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      01-02-2014, 08:38 AM   #1
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Hood Open or Closed for Trickle Charge?

Does it matter? I always seem to see hoods slightly popped (but not open) when trickle charging. If I close the hood is there any risk of the positive terminal touching something inside? Just never quite understood the rational one way or another.
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      01-02-2014, 09:00 AM   #2
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I don't think it makes a difference but my hood is slightly popped open because as you indicated I don't want to take a chance of the leads contacting the closed hood.

My car is also not locked when on the charger because I assume the hood has a switch for open and close that is linked to the alarm system and if this is the case then the next question would be
Is it okay to lock and arm the system if the hood is open?
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      01-02-2014, 09:13 AM   #3
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If you're going to do frequent trickle charging, I suggest using the quick release cable with the O-ring mounts that go on the battery terminals in the trunk. The trunk closes fine with the connection in place -- just be careful and don't slam it over the cable and it'll latch with a gentle push, and the alarm will arm as well. This is how I keep my car, and have no issues.
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      01-02-2014, 09:34 AM   #4
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I put a microfiber towel between my paint and the charger cable and allow the hood to "sit down" without latching. This reminds me the charger is hooked up and also makes it easier to disconnect the charger should I get a nice warm day in the winter.

Pic for reference:


Last edited by tjsabec; 01-02-2014 at 04:42 PM.
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      01-02-2014, 10:59 AM   #5
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My hood is popped. No issues whatsoever.
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      01-02-2014, 11:59 AM   #6
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You're hood does not have to be completely open id bet the latches would fail in the cold and slam shut.
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      01-02-2014, 12:01 PM   #7
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Quote:
Originally Posted by SMG M3 View Post
You're hood does not have to be completely open id bet the latches would fail in the cold and slam shut.
It does not have to be open, that is correct. Latches fail? The hood uses a strut. It is not going to fail due to being open.
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      01-02-2014, 12:12 PM   #8
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Quote:
Originally Posted by alee0729 View Post
If you're going to do frequent trickle charging, I suggest using the quick release cable with the O-ring mounts that go on the battery terminals in the trunk. The trunk closes fine with the connection in place -- just be careful and don't slam it over the cable and it'll latch with a gentle push, and the alarm will arm as well. This is how I keep my car, and have no issues.
I thought BMW advised against charging directly to the battery and to use the terminals under the hood instead. Something to do with the intelligent energy management system or something?
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      01-02-2014, 01:33 PM   #9
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I completely close my hood when I charge my battery, no issue at all.
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      01-02-2014, 05:17 PM   #10
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I leave mine unlatched but open. No issues leaving it completely open. Careful fully closing it as you may hurt the wire. Not a problem using the engine jump terminals.
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      01-02-2014, 07:13 PM   #11
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I have a cheapo harbor freight trickle charger... is that safe to use on our cars? How long do trickle chargers generally take to complete a full charge if the battery is relatively low?
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      01-02-2014, 07:14 PM   #12
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Quote:
Originally Posted by Rupes View Post
I thought BMW advised against charging directly to the battery and to use the terminals under the hood instead. Something to do with the intelligent energy management system or something?
You should never jumpstart at the battery, but for trickle charging, it is completely fine.
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      01-02-2014, 07:19 PM   #13
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Quote:
Originally Posted by gazosnic View Post
I have a cheapo harbor freight trickle charger... is that safe to use on our cars? How long do trickle chargers generally take to complete a full charge if the battery is relatively low?
About 12-14 hours.

As long as the charger knows when to stop, it's fine. Trickle chargers aren't just about putting energy back in the battery, but also to change the pace of charging and knowing to stop when full. Ctek and Deltran are the two most popular ones out there... they're often sold rebranded by car manufacturers as well.
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      01-02-2014, 07:27 PM   #14
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Quote:
Originally Posted by alee0729 View Post
About 12-14 hours.

As long as the charger knows when to stop, it's fine. Trickle chargers aren't just about putting energy back in the battery, but also to change the pace of charging and knowing to stop when full. Ctek and Deltran are the two most popular ones out there... they're often sold rebranded by car manufacturers as well.
Spot on ! My CTEK in action..
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      01-02-2014, 08:19 PM   #15
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Deltran. Hood closed. Run cable thru front between light and grille... never an issue.
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      01-02-2014, 08:54 PM   #16
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Quote:
Originally Posted by alee0729 View Post
You should never jumpstart at the battery, but for trickle charging, it is completely fine.
Good to know - I've been trickle charging in the trunk for a few weeks and got worried at all the hood open references.
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      01-02-2014, 09:11 PM   #17
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Quote:
Originally Posted by ///M Power-Belgium View Post
Spot on ! My CTEK in action..
this one's the best for the AGM battery...
but why aren't you in AGM/winter mode (snowflake)?
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      01-03-2014, 06:15 AM   #18
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Quote:
Originally Posted by 330indy View Post
this one's the best for the AGM battery...
but why aren't you in AGM/winter mode (snowflake)?
Agreed i know about the snowflake,it's winter in Belgium but for the moment we have here 10° Celsius , and in my garage i have 18°
Hope that it stay's this way and BTW...good remark of you
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      01-06-2014, 12:34 PM   #19
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No power outlets

I store mine in a garage w/ no power outlets . Any suggestions on how to keep my battery fresh ? A trickle charger requires A/C power . I'm not sure about hooking it up to one of those portable jump starter batteries because it's not really a "trickle charger". I don't want to pull the battery out if I don't have to. I've seen a few solar trickle chargers advertised. I'm not sure how well they work and it might be hard to find a solar light source. The garage has no windows.
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      01-06-2014, 12:35 PM   #20
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I definitely would not use a jump start unit. What about a long extension cord from inside the house?
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      01-06-2014, 12:45 PM   #21
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Quote:
Originally Posted by tjsabec View Post
I put a microfiber towel between my paint and the charger cable and allow the hood to "sit down" without latching. This reminds me the charger is hooked up and also makes it easier to disconnect the charger should I get a nice warm day in the winter.

Pic for reference:

This is the same way i have my Deltran battery tender hooked up to my car, with no issue having the hood slightly open
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      01-06-2014, 05:01 PM   #22
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Quote:
Originally Posted by THE TECH View Post
I definitely would not use a jump start unit. What about a long extension cord from inside the house?
The car is not stored next to the house
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