What battery tender is everyone using or recommending

I use this one. I have AMG and non AMG batteries and this does anything. I go weeks rotating between my Jeep and AT4X and the other is on this maintainer. I did quick connects run from the battery on each rig out to the front bumper or grill so I don’t have to pop the hoods, just plug the quick connect on the maintainer to the rig then select the battery type. I feel it works really well, I am on year 7 with the yellow top Optima in my Jeep, the 4X is only 2 years old so too early to tell.
 

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