[studio54]

Hello,

I want to maintain my battery cause my car is not a daily driver, so I will let a trickle charger hooked.

I read some conflicting informations here and here.

Is it ok to plug the battery charger with hood open and car closed ?
(the car has a push button sensor near the cabin filter, driver side)

Or does the open hood will prevent the car from going to "sleep mode" and will draw some energy ?

What is the best practice ?

(For the moment, it's hooked with hood open, and doors locked and I put some weight on the button sensor to simulate that the hood is closed)

[TheMidnightNarwhal]

When I charge my battery I just have the hood open. The car does enter a sleep mode eventually I think because if I were to open the handle you hear all the electronics waking up and all. And when that happens my battery charger level always drops down a bit until it goes into sleep mode again I noticed.

[StradaRedlands]

Originally Posted by studio54

Hello,

I want to maintain my battery cause my car is not a daily driver, so I will let a trickle charger hooked.

I read some conflicting informations here and here.

Is it ok to plug the battery charger with hood open and car closed ?
(the car has a push button sensor near the cabin filter, driver side)

Or does the open hood will prevent the car from going to "sleep mode" and will draw some energy ?

What is the best practice ?

(For the moment, it's hooked with hood open, and doors locked and I put some weight on the button sensor to simulate that the hood is closed)

Can't speak for open/closed, but the push button is part of the car alarm and shouldn't impact sleep mode.
https://www.fcpeuro.com/products/bmw...ch-61319119052

[studio54]

Originally Posted by TheMidnightNarwhal

When I charge my battery I just have the hood open. The car does enter a sleep mode eventually I think because if I were to open the handle you hear all the electronics waking up and all. And when that happens my battery charger level always drops down a bit until it goes into sleep mode again I noticed.

Thanks, so it seems that it doesn't matter then if the hood is open or not, or if the car is locked or not ? (I assume yours is not locked)
The car will enter sleep mode after x amount of time then.

Lot of people are running N54 without cowl (so the button sensor is unplugged), and I noticed something similar, that when working on removing or installing back the cowl, when I connect back or unplug the sensor, things wake up too (fuel pump activate or something), it just like if you move the mouse while the computer is sleeping However, my car was not locked when it happens, but it shouldn't change the behaviour.

[studio54]

Originally Posted by StradaRedlands

Can't speak for open/closed, but the push button is part of the car alarm and shouldn't impact sleep mode.
https://www.fcpeuro.com/products/bmw...ch-61319119052

I am not sure if it's only related to alarm.

https://www.ecstuning.com/b-genuine-...r/61319119052/

When I plug or unplug it, it seems to interact with the sleeping state of the car.
(when car is not locked at least)

[ctuna]

No hood switches on my car. 2006
Locking the car causes it to go to sleep faster also.

[The Nightman]

Ignition off is what triggers the process for sleep mode after 16 minutes. I've trickle charged my car with both hood open and hood closed (and alarm armed) with no issues.

[BRG_N54]

Originally Posted by studio54

I am not sure if it's only related to alarm

Just an FYI, if you pull up gently on the hood switch, it will put it into a "test" mode that is meant to mimic the hood being closed.

[studio54]

Originally Posted by The Nightman

Ignition off is what triggers the process for sleep mode after 16 minutes. I've trickle charged my car with both hood open and hood closed (and alarm armed) with no issues.

Interesting thanks, so it just has to be ignition off to go to sleep mode : hood open or closed, car locked or unlocked, it will go to sleep, nice, no headlock !

What made me doubt was reading a post of someone that noticed its battery was draining faster with open hood (he was opening the hood to prevent his cats to lay on the hood).

While IBS seems to be a clever system, it also seems to drain the battery to a certain point, one SoC measure every 14 seconds, isn't it a bit excessive to monitor the battery every 14 seconds?!?... When it's critical it will probably go into "emergency" mode that I got sometimes (date and time reset) and lot of stuff are shutted down? Maybe the alarm too?

I understand now why if I don't daily drive the car, my batteries won't last more than 3-4 years. The IBS + the alarm are probably factors.

Now the battery is new, on battery tender, I hope it will be better. (I need to buy an anti surge power strip for peace of mind)

Originally Posted by BRG_N54

Just an FYI, if you pull up gently on the hood switch, it will put it into a "test" mode that is meant to mimic the hood being closed.

Oh cool, heh better than to put some weight on it like I did
(But now I won't bother anymore since it's the same with hood open or closed)