These chargers are often known as ''taper chargers'' because charging latest minimizes little by little, because the battery will get billed. A transportable charger is also much easier than jump-starting off because you don't really have to string cumbersome cables from 1 vehicle to another. And it's much more compact https://www.evernote.com/shard/s417/sh/d2d9d792-2551-2cdd-fb83-596dd14bb48c/BNXKkwUHQRq26o2IjgauEVJ42lbmG1XUpSkQZ3zwHOA6igqfG4PL52QgMg