Hi Morgan
Please see picture inside pocket. The point you mark red line your last post is "battery case". Coils are under handheld.
General schematic for pocket is here
I don't use feritte , sample etc (PDK method) for detection.
I try explain more, better for members
If we have a LRL only for Gold, sometimes we can lost a gold treasure, because this treasure is inside a copper cup. Sometimes if we have a LRL only for gold we lost a perfect silver object with high price.
My sceptics and my drawing use a simple way. A treasure hunter must be find all old buried target non-ferrus,
because, gold is rare, but objects of copper or silver sometimes together with gold is easily found.
best regards
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