Strongway Smart Battery Charger 12 Volt, 2/10/25 Amp 12 Volt charging rate 7-stage operation to match your battery's needs Interactive LCD display shows charging rate selected, battery type selected, percent of battery charge, reconditioning process, engine start process, and error messages in an easy-to-read format Short circuit, reverse polarity, overcharge and overheat protection prevent damage to the battery and the charger Unit can begin a charge, even if the battery is drained as low as 1.5V