Battery Issue??

Positive is ok it’s the negative on the left with the cover on which shouldn’t be used. My battery to battery charger was connected to both terminals causing Vehicle battery charging issues, the negative has to be moved to a body earth point.
Mine is only on positive, just checked.
 
Have a read of this post - it’s very informative
I'm now curious to know what this "device" or "Shunt" ,as people are refering to it as, actually is? I have heard the term used before but I don't know what it is or actually does? Sorry for being a bit nosey....
 
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