This charger was made and tested for sports batteries only. This element should be more clearly marked in this way. I bought this after reading good reviews about it and use it on a marine and garden tractor battery. While charging a new ship's battery, beginning at 12.61 p.m., it turned green at 1.02 p.m. after about 40 minutes. I unplugged the charger to check and then plugged it back in and it started out solid green and blinked red (indicating 75% charge) which is wrong. Three hours after turning it off, the battery was at 12.67. I called support and was told that this charger was made and tested specifically for sports batteries only. Using a lawn tractor battery the light was accurate and it charged this 3 year old battery to 13.44 (surface charge not removed). I will leave the charger on the ship's battery for a few days to see if it charges fully and holds a charge. This charger needs to be labeled differently. I was told by customer service that the headlights would probably not work properly for anything other than a sports battery (motorcycle, lawn tractor, etc.).
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