Disconnect battery while off the road

[jt racing]

Hi.
Unfortunately I'm having to park up my a8 for a few months while I work away and it'll be parked up at the in laws.
Am I better to disconnect the battery to save it being drained off and dying? Can't really plug in a trickle charger and I know they won't remember to start it up regularly.
It'll be parked for about 5 months.
Thanks for the advice!