Michigan 992

My 992 has the lithium battery so I got a new charger given to me by my Porsche dealer. I am interested in knowing if any of you are having the same issue that I am since I put my car up for the winter.

The charger starts charging fine then after a random period between a few hours and a week it will stop charging until I power up the car and I am assuming the power port in the footwell where the charger is plugged in. Has anybody else run into this? Is there a simple fix without taking the car to the dealer? For now it seems like I will have to reset it every week or so to keep the battery charged.

Thank you in advance for your advice.

GrantG

Hopefully, they gave you a charger designed for Lithium Ion batteries (different voltage and charging protocol). Secondly, yes, the charging ports sometimes time out. I prefer to connect the charger directly to the battery (can hardwire pigtails to the battery terminals with a connector that connects to the charger) - requires lifting the frunk to connect. You'll find threads about this on the 991 board.

Michigan 992

Yes it is the charger which has a lithium selection option. I did not see an easy way to route wires out from under the battery cover and assumed Porsche made the power port and charger fully compatible with each other.

If somebody has pictures of how they routed the wires in their 992 it would be much appreciated. Seems like there is more clearance in my friends 991’s around the cover in the drunk.

WCE

I've searched for a definitive answer as to whether or not the under dash socket allows long term charging or not and have read: absolutely not, only if the car is locked, only if you have the smoking pkg, and always allows charging... Since the Porsche accessory charger includes a plug you would think it would be compatible!
I personally plan on hard wiring to the battery which is easy and definitely the preferred connection method.

1RedHead

Routed the pig-tail through the vents as the leads are not long enough to bring out the sides of the cover. Still can raise the cover enough and sit it back on the windshield as necessary.

gcurnew

I have a related question so not a total thread hijack. All the lithium booster packs I can find (including my NOCO GB70) are for lead acid batteries only. What would one use to jump start a Porsche Lithium battery?

Michigan 992

1 RedHead thank you

JHesketh

I’ll post a picture when I am home but I asked my dealer to put in the direct to battery lead like 1redhead.

The dealer routed it out through the utility box (for tyre repair kit) to the right of the frunk as you look at the car so it’s all squared away when the car is not charging.

am also using the Porsche charger with Li Ion capability which I believe is a rebadged CTEK unit.

tcirillo

i am very interested in this topic as i will be storing my 992 for 6 months a year, unattended. i had planned to use the port inside the passenger footwell, and didn't know i needed anything more than one of my smart chargers. if this is not possible, i'm in a pickle.

can someone confirm that there is no solution to using the inside port, unattended (meaning, no weeekly intervention)? thank you

G650

On a related issue, does anybody have experience with the car’s ability to hold charge for a 3 -4 week period? I have a 992 C2S with Rear Axle Steering, which I’m told comes with the LiOn battery. I used to leave my previous M3, which had a NiCad battery, for similar periods and it was OK.

Michigan 992

My car is is of a similar configuration with RAS. After two weeks at 50 degrees stored unlocked the battery had a near full charge. 4 weeks is unlikely to be a challenge unless it is very cold

mathus7

Does locked or un-locked make a difference?

jkautz

I’m under the impression it can be connected under the dash, and once the car is locked. It will keep the charge.

Michigan 992

When the car is locked it powers a number of alarm/anti-theft features unless they are deselected. I seem to remember there is a way to do this in GTK. I don’t think they radically increase battery drain, but we have always stored cars unlocked that had these devices. The ones from one different German company had active motion detection running and that took a fair amount of battery power.

If if you don’t need the alarm where the car is being stored I would leave it turned off or not locked.

Antigravity

The general short answer here would be none...if a lithium battery is "over discharged" only an intelligent lithium charger like the CTEK JHesketh (yes you are correct in that it's just rebranded) mentioned should be used. If a lithium battery is jumped in an over discharged state the stock charging system on any vehicle is going to charge the battery too fast and ensure damage and in a worst case scenario could lead to thermal runaway....Now that being said there are some batteries like our automotive line that have protections built in which should prevent the battery from ever getting over discharged, as long as the residual charge is around say 11v or higher you should be okay jumping it...being that ours actually has built in wireless jump starting this is something you would never need to worry about.

Another advantage with a lithium battery is that it has an extremely much slower discharge rate then the lead/acid counterpart so provided there is minimal parasitic draw it should be able to sit for a much longer duration.

Please feel free to check out ours below.
https://antigravitybatteries.com/pro...tive/ag-h6-rs/