Battery Tender 4 Amp, 6V or 12V Selectable Battery Charger, New

I have owned a few Battery Tenders over 10 years. Only one, old-style metal one, failed after being left out in the elements and harsh desert sunshine for a few years. I had forgotten it. The new ones seemed sealed real well. I have a few vehicles that can sit unused for months and in one case 2 years. A dead battery from neglect is expensive and frustrating. After replacing 2 expensive batteries I decided to find a solution. With these Battery Tenders, I keep the pig-tail dual-wire plugs always attached to the main clamps on the installed car battery for a solid connection. It makes it easy to swap cars and battery connections from car to car. 3 of my cars have the pig-tails permanently on. The two-wire pig-tail plugs into the cable attached to the wall powered Battery Tender. A yellow LED comes on if the battery is charging. It turns green once it's charged. That's all there is to it. The Battery Tender electrically exercises the internal battery plates in the battery acid over time. I don't understand the science much. But it works well for me. I had my Chevrolet Tahoe plugged into one for 2 years while it went under a slow renovation. I was able to start the car easily every month or so. After 2 years there was some white corrosion showing around the battery posts. But it started every time, and now that I drive the truck daily, the battery continues starting easily and quickly. That same Battery Tender is now on another car while I work on it. I swear by these things.

Bought this to maintain my personal truck battery because I only drive it on the weekend and I was having a problem with a parasitic draw. I have since fixed that but still use it because why not? I bought a pig tail from Amazon to hardwire this up to my battery from the bumper. So I took the alligator clips off and the cable plugs right into the cable I wired straight to the battery terminals. I have a video but this app only allows