I have bought this brand for YEARS and been totally happy with every purchase. What they don't tell you about this little charger is that if it isn't plugged in to an AC outlet it actually DRAWS power from your battery. The eyelet connections implies you can hook it up and plug it in when you need to and leave it connected to the battery. This is not the case. Had this on my generator battery and it charged perfectly. I unplugged the ac cord and left the charger connection attached to the battery. Came back 3 days later and the battery was completely dead. Used another charger to charge it again and noticed that the red light on the original charger illuminate (it was not connected to ac at this point). When I pulled the other charger off the battery the light stayed on and began to discharge my battery again. If by "fully automatic" they mean it will automatically fully discharge your battery, then they are accurate. Very disappointed.