I would say the easy fix is to take it for a drive once a week for giggles , you have time , the vehicle depreciates regardless if you use it or not , and no special actions are needed then to quell your worry on a 12 v batterycove3 wrote:After replacing my BMW 528E and 525I 12V batteries every few years, I was told by BMW to use a trickle charger to the cigar lighter if a car is not driven much, which was the case my being retired. The battery life is reduced if they are undercharged from lack of driving. The batteries draw some current constantly even if the car isn't used, and I found myself charging them from dead with a charger..
I'm wondering about the e-golf battery when the car isn't driven much. With the snow I haven't used it for over a month:
1. The manual says the battery will drain if not driven for long periods, the doors are unlocked, or lights left on
2. It appears the 12V battery is charged from an alternator while driving
3. The battery capacity is small as it's not needed for starting like an ice, so the safety margin is less
4. The manual says only the dealer should charge it and that the dealer has to reset things when changing a battery
5. There doesn't seem to be an indicator for the 12V battery state of charge
This leaves 3 questions:
1. Is it really necessary for the dealer to charge the battery.
2. How to tell if it's in the danger zone of discharge?
3. Is it safe to use a trickle charger through the cigar lighter as with my ICE to to be on the safe side?
Comparing the batteries of my eGolf and my gasoline-powered Alltrack, the eGolf's battery isn't a whole lot smaller. It appears to use the same battery tray as the ICEV versions so when the eGolf's battery dies you can put in a standard size replacement; there's even a third bolt hole for it. It's also bigger than the battery I remember from my Leaf, which is quite small, but appeared to be the same size as the battery on my 1982 Honda Accord.cove3 wrote:While it's true there's no start load as with an ICE, this also allowed VW to use a small battery so concerns still exist
I've left my car at an offsite airport parking structure for 3 weeks, and had no problem turning on the car upon my return.There's nothing in the manual as to how long the car can be sitting idle before the 12V battery drains below a safe thresh hold. 3 weeks, 2 months?
If it makes you feel better, use the trickle charger. If it's a true trickle charger and it is working properly, it won't overcharge your battery.Nor is there any easy way to test the capacity or state of charge to know whether to use a trickle charger.
Not sure on the eGolf, but that was NOT the case on the Leaf. In fact, leaving a Leaf plugged in for far too long actually drains the 12 volt battery.Does the 12V battery get charged when you charge the main battery? If so, and the main battery is at 50% for storage puroses, I could charge it to 80% in order to top up the 12V battery
On my Alltrack (which I rarely use) I just leave the hood down but not fully shut; it's the same state if you pull on the inside hood release lever but don't open the hood. That also serves as a reminder that I need to unplug the trickle charger.Looking in the engine compartment, there don't seem to be any openings in the grill to run a trickle charger through, so the hood would have to be up
You could, but I would think it's easier to attach a trickle charger if it will not be used for some time.If the 12V battery is charged by the car main battery, couldn't I just turn on the electric motor for a couple of hours?
Again if it makes you feel better, use the trickle charger.I called my dealer service and they said the 12V system is just like an ICE and is independent of the main battery system, and I could charge it with either a trickle charger or battery charger without loosening any battery connections
Please stop spamming us with your Bestekmall links.Rorence wrote:Thanks for you nice post. To charge battery with DC 12v to AC 110v 400w power inverter is easy to me. Since I have used this car charger for a long time. Simply to connect it with car cigarette lighter charger outlet. The advantage that I know about this tool is soft and convenient to take away. If you want to catch more information about it, you can click here to get. Best regards.
Yes, you're right. Car batteries can be drained if you leave electronics on when the car is parked or even when the car is unused for months. I often forget unplugging out my bestek 300w power inverter and just think that it doesn't matter if my phones or other connected things are plug out. While, after I do that for a long time, just found that I can't jump my car on the road. So, finally, I used a jump starter. The 4S store told me my car battery was damaged. But not so bad. So I have to remember to turn off the head lights and all my devices charged in car.tigger19687 wrote:There must be something wrong if you are going through 12v batteries like candy !?
If you are going to leave a car unused for more then or about a month I would disconnect it.
My trucks don't go through batteries unless I leave a light on or don't drive it for 4 months straight.
Not sure if you have Electronics in the car (navigator etc) that are not turned off ?
Or, like my son, who leaves things plugged in the lighter of the truck.
AGM is Absorbent Glass Mat. The Fiber Glass Mat absorbs the sulfuric acid in between the lead plates.Nick wrote:The 12v battery on my 2016 SEL is an AGM (applied glass mat). It has very low internal resistance and will not self-discharge substantially over several months. My car was in the garage for 7 weeks this summer, and started up normally when I got home.