I don't have the original, just the allcharge. I have my onboard charger hooked up to my cranking battery so I can still plug it in to top everything off. My charger shows green lights when my cranking battery is charged. My question is, can I leave it plugged in overnight? my "smart" charger says my battery (cranking) is charged but the allcharge cycles throught constantly. Don't want to "overcharge" my batteries. Also, is a voltmeter the only way to know if the trolling batteries are fully charged?