Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A must have charger

This is a must-have if you don't need an automatic charger. It puts out just a little over one amp and is great for charging new 6/12 volt batteries for the first time. If using this as a regular (everyday) charger, be sure to unplug the unit manually once battery is fully charged. This charger does not shut off automatically and will over-charge if not monitored. 5-Stars on this one!