On a 2005 Niagara if I plug into shore power overnight once a month will that be sufficient to keep the battery charged enough? Or should I get a battery tender ? Or a battery charger (engine starter capable) that can be used as a battery tender. I've read that after use the battery should be brought back up to full charge. Will a battery tender such as the Battery Tender Jr. or Battery Tender Plus bring the battery up to it's peak charge or would I need the stronger charger to bring it back up to peak charge? Do any of these come with a voltmeter? I've read that on newer model pop ups plugging into shore power is the way to go that the converter will "juice up" the batttery - I've also read that it's not recommeded as some feel that would be overuse of the converter. - IDK if mine is new enough to just plug into shore power to "juice up" - recharge the battery. I don't want to bring the battery into the house for the winter so looking for the best way to keep the battery charged enough over the winter.