Battery electrical problems

hi all, bought a Range Rover vogue 2005 3 Lt diesel. Intending to restore to former glory. What I need help with is: the battery goes completely dead after a few days. Had the AA out to get me started and he said the battery was charging fine! The chap who I bought it off said he replaced a pc box, which is under the passenger seat, because he couldn’t get the boot to unlock, don’t know if this is anything to do with the problem? Anyway if you help with advice or pointers I would appreciate it.
Thanks in advance
Hayden

Have a search in the Range Rover section. ISTR someone did a checklist of which fuses did what and their working and stood amperage use, or battery drain!

Thanks will check it out