The box with a strap is made of wood and it contains a battery. Normally the top is hinged and there is a notched out place on the side in case multiple batteries are needed to be connected together to booster amp hours or to jump the combined battery from 6v to 12v (or whatever the application).
Some have a fitting in the front that is hard wired to the terminals on the battery inside the box so you can plug in and unplug easily without having to so anything inside the box.
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