Battery recently let me down so went out and bought a new one.

Happened few weeks later so thought okay not battery. Dodgy connections as they did look a bit fucked.
New terminal connectors and new earth strap. Everything cleaned and firmly attached.

Week goes by then happens again. Alternator tested and putting out a strong 14 volts.

So I assume something is draining it when car is off. Leave car standing for 10 hours and check battery before and after and it does show a drop in the battery.

Any ideas where to start looking ?? I thought ignition off cuts everything from draining battery but guess I am wrong.
I suppose its possible they sold me a duff battery but it charges up fine ?!?!?!?

One of those cars where it has too much electronics so not sure where to start.

Thanks for any advice guys.