Battery Tender Waterproof 800 12V 800mAh - Deltran Battery Charger DBT02200150DLWH - Batteries Plus
link as asked for^^
i work for batteries plus and have been for about a year and 3 months. and yes, you can hook these up and leave them, they are equipped with a auto float mode that allows them to shut themselves on and off when charge either drops or hits capacity.