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  #1  
Old 11-01-2018, 08:38 AM
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Battery tender for agm battery via jump posts advised?

Hi all ok can see there are other posts here on batteries etc but anyone know if connecting a modern charger to the jump posts in the engine bay to "top up battery" a potential cause of problems with the car sensitive electronics? I read somewhere over 14.4v running through the X5 is not good (please correct me if not the case)



for example the agm mode on my ctek says 14.7V/5.0A, I do have another lower end charger that states agm setting as 14.7v/3.8A which i guess is safer but I am pretty sure I read the 14.4v max somewhere......


Having to take out battery from rear to charge it direct is safer and eliminates the risk but more than a pain in the rear (and back) so the jump posts up front seems to be the only feasible way (apart from the dc llighter socket that I dont want)


Much appreciate a reply from any of the electrical gurus online and there are quite a few , BUT i am not one of em
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Old 11-01-2018, 08:55 AM
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No issues. Been doing it forever...3 ah, 7amp and 25 amp AGM charge profile chargers
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Old 11-01-2018, 08:56 AM
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Engine bay is perfectly fine...and that is what it is designed for.


The new generation BMWs that have an IBS (intelligent battery sensor) requires that the battery be charged from the engine bay posts...because if it isn't, it can create issues with the IBS interpreting a big change in the battery's voltage as a fault.


You didn't give the model number of the CTEK charger you have...but if it is like most of the ones discussed on the forums...it has a "maintainer" feature that should stop charging the battery when it reaches a certain voltage.


{I'm not an electrical guru...I know just enough to hopefully not electrocute myself...so if I misused "voltage" and should have written "current" or some other electrical term...can I have a "pass"?}
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Old 11-01-2018, 09:49 AM
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I would make a handy cable to chase via the trailer port if you have a tow package. One of the more clever tips I've read.
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Old 11-01-2018, 09:52 AM
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Just as easy in ~the boot~.
Ctek makes a extension cable in 2 lengths.
Extension cable just hands out on the rear DS panel
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Old 11-01-2018, 10:33 AM
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Good idea. If you don't have trailer package : you don't need to make a cable to the battery: on X5 the trunk 12v outlets are always live just use that. Put a male 12v plug on your tender and done.
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Old 11-01-2018, 10:57 AM
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I used to use the Schumacher 1.5amp maintainer in my E53 engine bay and recently upgraded to this 4 amp unit from Harbor Freight for use on my H8 size AGM battery



https://www.harborfreight.com/4-amp-...ner-63350.html

Been using it for months and have all my BMW vehicles on them now and have experienced no issues. This unit has a specific setting for AGM batteries (as well as lead acid) and a winter setting which is user selectable.

In the E53 engine bay, the unit fits nicely on the driver side (US) just ahead of the shock tower. This allows easy connection to the jumper terminals and electrical power out the front of the hood.

Mike
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Old 11-01-2018, 10:59 AM
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Quote:
Originally Posted by Qsilver7 View Post
Engine bay is perfectly fine...and that is what it is designed for.


The new generation BMWs that have an IBS (intelligent battery sensor) requires that the battery be charged from the engine bay posts...because if it isn't, it can create issues with the IBS interpreting a big change in the battery's voltage as a fault.


You didn't give the model number of the CTEK charger you have...but if it is like most of the ones discussed on the forums...it has a "maintainer" feature that should stop charging the battery when it reaches a certain voltage.


{I'm not an electrical guru...I know just enough to hopefully not electrocute myself...so if I misused "voltage" and should have written "current" or some other electrical term...can I have a "pass"?}

thanks its a MXS-5.0 there was another long post regarding this and just confused me a tad more as to that setting is safe on the MXS-5.0 or what combination, and especially on suitability of agm batteries IF you are a a low mileage driver e.g school run etc alone(not doing more than say 10 miles a day with heaps of stop starts) ....flip side to this I have read a bmw tis advise to use agm in cases where cars are used indeed for such trips....see end of article below


BMW Workshop Manuals > X Series E70 X5 3.0Si (N52K) OFFRD > 2 Repair Instructions > 61 General Electrical System > 20 Battery > 9 RA AGM Battery > Page 2324

When vehicle batteries are charged, the two gases oxygen and hydrogen are released by electrolysis.

In a conventional wet lead calcium battery, the two gases hydrogen and oxygen are dissipated into the
atmosphere.

In an AGM battery, the two gases are converted back into water: The oxygen which is created at the positive

electrode during charging passes through the permeable glass fibre fleece to the negative electrode. At the
negative electrode the oxygen reacts with the arriving hydrogen ions in the electrolyte to form water (oxygen cycle).

In this way, the gas and thus also the electrolyte are not lost.

Only in the event of an excessively heavy buildup of gas, i.e. excessively high pressure buildup (20 to 200 mbar),
does the pressure relief valve discharge the gas. In this process, the pressure relief valve does not allow any oxygen in
the air to enter. Because a valve regulates the pressure in the battery, the AGM battery is also known as a VRLA
battery (Valve Regulated Lead Acid).

Notes and instructions for service personnel

It is necessary when handling an AGM battery to observe some particular points pertaining to battery changing and

installation location.

Charging

Warning! Do not charge the AGM battery with

15.2 V. No quick-charging routines!

When charging removed batteries (so-called stand-alone batteries), do not exceed the maximum charging
voltage of 15.2 V at room temperature. Also when charging via the jump start terminal, do not exceed the

maximum charging voltage of 15.2 V at room temperature.
The AGM battery will be damaged even when it is only briefly charged with a charging voltage of more than
15.2 V. A charging voltage of more than 15.2 V is usually used in quick-charging routines.

Installation location

Warning! Do not install the AGM battery in the engine compartment.

The AGM battery must not be installed in the engine compartment on account of the high spatial temperature
differences, otherwise its service life will be significantly shortened.

Housing

Warning! Do not open the AGM battery.

The AGM battery must not be opened under any circumstances as the introduction of oxygen from the air will
cause the battery to lose its chemical equilibrium and be rendered non-operational.

Battery changing

Any conventional lead calcium battery can always be replaced by an AGM battery.

Using an AGM battery does not require any alterations to be made to the vehicle electrical system.

Note: The AGM battery is recommended for "problem customers".

"Problem customers" encounter a high energy throughput through their batteries. This high energy throughput
is caused by stationary loads/consumers (TV, independent heating, etc.) and a bad use profile for the battery
("chauffeur operation", short-distance driving, "stop-and-go"). The use of an AGM battery is recommended for
these problem customers.
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  #9  
Old 11-01-2018, 11:53 AM
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14.4. vs. 14.7.....it's not the end of the world here. All batteries like to be at a full SOC. Whether it's agm or wet cell, they still are best at full SOC. Regardless of what profile you choose on your ctek, the alternator is not going to be charging our agm at 14.7

Just swap the battery or confirm it's not your alt as part of troubleshooting
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Old 11-01-2018, 01:07 PM
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Yup will get it done soon see how i fare with a new battery any sign of issues with slow starts i will start to look at starter swap....as both alt output is fine so is amp draw when X is off and sleeping.
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