Spen

I bought a case for my Tab S7 and it has a place to hold the pen but overnight with a pen sitting in its holder not were it charges, it loses all of its battery overnight anybody have any ideas?

That's normal. The S7 has a capacitor in the Spen that charges when it's in contact with the spot on the back. Charge lasts about 30 hours or so (with no use).

I just take my Spen out if the case holder and charge it for 5 minutes or so each morning.

Note that the Spen works for most purposes with no charge.

I use my tablet and S pen every day for work, entertainment, shopping, browsing, etc and have never yet used the S pen for anything that requires it to be charged.