Preventing battery drain while in storage for months or not being used for weeks Saw a discussion on this on another forum, with suggestions to resolve this all over the place. Pedro--what's the current best info on reducing parasitic drain on Porsche cars? Has it changed over the years (9896/987/981)? Currently, I lock mine and have a tender on the battery, but some people suggest unlocking the boot to ensure access to the battery. Thanks for any help in advancehttps://pedrosboard.com/read.php?7,56331,56331#msg-56331Tue, 19 May 2026 20:37:37 -0400 Phorum 5.2.23 https://pedrosboard.com/read.php?7,56331,56342#msg-56342 Re: I use a Battery Tender & I have kept the tender plugged in . . .https://pedrosboard.com/read.php?7,56331,56342#msg-56342 John Brown of SE SoDak Main ForumMon, 06 Mar 2023 17:45:58 -0500 https://pedrosboard.com/read.php?7,56331,56341#msg-56341 Re: Preventing battery drain while in storage for months or not being used for weekshttps://pedrosboard.com/read.php?7,56331,56341#msg-56341The $8 switch is easy to use but it actually limits the current flow from the battery vs connected directly.
When doing this, I would also open the frunk and close the latch with a screw driver (trunk light goes off) the just lower the hood.
It will not latch because the latch is closed so there's no danger in getting shut out of the trunk.
Happy Boxstering,
Pedro]]> Pedro (Odessa, FL) Main ForumSun, 05 Mar 2023 09:29:12 -0500 https://pedrosboard.com/read.php?7,56331,56338#msg-56338 Re: The ECU is reset.... Thanks very much! JB *NM*https://pedrosboard.com/read.php?7,56331,56338#msg-56338 John Brown of SE SoDak Main ForumFri, 03 Mar 2023 18:48:58 -0500 https://pedrosboard.com/read.php?7,56331,56337#msg-56337 The ECU is reset....https://pedrosboard.com/read.php?7,56331,56337#msg-56337I have looked at the parameters due to requiring an emissions test. My car reset fully after 20 minutes of driving, YMMV.

You will note that the car starts roughly the first time out, but is fine after that. I suspect the bigger issue leaving the car would be deteriorating gasoline. There are additives or you can run it dry before storage.]]> JM-Stamford,CT Main ForumFri, 03 Mar 2023 15:34:26 -0500 https://pedrosboard.com/read.php?7,56331,56336#msg-56336 Re: Back in the day when this topic was discussed, it was claimed disconnecting the battery . . .https://pedrosboard.com/read.php?7,56331,56336#msg-56336 John Brown of SE SoDak Main ForumThu, 02 Mar 2023 15:05:07 -0500 https://pedrosboard.com/read.php?7,56331,56334#msg-56334 Re: Preventing battery drain while in storage for months or not being used for weekshttps://pedrosboard.com/read.php?7,56331,56334#msg-56334
Quote
Sayle
I just disconnect the negative terminal and the car starts right up when I remove it from storage.

which is exactly what this $8 switch does in approximately 3 seconds without a wrench.]]> frogster Main ForumWed, 01 Mar 2023 19:56:29 -0500 https://pedrosboard.com/read.php?7,56331,56333#msg-56333 Re: Preventing battery drain while in storage for months or not being used for weekshttps://pedrosboard.com/read.php?7,56331,56333#msg-56333 Sayle Main ForumWed, 01 Mar 2023 17:58:13 -0500 https://pedrosboard.com/read.php?7,56331,56332#msg-56332 Re: Preventing battery drain while in storage for months or not being used for weekshttps://pedrosboard.com/read.php?7,56331,56332#msg-56332seriously though, the boxster would not be touched for a good five months and i never had a problem starting it up. i did not have a battery tender because there was no electricity in my garage.
hope that helps.

battery disconnect]]> frogster Main ForumWed, 01 Mar 2023 12:15:46 -0500 https://pedrosboard.com/read.php?7,56331,56331#msg-56331 Preventing battery drain while in storage for months or not being used for weekshttps://pedrosboard.com/read.php?7,56331,56331#msg-56331
Pedro--what's the current best info on reducing parasitic drain on Porsche cars? Has it changed over the years (9896/987/981)?
Currently, I lock mine and have a tender on the battery, but some people suggest unlocking the boot to ensure access to the battery.
Thanks for any help in advance]]> MikenOH Main ForumWed, 01 Mar 2023 10:02:53 -0500