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Most of the tenders I see look at the battery voltage and completely stop charging the battery so that there is not even a trickle charge. When the tender sees the voltage drop it trickle charges and keeps it topped off with out any harm to the battery.
Most of the batteries are sealed and I think you'd have to pump some current through them to get them dried out...
I think he's having a problem with the engine starting with no complaint about the battery or cranking..
+1 on the above.
The tender will stop charging once it meets a certain voltage or time out... Unless you have an older unit that DOES NOT MAINTAIN (voltage drops once the batties fully charged), leaving the tender on will be fine...