if you have a secured, private garage - don't set the alarm system (this draws additional power)I have a new 2022 boxster gts two months ago delivered so battery is brand new. Im leaving for vacation on a Tuesday and can have my son start the car (not drive it cuz he’s not insured) on Friday thru Sunday morning and then again the next weekend on Friday thru Sunday and then im back on Tuesday. So the car will not be driven for 13 days straight but not started up for no more than 4 days straight.
Do i need to connect the car with a battery charger i have the porsche original one. I prefer not to because nobody will be home and am worried for malfunctioning and fire hazard.
If i come back and the car doesn’t start if I connect the battery charger will that fix it?
Not driving for two weeks and not using a battery charger will likely not damage a good AGM battery. Not driving for two months might, or might push it closer to its end if it is already old. I would not think using a charger over a two week span is required. But I think those here who go for three or four months that way may end up replacing their fairly expensive batteries sooner than the expected lifespan of an AGM battery would dictate. Just because it starts when you finally get back home doesn't mean it is just as fine and healthy as when you parked it.In other words not driving for two weeks and not maintaining the battery with a charger during that period shortens the battery life ? And using a charger during those two weeks is better for the battery’s life soan?
Never. See above.When do you use the charger?
If I am reasonably certain that I won't be driving the car for two or more weeks I hook up a tender.So what’s the mode of operation regarding the charger to get more from the battery for more years?
@Barryng provided a veritable treatise on batteries. I use an AGM tender on our AGM batteries.Are you saying that you are using an AGM charger on the factory wet cell battery?
Our cars will go into a "sleep mode" - at least when left unlocked - such that they can sit for several months and still start.Our cars cars have a lot of background uses for electricity when not running. I suppose that might depend on what services the car does or doesn't have. I know that I have occasionally gone for two weeks without driving, and when I put a battery charger on it the display said it has around 50% or even a bit less.
Again... not a charger.In other words not driving for two weeks and not maintaining the battery with a charger during that period shortens the battery life ? And using a charger during those two weeks is better for the battery’s life soan?
Yup. But, do not expect that the battery will last for more than 6 to 8 years. If it's already 8 years old then expect it to die any day now.My Boxster usually stay in parking for the whole winter 3-4 months w/o battery maintainer and still can start the car after that.
You may be quite right on that. Running the alarm system with its internal motion sensor is certainly one power draw. But then, running the receiver to detect the wireless key fob also takes power. Running the telephone receiver to respond to Car Connect queries also must take some power. More importantly to me and presumably to you too, I would never leave the car unlocked, especially for an extended period, unless it was in a locked garage.Our cars will go into a "sleep mode" - at least when left unlocked - such that they can sit for several months and still start.
This. If I'm not driving it for more than two weeks, on goes the CTEK. The amount of over thinking some people do on this topic never ceases to amaze me. Worf did a great job at patiently explaining the nuisances in terminology but it likely won't get read by many.This topic is dense !
I use a ctek charger when I travel away for more than 2 weeks. In fact I have the same ctek model in my order 2013 BMW and battery works perfect.
Very true, which is why when I have the car in my locked garage, I double click the lock button to arm the alarm "without" activating the internal motion sensor. That is an option for those of you that didn't know it existed.Running the alarm system with its internal motion sensor is certainly one power draw
I have this I imagine it’s what you call a maintainer? From everything I’ve read on this thread I can’t find any negative issues with using a maintainer even if the car stands for two weeks only when im on vacation to be on the safe side ? Your opinion?First let's do terminology:
- Battery Chargers
- Trickle Chargers
- Battery Tenders/Maintainers
Chargers are only used to "charge" batteries. Tenders/Maintainers are used to maintain batteries and will never(*) overcharge.
(*) I have personal knowledge that a damaged tender/maintainer will kill a battery. So, don't use them for hammers.
What I write below is applicable to Tenders/Maintainers. Only. Unless I specifically write Charger.
Never. See above.
If I am reasonably certain that I won't be driving the car for two or more weeks I hook up a tender.
We've nine cars and only one commuter so most of the cars are on tenders most of the time.
