord.

Your average extension cord is good for 10 Amps or more.

Well. Sort of. Don�t forget to allow for significant voltage drop which increases amperage draw. And the average efficiency of a typical charger runs about 40% efficient, so multiply the new draw times 1.6.

You get the idea.

I don�t know about you, but my garage lights dim when I plug in my 4-bank.

Charger should list how many amps it needs on 120vac. Your not going to see much voltage drop on a cord 100ft or less at 4 amps unless the socket wiring isn't sufficient.

Tired Head

I use anyone I have laying around. They all work.

I almost went with purple but very happy I went with Orange.

Didn't think I'd see the day where you now need a high dollar extension cord to catch fish......

I've been using the same one from Walmart for years.....