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M2 Technical Topics > Mechanical Maintenance: Break-in | Oil & Fluids | Servicing | TSB | Recalls > battery tender??

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      12-19-2016, 09:33 AM   #1
smoothM2
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battery tender??

I'm storing the M2 for the winter and am about to pull the trigger on this charger from amazon...

https://www.amazon.com/CTEK-56-864-A...le+charger+bmw

Is this the correct one for the M2? I'm assuming we don't have a lithium ion battery like the M3/M4s.
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      12-19-2016, 12:48 PM   #2
SupraSaiyan
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That CTek and Battery Tender Jr. are both good. If you prefer a higher end tender, go with CTek.
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      12-31-2016, 03:54 PM   #3
DivideBYZero
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CTek.

And the M4 has lithium Ion?! I thought all BMW batteries were AGM.
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      01-01-2017, 01:16 PM   #4
MTHRAR
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Quote:
Originally Posted by smoothM2 View Post
I'm storing the M2 for the winter and am about to pull the trigger on this charger from amazon...

https://www.amazon.com/CTEK-56-864-A...le+charger+bmw

Is this the correct one for the M2? I'm assuming we don't have a lithium ion battery like the M3/M4s.
I have the CTEK Test and Charge - Literally the same charger you have linked, but has extra features for testing the alternator, starter, and battery and it works great. Make sure to use the "Snowflake" mode as it's made for AGM batteries (what our M2s have).
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      01-02-2017, 11:11 AM   #5
Ceeto
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I just checked on my tender and it looks like it only outputs 750mA. I think most of the ones you guys have are 2-4A

Is this lower output going to be a problem? I would just think it would take longer to fully charge, but since I'm just 'tending' the battery for a few months it should be ok, right?
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      01-02-2017, 02:04 PM   #6
egalutan
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Your BMW dealer should have the battery tender device. Mine came with it,it's called battery tender plus. It was all installed where the battery is. All I did was plug it in. It charges the battery to full charge, then
it goes into a float state to maintain the charge. I paid 199$ CDN dollars as part of car configuration.
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      01-02-2017, 06:19 PM   #7
Ceeto
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Thanks. I see the BMW one outputs 1.25A

Do you think I'll be ok with one that outputs just 750mA?
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      01-19-2017, 05:04 PM   #8
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The one I purchased was also from BMW it's made by Deltran and is a 5 amp unit. The instructions recommended to use posts under the hood and not the battery terminals in trunk, no explanation given.
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      01-21-2017, 09:24 AM   #9
MSULLY
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I have the CTEK charger, works great. Purchased from Amazon for $68.97 with free shipping. https://www.amazon.com/CTEK-56-864-A.../dp/B006G14FK8. I was amazed on how much my battery was drained after less than 1K on the odometer, this is a must have.
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