PHML

Hey gang...Im going on a biz trip for over a week. Should I disconnect the battery? I don't want to come home to find a dead battery. Any harm to the ECU or resetting issue is I do disconnect the battery?

jvc300

I leave every week and sometimes two weeks at a time with no issues.

BenzV12

If your battery is new there should be no problem .
For extended periods , some guys recommend battery conditioners

dsayed

For a week no. For 6 months: maybe.

BM2BZ

how about three weeks ? i'm planning to go on a trip this summer for three weeks. i have never done it for all my cars before and didn't have any problem but wanted to know if disconnect is the way to go .

K-A

Anything less than a couple of months at minimum and you shouldn't do anything but lock the doors and preferably leave a clean car (for piece of mind than nothing else).

dsayed

All modern cars discharge due to the various systems that are sitting there listening for things (e.g. remote sensors for the doors, alarm, etc.) Normally this rate of discharge shouldn't be enough to be a worry because once you drive the alternator will recharge the battery. However, if the car isn't being used for several months, the battery could be drained to such a level that it will not start the engine. This is why you often see trickle or solar charged used at dealers.
The amount of time for a battery to discharge will depend on many variables including the health of the battery.

RNBRAD

One thing to not is our cars do noit use a small battery. These things are beasts and really should be good for months without a problem. I know my W211 has sit for over a month and never an issue.

Arrie

One week is nothing. I leave my car for a week at least twice a month. Never start issues. Has left for two weeks, no problems. Left my E350 for three weeks twice and no problems to start it.

I would absolutely not disconnect the battery. That could result in problems.