Great question... Friends bring me batteries with everything from hay string to hoof nippers for battery handling devices
I have a few different types just because you find as many kinds of attachment systems as there are makers out there.
And of course, some of them with no way to attach at a strap all.
The black plastic strap with the hooks on the end are my favorite.
The red strap works on post type batteries and I couldn't find my least favorite back torture device... the adjustable brick style battery carry device.