Mr.Speed

Seems here is first consequences of the lock-down... Today decided to start my C4S, but seems battery completely dead...
How to open the doors?

I tried with driver doors mechanical lock... But it doesn't work...

Mr.Speed

Very strange... I unlocked the driver door with mechanical key but can't open... Go check to try open passenger door and they opened... Can't understand how! But happy that i got in the car...
Car i didn't used only for one month and battery completely dead...

992Sam

maybe you have to call Porsche assist to come jump start it?

WCE

Battery shouldn't run down in a month unless it was low already when you stopped driving it.
Strange about the drivers door lock - so the mechanical key lock operated the power locks and unlocked the passengers door?

detansinn

If you're letting a modern car sit for more than 2-3 weeks, you need to put it on a trickle or maintenance charger. It's true for almost any car at this point. When a modern car is turned off, it's still drawing from the battery.

I have been taking my C4S out once per week for miscellaneous grocery errands and driving it long enough (ie. >50 miles) to ensure a full charge.

Richard_Wallace

This is correct detansinn. If you have the Porsche app on your iPhone. You can check it - and you will see it updates frequently (milage left, current alarm status, locked or unlocked, windows up or down, etc.). These things, especially if locked with alarm on.. 2-3 weeks left without starting or charging is not good for most modern cars as most are still in standby, not hibernating.

My McLaren 720s will last about 3 weeks without charging, I leave it on trickle charger when I park it.

Also be careful, as my 992 has a Lithium Ion battery, you need to be careful on both the type of charger and jump starting it - they are a bit different than a normal battery.

Mr.Speed

Maybe i forgot to lock a car... When i left in garage... But i can't open a drivers door anyway... So still can't understand whats happened... As i see that side mirrors wasn't in parking position. Maybe unlocked car drawing more current than locked...

But seems yes, the battery maintainer is a must have for this cars... Never had any problems with battery and have 12000 km driven with the car already.

OmniBlade

I had the battery die while dialing in my dash cams battery saver settings and sitting a week without a drive.

I had a hard time getting the key to unlock the drivers door but after going both ways for a couple minutes it just opened. Was able to use the emergency jump plug in the drivers fuse to pop the front trunk and then jumped it.

stevensivak

What is the "process" for hooking up a tender?

Mr.Speed

I was checking that info all day, seems can use 12v socket on the passengers side... So ordering CTEK battery maintainer... Seems the batter will die after 2-3 weeks, as one of the members already said.

eagle1960

If you do a search you will find where this has been previously covered and options folks are using. Seems the footwell plug is no longer an option since it disconnects after a short time and will no longer allow charging. I connected my charger directly to the battery terminals and ran the pigtail out an opening in the plastic cowl cover in the frunk.

Mr.Speed

Thanks! I was reading info from 991 forum... You used battery terminals? Or the negative terminal on the chassis?

eagle1960

Battery terminals. Rings on the pigtail fit the clamping bolts perfectly.

Seacil

A word of caution here for those with a Lithium Ion battery. With the Porsche battery maintainer having a lithium mode , I've not be able to have it remain on line, either through the 12v port or directly to the battery for more than a day or so. No problem with my 991.2 (non Lion) remaining on line even if not producing a charge . I haven't received much guidance about this issue from the local dealer, and even CTEK couldn't help much. Since I'll probably be remaining put for the summer, I may not be able to see how this fully plays out.

eagle1960

My 992 doesn't have a lithium battery but I have a lot of experience with other uses and charging. The way I read the Ctek info, is that it should be a connect and forget operation. You will not see a floating charge like for a lead acid battery. Lithium batteries don't like that.