Help with battery advice
 

Hello guys! I own a 2016 camry le, I taking a trip for 20 days so my car will be stored for that period of time, my questions are
Do I have to disconnect the battery negative cable? I do not wanna lose my presets, or the battery will hold the charge if I leave it connected for that long?
Any advice will be appreciated
Thanks

A disconnected battery loses about 3% of its charge per month.

A connected battery will lose more as there is parasitic drain. But not enough to prevent starting after 20 days.

Make sure the battery is fully charged prior to parking the car. Drive car to parking area and turn off. Don't restart and shut off once at the parking spot.

Dome/reading light off, doors closed.

If the car has an alarm, triggering it will drain more power from the battery. This will only be a problem if constant triggering.