I am thinking this one:
http://www.lowes.com/lowes/lkn?action=productDetail&productId=284083-46965-VEC1087CBD&lpage=none

But this one looks better:
http://www.griotsgarage.com/product/car+maintenance/battery+care/battery+manager+iv.do

__________________
2018 Subaru Crosstrek (Mine)
2019 Subaru Outback (Wife's)
1979 300CD (sold)