The wife's commuter 991S is equipped with front/rear cameras that run in parking mode all of the time when parked. That mode, with the installed optional radar-activation is pretty miserly with parasitic draw. I did the calculations when I put it in two years ago and it should be totally fine for 2 to 3 weeks. (Without the radar-activation the figure is about a week, sitting.)
On the weekends, I put it on a tender.
The truck (Macan) always sits outside and is generally operated once or twice a week. About once a quarter it gets "electron therapy" - I hook it up to a charger for a few hours and then swap for the tender for a day-ish.
The Macan's battery is 7 years old at this point. Given how it's treated I do not expect it to last too much longer. But, we'll see.
@Barryng provided a veritable treatise on batteries. I use an AGM tender on our AGM batteries.
Note further than an "old-school" smart non-AGM tender will maintain an AGM battery. It just won't be as quick to reach maintenance mode. But, even so, I mostly use AGM tenders on the AGM-equipped cars.
Our cars will go into a "sleep mode" - at least when left unlocked - such that they can sit for several months and still start.
I've accidentally left one of ours off a tender for a three-ish months and the only evidence was the "auto-start/stop off" warning. However, our cars are unlocked when in the garage. I have no data on how long they can sit locked and then still start.
There is a "transport mode" than can be set with PIWIS that, I suspect, minimizes parasitic draw at the expense of convenience (Entry and Drive, etc.)
Let me add that, with the exception of the Macan, none of our cars are equipped with Entry and Drive.
Again... not a charger.
If you only drive your car every two weeks and then only for a short period then, in my opinion, yes you will shorten the life of your battery if you don't keep it on a maintainer.
Yup. But, do not expect that the battery will last for more than 6 to 8 years. If it's already 8 years old then expect it to die any day now.
If everyone goes back and re-reads @Barryng's post the between-the-lines implication is that starting and driving a depleted battery will cause damage to the battery. If your battery is at 50% and you drive around you will expend some of its calendar life. Even AGM batteries are subject to damage from mechanical shock (vibration, boucing from driving) when in a far-from-topped-off state.
The surest way to kill a battery dead is to discharge it fully, then charge it just enough to start the car and then drive away. 100% of the time you will kill the battery or at a minimum greatly shorten the battery's life. For the old pre-AGM batteries it was 100%. For the AGM batteries? I have no data.
If you forget to put a tender on your battery for a couple of months, then I consider it best practice to top it up with the tender before starting the car.
Yup. That’s a tender/maintainer. It’s one of the CTEKs with the expensive Porsche logo.I have this I imagine it’s what you call a maintainer?
A tender/maintainer will not hurt anything. If you want to hook it up every time you stop the car you will not hurt anything.From everything I’ve read on this thread I can’t find any negative issues with using a maintainer even if the car stands for two weeks only when im on vacation to be on the safe side ? Your opinion?
Of course. When any of ours are unattended outside they are locked. But, with the exception of the truck they are almost always on the road or (unlocked) in the garage.… I would never leave the car unlocked, especially for an extended period, unless it was in a locked garage.
Raven, are you saying your top has been down for 2 months? I ask because I'd be concerned in doing that with the top developing some pretty major creases that would take a long time to work out.
What are your battery voltages at year 6? Mine is year 5 and I'm starting to see some decline. Was 14.3 while driving and in recent weeks has slipped to 14.1. I typically drive the car mostly on weekends for short distances and when not driving it, I always use the CTEK battery tender. I took my car into the dealer 2 weeks ago for its annual oil change and 27 point check. I asked them to test the battery life and I was told they did that and it is near end of life. I was quoted something like $837 for a new AGM battery.Unproven rumor has it that regular use of an AGM smart charger might extend the life of the OE battery. Maybe yes, maybe no, but I'm on year 6 of the OE battery and voltages are still good; Varta.
I participated in a previous blog regarding tops and creases. On the few occasions I've put the top up no creases have appeared. I'll take some photos Saturday and post them.Raven, are you saying your top has been down for 2 months? I ask because I'd be concerned in doing that with the top developing some pretty major creases that would take a long time to work out.