todd369

Hi all -

I’ve got to store my 991.2 C4S for a few months while I’m out of the country, and the house is getting some major work done. I don’t want to keep it in the garage while construction goes on, so I rented a secure, climate controlled storage locker for it, however it doesn’t have access to power for a battery tender.

I was thinking about leaving the frunk open slightly Incase the battery goes flat so I can hook up a jump box, but not sure if that will cause further issues due to the frunk light / security etc. I know the procedure for opening the frunk if the battery goes flat, but would be hard to do in storage.

I appreciate any advice. I plan to get detailed and completely fill gas tank ahead of storing the car.

bkrantz

Perhaps pull the battery and leave it on a trickle charger elsewhere. (And leave the frunk open.)

Paliknight

Carrera-T

todd369

Bob Z.

That is what I would do, and you can always put it on a trickle charge elsewhere.

Antigravity

What is a few months? 3, or 5 or?

I have some suggestions... since you don't have wall power, if you start documenting your level of parasitic draw now, by the time you leave you can understand how much battery capacity you need to keep your car alive over your time away.
It is a daily driver now? If not you can see your discharge level after a week or two of not driving, or perhaps longer and get a feel for how long your car can sit without needing a charge or going dead. Just monitor the level of discharge.

Since you don't have access to a wall plug and just want to maintain the battery in a state that will not allow it to go completely dead, I suggest just buy a cheap Lead Acid Battery and stick it in the frunk positive to positive and negative to negative... Like a cheap 40Ah battery for a Honda Civic or something and allow that to assist your current battery to give is more Amp Hours. You can get some quite cheap batteries and once you know how long your battery can sit alone you can just ad another battery to get that extra capacity to carry you over. Yes you would have an extra battery but I think it better than just disconnecting you battery, and it eliminate needing a wall charger... this way nothing funky can happen when you get back. Its just ready to go. You could also make the connectino with some thing like 14awg wire since there is no real load once the car is in sleep mode and just sitting.

Also Keep the keys away from the car as they will tend to keep the system awake in the car.

And last if you have a friend with a phone that is willing to monitor your battery for you then we have a new blue tooth product coming out that can do that. They won't even have to access your car.... and it would give them the ability to tell you what you car battery is doing because if they walk within 30 ft of the car or outside the garage all the data is transmitted to them.

Here is the link and video...
https://shop.antigravitybatteries.co...acker-lithium/



I'll post about it tomorrow... just finishing the video...

Mr. Turtles

kuma1416

You can partially open the hood without draining the battery. Just lower the hood gently until it rests in the latch. The trunk light will stay on for around 5 minutes then go out.

bkrantz

A typical 12 volt auto battery can lose a few percent of charge per week. Plus if the voltage drops enough, the battery can be permanently damaged.

pfbz

Leaving the frunk popped shouldn't be a problem. Most modern Porsche's will turn off the frunk light after some timeout period, just check it now and make sure. Or pull the bulb.

Jim137a