Winter Storage
Le Mans Master
Joined: Apr 2012
Posts: 7,814
Likes: 2,266
From: Brighton MI
It really doesn't matter, but it's always a bit safer to disconnect the negative...reason being messing with the positive side while the ground side is still hooked up can lead to an accidental short circuit. Big sparks = bad. 
Drifting
Joined: Jul 2017
Posts: 1,365
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From: S.E. Pennsylvania
What is the point of disconnecting the battery? I use a battery tender on mine for all of the 6 months it's stored. Battery lasts longer and stays charged. Have a battery on my '66 that's 7 years old and still going.
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I too leave the battery connected and use a Battery Tender to keep the battery charged.
Le Mans Master
Joined: Apr 2012
Posts: 7,814
Likes: 2,266
From: Brighton MI
No doubt a battery tender is the best solution, but if you don't have one then disconnecting the battery is your next best option. The battery will still discharge over time, albeit at a much slower rate because there is no parasitic draw on it. 
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Burning Brakes
Joined: Oct 2014
Posts: 874
Likes: 107
From: Detroit MI
I pull the battery and put it in the basement on a tender so it's not subjected to super cold weather. Battery is 7 years old now and still works great. Will probably replace it this spring though.
Drifting
Joined: Jul 2017
Posts: 1,365
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From: S.E. Pennsylvania
Melting Slicks
Joined: Nov 2014
Posts: 3,399
Likes: 1,339
From: Havre de Grace Maryland
No sadness here since I fun drive 12 months a year albeit not during rain, snow, ice, or when salt is on the roads in MD. My tender is the C5's alternator by driving at least once a week. Delco Battery is going on 4 years. I will replace after 4 years. I learned a long time ago not to see how long a battery will last. 
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Drifting
Joined: Sep 2017
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From: Avon Lake OH
Drifting
Joined: Jun 2013
Posts: 1,965
Likes: 343
From: Shell Point (Crawfordville) Florida
A trickle charger with the battery connected is a better idea than disconnecting it - you won't lose all your memory setting for the radio, seats, etc., and you still need a trickle charger on the battery if you store it for months unused, especially in the cold. So why bother to disconnect it, unless you are bringing it inside while you leave the car outside?
And you don't have to spend $35-50 or more for a trickle charger. I got one from Harbor Freight 4 years ago for $4.99 which is attached to a Chevy Suburban I hardly ever use and the battery is perfect. You can even use one of those 12V adapter things that you probably have lying about in the house somewhere - all you have to do is put out 1 amp or less onto the battery to maintain its' charge (to counteract the normal decay/discharge over time) and they work just fine for this task.
And you don't have to spend $35-50 or more for a trickle charger. I got one from Harbor Freight 4 years ago for $4.99 which is attached to a Chevy Suburban I hardly ever use and the battery is perfect. You can even use one of those 12V adapter things that you probably have lying about in the house somewhere - all you have to do is put out 1 amp or less onto the battery to maintain its' charge (to counteract the normal decay/discharge over time) and they work just fine for this task.
Last edited by mrlmd; Nov 2, 2017 at 08:28 PM.
Racer
Joined: May 2013
Posts: 365
Likes: 19
From: Hugo MN
Advanced
Joined: Apr 2017
Posts: 76
Likes: 15
From: Galesburg MI
It is a little sad when I put the Z away in the fall. With that said, when I take the cover off in the spring it almost feels like I am getting a new car again.
Last edited by Principal Lewis; Nov 3, 2017 at 01:47 PM.
Pro
Joined: Aug 2008
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From: Duluth MN
Burning Brakes
Joined: Aug 2013
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From: Lehigh Valley PA
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I'll get my fifth new car next spring. It's a beautiful artic white corvette w/ all black interior! PS battery tender.
Last edited by 57gman; Nov 5, 2017 at 10:34 AM.