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      10-26-2016, 06:58 PM   #1
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M2 Battery Charger

In preparation for winter storage, I wonder what battery charger/trickle to use? Is the BMW OEM any good?

Also, is the M2 battery Li-ion?

Thanks for your help!
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      10-27-2016, 03:25 PM   #2
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Got the answer from my local dealer service department.

The M2 can use any AGM battery charger 2A/5A/15A automatic (also good for lead batteries).
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      06-06-2017, 03:35 PM   #3
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How about a ctek 4.3 test and charger? I think BMW sells just the standard 4.3.
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      06-06-2017, 04:24 PM   #4
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Quote:
Originally Posted by Sman View Post
How about a ctek 4.3 test and charger? I think BMW sells just the standard 4.3.
I think it could work, but don't go crazy. I paid mine 50$ and was recommended by my BMW Tech. BMW sells one for 200$!!!
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      06-11-2017, 08:32 PM   #5
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Quote:
Originally Posted by Benzima View Post
Quote:
Originally Posted by Sman View Post
How about a ctek 4.3 test and charger? I think BMW sells just the standard 4.3.
I think it could work, but don't go crazy. I paid mine 50$ and was recommended by my BMW Tech. BMW sells one for 200$!!!
I went with the new ctek 5.0 charger only $92
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      06-13-2017, 10:27 AM   #6
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I've always used these on my BMW's without issue:

https://www.amazon.com/Battery-Tende...battery+tender
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      06-13-2017, 06:25 PM   #7
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As long as you don't have lithium ion you can pretty use any charger/maintainer. There is a specific one BMW has for the LI batteries.
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      06-17-2017, 09:28 PM   #8
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So the m2 has a lead acid battery. Only the m3/m4 have the new lithium battery?
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      06-18-2017, 06:13 AM   #9
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Quote:
Originally Posted by Sman View Post
So the m2 has a lead acid battery. Only the m3/m4 have the new lithium battery?
Could be others. You have to look at the battery.
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      06-18-2017, 08:28 AM   #10
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Lets say you look to see what type of battery you have what is one way to tell the type of battery? I don't think the battery simply is labeled lead acid.
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      06-18-2017, 01:22 PM   #11
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If it's an LI battery is says it right on the top.
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      06-28-2017, 01:17 AM   #12
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Always go CTEK.
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      08-17-2017, 07:33 PM   #13
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Quote:
Originally Posted by DivideBYZero View Post
Always go CTEK.
Which model are you using? If not a daily driver and stored in winter for example.
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      08-18-2017, 09:06 AM   #14
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Quote:
Originally Posted by M2Nebula View Post
Which model are you using? If not a daily driver and stored in winter for example.
I used this one all last winter. Car was just stored, not turned on for 3-4 months.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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      08-18-2017, 09:46 AM   #15
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Quote:
Originally Posted by Joaozao View Post
I used this one all last winter. Car was just stored, not turned on for 3-4 months.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Thank you! Just ordered one. Had been reading on the CTEK site and it offers what I need and at a good price, especially from Amazon. It will work on my motorcycles as well, I'm psyched!
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      08-18-2017, 06:36 PM   #16
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Quote:
Originally Posted by M2Nebula View Post
Which model are you using? If not a daily driver and stored in winter for example.
Can't remember. It's tending my Z3 right now.
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      11-06-2017, 10:42 PM   #17
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Does anyone know if there would be a huge problem setting the charger to either the agm mode versus just using the normal mode for the m2? I know that agm provides slightly more voltage output.
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      12-23-2017, 02:10 PM   #18
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What mode do you set the CTEK on for extended storage? I read the instruction manual, but I am not sure.
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      12-23-2017, 09:58 PM   #19
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Quote:
Originally Posted by CHITOWN1series View Post
What mode do you set the CTEK on for extended storage? I read the instruction manual, but I am not sure.
I put mine in winter charge mode, has the snow flake icon.
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      12-24-2017, 01:53 PM   #20
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Quote:
Originally Posted by BMWPWR18 View Post
Quote:
Originally Posted by CHITOWN1series View Post
What mode do you set the CTEK on for extended storage? I read the instruction manual, but I am not sure.
I put mine in winter charge mode, has the snow flake icon.
My car is in a warehouse that is heated. So would I just do the regular setting then?
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      12-26-2017, 08:07 AM   #21
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Quote:
Originally Posted by switlikbob View Post
I've always used these on my BMW's without issue:

https://www.amazon.com/Battery-Tende...battery+tender
Yep same here...had it from my old motorcycle road racing days and never sold it.
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