Disconnect battery when parked?

RustyRatRod said
The ammeter is always hot

But just like in your house (all the wires in your house are hot all the time)

Unless current is flowing (ie a load is applied and a complete circuit is made) it poses little to no hazard

If the wiring is in decent shape there is little to no hazard.

For me... I leave the battery attached 24 /7