Not sure that I understand. All "trickle" charges are not the same. Battery Tender contains a chip to carefully monitor when to charge and for how long.Furstratingly, I have this same issue. I have a 2012 Evora S that sits in th a garage on a trickle charger most of the time. I have had to replace the battery twice in the last three years. The trickle charger works for a few months, then I return to find a flashing red light and a completely dead battery. Have no idea what is causing this, but it's driving me crazy. Hope someone has some ideas on the forum.
The trickle charger on my generator always was on and killed the battery in 4 years.
So, what kind of charger have you? Smart or dumb?