KarlC
Posts: 44
Joined: Wed Nov 27, 2019 1:15 pm
Location: San Diego Ca

Re: 12V battery

Fri Jan 03, 2020 10:23 am

We have a 2015 BMW i3 Rex, its looks to be 1st sold in 1/2016, so far we have not had any 12V battery issues that we know of but I am thinking we should replace it sooner that latter.

I plan a DIY so what the current best 12V battery, and can it be bought on Amazon ?

Thx.
2015 i3 Rex, Arravani Grey, Tera World, Technology, Driving & Parking Assistant, Harman Kardon Audio System, 19" wheels

User avatar
MKH
Gold Member
Posts: 568
Joined: Fri Nov 02, 2018 5:48 am
Location: Dallas

Re: 12V battery

Fri Jan 03, 2020 11:16 am

None on Amazon.

It takes the AUX18L Deka/Remy brand battery made by East Penn Manufacturing only - no substitutes. They have distribution warehouses around the country the battery can be purchased at over the counter. In the San Diego area:
East Penn
2709 Via Orange Way
Suite B
Spring Valley, 2709 Via Orange Way 92108
Phone: 619-660-0016

You can also buy it online here: https://www.remybattery.com//start-stop ... KsQAvD_BwE.

If you look at the label of the original battery, you will see the 'E.P.M. Products' (East Penn Manufacturing), and the address of their headquarters - 1 Deka Road, Lyon Station, Penn.
Deka.jpg
Deka.jpg (44.93 KiB) Viewed 558 times
Mark H.
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch 427 wheels, EVoInnovate EVSE

Ranamohamedshawky
Posts: 3
Joined: Sat May 23, 2020 11:09 am

Re: 12V battery

Sat May 23, 2020 11:21 am

What is the marks that shows that the 12v battery has a problem i am having a icon showing about the battery discharging while stopped and is the 12 v battery has any relation about the car's charge ? Because it sopped while iwas driving it while it has 7 kms left!

Ranamohamedshawky
Posts: 3
Joined: Sat May 23, 2020 11:09 am

Re: 12V battery

Sat May 23, 2020 11:21 am

What is the marks that shows that the 12v battery has a problem i am having a icon showing about the battery discharging while stopped and is the 12 v battery has any relation about the car's charge ? Because it sopped while iwas driving it while it has 7 kms left!

jadnashuanh
Posts: 4916
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: 12V battery

Sat May 23, 2020 1:19 pm

If the 12vdc battery is toast, you won't be able to use the vehicle at all! All of the lights, computers, locks, etc., rely on the 12vdc battery. Once the vehicle IS in ready mode, the main battery comes into the picture and will try to maintain that 12vdc battery, but that only happens if the car is in ready, or can get there. Well, there is some stuff going on while charging with an EVSE, but charging the main batteries can't happen unless the 12vdc one is sufficiently charged, either. FWIW, there is a bypass, trickle charge emergency mode to try to get the 12vdc battery voltage back up, but it can take awhile...until that happens, you can't charge the main batteries or drive the thing.

People have reported all sorts of weird issues when their 12vdc battery was getting marginal. If yours is getting more than 4-years old, it might be time to consider replacing it before it fails. I should do that to mine, but haven't yet.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV

alohart
Posts: 2023
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: 12V battery

Sat May 23, 2020 5:32 pm

jadnashuanh wrote:
Sat May 23, 2020 1:19 pm
Once the vehicle IS in ready mode, the main battery comes into the picture and will try to maintain that 12vdc battery, but that only happens if the car is in ready, or can get there.
Actually, the high-voltage system including the DC-DC converter that charges the 12 V battery is turned on when an i3 enters any of its 3 states:

  • radio readiness: some electronic systems/power consumers are ready for operation
  • operating readiness: all electronic systems/power consumers are ready for operation
  • drive readiness: all vehicle systems are ready for operation

So if the 12 V battery is charged enough to allow the doors, frunk, or hatch to be unlocked or opened, charging of the 12 V battery would commence as shown on the 12 V voltmeter installed in the auxiliary power port below the center of our i3's dashboard.

During COVID-19's stay at home period, I've been taking advantage of this fact to keep our i3's 12 V charged by sending a door unlock followed by a door lock command from the BMW Connected app. Our i3 is parked 2 floors down and ~150' away from our apartment in our apartment's parking garage, so unlocking/locking the doors in person is not as convenient.
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

leocelli
Posts: 5
Joined: Thu Dec 01, 2016 6:01 pm
Location: Brazil
Contact: Website

Re: 12V battery

Sat May 23, 2020 5:37 pm

Here in Brazil I used this solution:
https://youtu.be/VX5AqfhLdtk

JohnWasser
Posts: 47
Joined: Sat Mar 07, 2020 6:15 pm

Re: 12V battery

Sat May 23, 2020 7:27 pm

I bought the Remy AUX18L from https://www.remybattery.com/start-stop- ... ttery.html. The price is $121.95 but shipping and handling (to Massachusetts) brought the total to $140.20

Amazon has a "Replacement For Deka Aux18l This Item Is Not Manufactured By Deka" for $338.23

Walmart.com shows the Deka AUX18L as "Out of Stock" at $303.26

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