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Battery tenders have a 'float' mode, where they will first charge the battery up to full and then "pulse" charge it - it lets the voltage decay for a bit, before then charging it back up. This can vary in time, from milliseconds to minutes.
As I understand it, with modern chargers/tenders it's literally as simple as hooking it up and forgetting about it. The battery will stay charged for the length of its normal life.
I've had two CTEK models, and the second one doesn't even have an 'AGM' option on the car/motorcycle select button anymore, as it auto-detects whether the battery is lead-acid, calcium, or AGM. Cannot be used on lithium tho iirc.
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