Disconnecting battery for storage

[KitsonRis]

So my Clio, E34 and Z3 are not being used for the winter I need to do something to the batteries to disconnect it to stop them going flat.

I used to be able to trickle charge the E34 with a battery conditioner thing and that was ideal. Don’t have the option to do it in my new house.

The question is if I disconnect the battery and leave them out the car for a few months will that damage the battery, like what can happen when you let them go flat. As I think the Z3 battery has had it I don’t want to buy a new one now and it go bad before I get to use it in the spring and end up needing a second.

 

[Bluebeard]

I just disconnect the negative lead and leave the car as is.
Then a few days before you want to fire it up again, stick a charger on it to make sure it’s topped up.
A good battery shouldn’t go flat flat if it’s not connected to anything.

 

[kurai]

I just disconnect the negative lead and leave the car as is.
Then a few days before you want to fire it up again, stick a charger on it to make sure it’s topped up.
A good battery shouldn’t go flat flat if it’s not connected to anything.

Exactly this.
If there is nothing draining in the car the battery will stay at high charge levels without problems if its chemically ok.
I usually do the same with my bikes to keep batteries alive during Winter.

Except when I forget and on spring I have a nice surprise 🤣