I too am a fan of the Battery Tenders. I've left some of them plugged in for months without issue. They stop charging at 12.3 volts so that there is no danger of overcharging.
I use BMW Battery Tenders. There are the simple black ones, I have 5 of them & the fancy Gold Tenders, I have 3 for newer cars. So far no issues I have a Noco jump pack just in case.
I have a variety of different BatteryMinders. They are similar to Battery Tenders - but a different brand.
I have them scattered between my boat, cars, power equipment... all sorts of things.
I think I have 11 or 12 of them now.
This is their current 'regular' model
I use a red top optima battery; just replaced one that was 12 years old. My issue is that when I connect my deltan unit to the optima it never shows fully charged state; the green light just keeps blinking…….. is the deltran actually charging the battery or do I need a different approach to maintaining the optima. I am connecting directly to battery posts.
I have a red top optima and my charger (Noco or Battery Tender) reaches solid green. Perhaps your unit isn’t working - another car battery you can test it on?
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