how to prevent battery drainage during long details?...

You could try taping the switches to kill the lights. If it pushes too hard put a penny or something behind the tape.
 
If you can put it in a garage. Wind chills will affect it a little bit ”.The best thing is once you start the car up, make sure it warms up and gives a chance for the battery to recharge. All these can prevent battery drainage. For more details visit www.batterywale.com
 
I'll chime in as someone who fixes cars as a living. I would definitely look into a good automatic charger if you're spending a lot of time in the car. With newer cars, sometimes even touching the door handle will cause the car to "wake up" and try to be primed and ready for the driver - fuel pump primes, bluetooth module wakes up and attempts to connect to the phone, and various systems go live. Most will "fall back asleep" within about 20 minutes, but an hour is not uncommon for some cars. If you didn't want to put a charger on it, I would suggest opening all the doors and leaving them open to help cut down on wake ups. Unfortunately a lot of times moving the seat or bumping a button inside can wake it up again.

I would also shy away from disconnecting batteries - as others have mentioned, it can sometimes be a headache reinitializing everything (from windows, clock, and radio to panoramic sunroofs and stability control systems).
 
Most probably it is not the dome lights remaining on for long periods of time that is the problem but moving power seats back and forth, up and down while cleaning carpets/mats that real culprit. If dome lights prove to be the real issue, on most cars they are easy to turn off via overhead switches.
Yes and no, I totally agree that power seats are more of a problem but maybe its me on some cars I cannot figure out how to turn these dome lights off.

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