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by MarkH
Thu Jan 02, 2020 12:35 pm
Forum: Technical BMW i3 Discussions
Topic: 12V battery
Replies: 47
Views: 3781

Re: 12V battery

Yeah, I think I may have been scared into taking unnecessary precautions. Reading back through the advice in the manual, it seems that it is aimed at ensuring the HV battery comes through a period of storage unscathed. If the DC-DC charger (of 12V battery) never activates unless the car is turned on...
by MarkH
Sun Dec 29, 2019 8:05 pm
Forum: Technical BMW i3 Discussions
Topic: 12V battery
Replies: 47
Views: 3781

Re: 12V battery

Thanks for all the replies. Art, I described disconnecting the battery in an i3 as a "nightmare" only because in an ICE there are no issues whereas with an i3 there are multiple warnings of dire consequences should you miss a step or do something wrong. One of the references given in the posts, abov...
by MarkH
Thu Dec 26, 2019 1:02 am
Forum: Technical BMW i3 Discussions
Topic: 12V battery
Replies: 47
Views: 3781

Re: 12V battery

From the manual: For idle phases that last several weeks, park the vehicle with a fully charged battery if possible. Do not park the vehicle for longer than 14 days if the electric range is less than 6 mls, approx. 10 km. With storage times of up to three months, if possible plug the vehicle into a ...
by MarkH
Wed Dec 11, 2019 10:06 pm
Forum: Technical BMW i3 Discussions
Topic: 12V battery
Replies: 47
Views: 3781

Re: 12V battery

I probably would do that, if I had an EVSE. I'm assuming that an EVSE has more smarts than just a domestic AC outlet. I also assume that the in-line charging unit that I use to recharge the vehicle from my domestic supply will automatically stop charging once the battery is at 100%. What I don't kno...
by MarkH
Wed Dec 11, 2019 12:07 pm
Forum: Technical BMW i3 Discussions
Topic: 12V battery
Replies: 47
Views: 3781

Re: 12V battery

Hey Art.
Thanks very much for all that advice.
I know I would be a nervous wreck to find out all of that while doing it for the first time.
Very very helpful. :-)
by MarkH
Tue Dec 10, 2019 11:50 pm
Forum: Technical BMW i3 Discussions
Topic: 12V battery
Replies: 47
Views: 3781

Re: 12V battery

OK, if I'm going to be storing the car for 2 months then my best course of action is 1 - disconnect the high-voltage system from the 12V system. 2 - disconnect the 12V battery negative terminal. Is that it? Does everything work again on reconnection without doing anything special? Also, if I'm needi...
by MarkH
Tue Dec 10, 2019 6:48 pm
Forum: Technical BMW i3 Discussions
Topic: 12V battery
Replies: 47
Views: 3781

Re: 12V battery

If you left it plugged into an EVSE, over that two months, it might activate the EVSE 3-4 times, if that, but enough to keep both batteries charged. Unlike a cellphone or most other consumer battery powered devices, the car is not getting a constant charge while connected...it only turns on once th...
by MarkH
Sun Dec 08, 2019 11:52 pm
Forum: Technical BMW i3 Discussions
Topic: 12V battery
Replies: 47
Views: 3781

Re: 12V battery

Thanks for that reply, Art.
Woah! It all looks pretty intimidating :?
My BEV is 2016 - maybe we don't need to disconnect the HV?

You say you disconnect the 12V before putting the car in storage.
We will be leaving the car unused for two months next year. Is that long enough to warrant doing this?
by MarkH
Sun Dec 08, 2019 8:50 pm
Forum: Technical BMW i3 Discussions
Topic: 12V battery
Replies: 47
Views: 3781

Re: 12V battery

I would disconnect the high-voltage disconnect and the 12 V negative battery cable so that I could attach a 12 V battery charger for a few hours Since I have a 12V charger, this sounds like a reasonable solution to getting going again - even if it's just so I can get the car to a dealer to replace ...
by MarkH
Sun Dec 08, 2019 3:56 pm
Forum: Technical BMW i3 Discussions
Topic: 12V battery
Replies: 47
Views: 3781

Re: 12V battery

So, if the trickle charge gets it back up so I can start the car, will the car run OK until the next time I stop and try to re-start it? ie, do I have just one shot at driving to the nearest BMW shop - 100kms away for me? How long are people getting out of their 12v batteries before they die? What s...

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