That is a great float charger, but a Battery Tender (TM) or Battery Mi9nder (TM) is a 2-stage charger.. Yours is the last stage.
Add the "Plus" and it adds a 3hird stage (Feature) and that one can really mess up up a radio.(If the product description is to be believed) "High speed pulse desulfacation mode") High frequency pulse means harmonics from fundemental to dang near LIGHT. Check that, there is a blinking LED, that's light.
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