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      10-05-2018, 03:02 PM   #1
jaye944
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BMW battery tender - advise on use

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Last edited by jaye944; 10-05-2018 at 05:28 PM..
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      10-05-2018, 03:11 PM   #2
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I'd use the terminals in the engine bay. Too much bad things can happen when moving battery terminals. I only do that when it's a must - like changing the battery.

You can set the charger on the intake manifold and route the power wire thru the cowl area. Just watch for places it could get cut when closing the hood. I'd let the engine cool down before placing the charger in the engine compartment.
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      10-05-2018, 03:23 PM   #3
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Quote:
Originally Posted by jaye944 View Post
Thanks man, I'm guessing that's what I had already been thinking in the back of my mind.

But txs for the confirmation.

I understand that is also the best place to jump start the battery.

Got it from a dealer today usually $160 odd, but had a loyalty card so got 10% or 15% off I'm sure I could have got something else better / cheaper.
But some research on line recommended the BMW one.

txs
I've got a CTEK which is probably what BMW branded ones are now. They used to use Battery Tender. Both are good and I've had mine for 2 1/2 years.
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      10-05-2018, 03:34 PM   #4
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I do #1, connect under the hood. It's convenient for a variety of reasons as you already know. It's such a low power device connected to something designed to jump start the car I can't think of any reason it'd possibly be a bad idea. I do connect mine there before plugging it in however, to be sure there are no sparks, even though i know I don't have fuel leaking all over the engine.
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      10-05-2018, 03:56 PM   #5
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just make sure you connect and disconnect a battery charger only with the battery charger switched OFF

Connect the charger to engine compartment B+and ground.
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      10-05-2018, 04:29 PM   #6
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There is a large terminal just next to the coolant expansion that is better for the charger's ground cable. Makes it easier to close the hood.
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      10-05-2018, 07:38 PM   #7
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The car in this short video is an E92 M3 but it's the same for the 1 series, for anyone who's interested.

I have a CTEK as well and use it on a regular basis.

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      11-25-2018, 05:53 PM   #8
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Use a quality "Smart charger" from BMW, Deltran, C-tek etc. Connect only under the hood using the provided connections as shown in your Owner's Manual. Use your tender anytime the car won't be driven for more than a week and you'll never have a battery problem. Mine is connected continuously for 5 months during winter storage and the battery was still going strong when preventively replaced after 8 years.
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      12-14-2018, 07:54 AM   #9
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Is anyone using permanent mounting of ring terminals instead of the alligator clips? I was hoping to permanently mount it either under the hood or in the trunk and just run the connector plug up through the cowl or somewhere in the trunk for a quick connect and disconnect purposes.

I would prefer to run it under the hood and use the cowl so I am not running a cord into the trunk but the positive post does not have any accommodations for a permanent terminal. I thought about putting a bolt through it to mount a ring but was hoping for feedback first.

Any help would be appreciated.
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      12-14-2018, 08:45 AM   #10
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Quote:
Originally Posted by Unsavedone View Post
Is anyone using permanent mounting of ring terminals instead of the alligator clips? I was hoping to permanently mount it either under the hood or in the trunk and just run the connector plug up through the cowl or somewhere in the trunk for a quick connect and disconnect purposes.

I would prefer to run it under the hood and use the cowl so I am not running a cord into the trunk but the positive post does not have any accommodations for a permanent terminal. I thought about putting a bolt through it to mount a ring but was hoping for feedback first.
I bought an extension cable for my CTEK charger and this is what I did... Now I don't have to pop the hood all the time to connect:
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      12-14-2018, 10:54 AM   #11
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Thatís exactly what I was hoping to do. Where are you pulling power from?
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      12-14-2018, 12:37 PM   #12
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How did you get the o-ring on the positive charge point? i see a black plastic cover - does it just snap off?
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      12-14-2018, 01:47 PM   #13
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This is what I did before adding the extension cable... The black cover pops off:
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      12-27-2018, 08:34 PM   #14
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Quote:
Originally Posted by bmw1racer View Post
This is what I did before adding the extension cable... The black cover pops off:
That's a clean set up. I might have to look into doing something similar.

I connect to the red post and neg post in the engine bay. Connect to posts, plug it in, wait a few hours. I use a $25 Black & Decker I got at Home Depot. Works great.
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      02-22-2020, 12:46 PM   #15
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Quote:
Originally Posted by bmw1racer View Post
I bought an extension cable for my CTEK charger and this is what I did... Now I don't have to pop the hood all the time to connect:
Where did you get that cover/plug for the clip going up the hood? I want to mount mine permanently like this but donít want water/dirt getting on the clip
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      02-22-2020, 11:42 PM   #16
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Quote:
Originally Posted by mscdman View Post
Where did you get that cover/plug for the clip going up the hood? I want to mount mine permanently like this but donít want water/dirt getting on the clip
The cover for the plug was from the original cable... I reused it by cutting it off to use it on the end of the extension cable, which is why there's a tie wrap on the end.
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