Our advanced 30A Automatic Portable Battery Charger harnesses high frequency technology and automatically delivers three-stage charging for your Gel, AGM or flooded start or deep-cycle battery. An easy to read digital LCD screen displays charging and battery status with intuitive icons, and features a patented Alternator Check to indicate if the alternator is maintaining battery level. The Engine Start Timer gets you back on the water (or the road) quickly with a 40amp boost. It’s simple to use and easy to store with cable wrap and clamp storage built in.