I have used the Battery Minder 1510 and 12177 for several batteries in stored vehicles, tractors, etc. My dad is an Electrical Engineer and brought this minder to my attention when I was going to purchase a battery tender. The battery minder has an algorithm which desulfates the battery as it keeps it charged and I have had a mopar reproduction battery in my Road Runner for 7 years and it is still strong. Would use nothing else. You can hook up to 4 batteries to one unit with a SAE splitter and this works well too. Also works with AGM and has kept my Harley battery alive for 4 years so far.