Battery Keeps Going Flat - Vauxhall Antara Forums
 
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post #1 of 6 (permalink) Old 29th November 2020, 18:25 Thread Starter
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Location: Warwickshire
Posts: 256
Battery Keeps Going Flat

Hi Guys

I have another problem now, my battery keeps going flat. I replaced my old 18 month battery because it was going flat, for a brand new start stop unit and fully charged it. All was well, however just tried to start the car after two days and the new battery was flat. I think I have a discharge somewhere. So I have managed to get enough power into the battery to start the car and then took a voltage on the battery of about 14.9v with the engine running, which I think is ok. I then configured the centre screen to display the cars voltage and was obtaining high 14's when stationary and approx 14.4 when travelling. After a 20 minute run the car was able to start with no problems. I am fairly certain my charge system is OK.

So moving on to try to diagnose a drain fault. I have a multimeter with a 10A amp meter capability. I plan to, after fully recharging the new battery, connect the meter between the positive battery terminal and lead to see how much drain I have from the battery.

Bearing in mind I have just had a duplicate key made for my car which we operate purely in the lock, could this of caused this problem, really struggling with this.

I have read that the cd30 unit could be the problem. Anyone any ideas.

Richy
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post #2 of 6 (permalink) Old 1st December 2020, 23:46
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Richy,

Victor posted this a few years ago.

https://www.antaraownersclub.com/for...ock-fault.html

2015 2.2 CDTi SENav 163ps manual 4x4 in Carbon Flash with 19\" alloy spare towing a Bailey Unicorn III Madrid @ 1500kg.
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post #3 of 6 (permalink) Old 2nd December 2020, 06:05 Thread Starter
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I'll try that Thanks Dulac. It appears the new battery won't accept a charge so I'm in the process of replacing it, I'll let you know. Once I sort the battery I need to check for a parasitic discharge. Because I only have one original key, my second is a copy without buttons which my wife uses, appears to work perfectly just using the door lock. I'm hoping this isn't a problem.

Just though I was getting sorted with this car, I shall persevere. Richy

Last edited by Richy; 2nd December 2020 at 06:12.
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post #4 of 6 (permalink) Old 2nd December 2020, 13:47
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Going back to basics, have you read the OM? I found that it offers a bit more than which knob to twiddle! Simple stuff but this is from the 2013 model OM that might offer a clue:

Charging system
(battery symbol) illuminates red.
Illuminates when the ignition is
switched on and extinguishes shortly
after the engine starts. If it does not
illuminate, seek the assistance of a
workshop.
Illuminates when the engine is
running

Stop vehicle and switch off engine.
Battery is not charging. Engine
cooling may be interrupted. The
brake servo unit may cease to be
effective.

and:

Battery discharge
protection

To prevent the battery from becoming
discharged, the exterior lights turn off
automatically 10 minutes after the
ignition is switched off.
Battery discharge protection will not
work if the lights are turned on
10 minutes after the ignition has been
switched off; the key cannot be
removed from the ignition switch until
the battery is recharged.

and:

Battery
Vehicles without stop-start system
will be equipped with a lead acid
battery. Vehicles with stop-start
system will be equipped with an AGM
battery which is not a lead acid
battery....
...Retrofitted electrical or electronic
accessories can place an additional
load on the battery or discharge the
battery. Seek the assistance of a
workshop regarding technical
possibilities, such as fitting a more
powerful battery.
Ensure the ignition is switched off
before reconnecting the battery. Then
perform the following actions:
1. Set date and time in the
information display 3 76.
2. If necessary, activate the power
windows and sun roof 3 29, 3 31.
In order to prevent the battery from
discharging, some consumers such
as the courtesy lights automatically
switch off after a delay.
Charge a disconnected battery every
6 weeks.
Battery discharge protection 3 113.
Replacing the battery
Note
Any deviation from the instructions
given in this paragraph may lead to
a temporary deactivation of the stopstart
system.
Only use batteries that allow the fuse
box to be mounted above the battery.
In vehicles with stop-start system,
ensure to have the AGM (Absorptive
Glass Mat) battery replaced with an
AGM battery again.
An AGM battery can be identified by
the label on the battery. We
recommend the use of an original
Vauxhall battery.
Note
Using an AGM battery different from
the original Vauxhall battery might
result in a lower performance of the
stop-start system.
Charging the battery
9 Warning
On vehicles with stop-start
system, ensure that the charging
potential does not exceed 14.6
volts when using a battery
charger. Otherwise the battery
might be damaged.

2015 2.2 CDTi SENav 163ps manual 4x4 in Carbon Flash with 19\" alloy spare towing a Bailey Unicorn III Madrid @ 1500kg.
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post #5 of 6 (permalink) Old 2nd December 2020, 15:11 Thread Starter
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Thanks Dulac

Must confess the comment about charging is interesting being 14.6 volts, my car can exceed that on idle.

I did lookup the 019 AGM battery which should be suitable for my car.

The bit about battery discharge protection is also really useful, so it should be ok to leave the light switch on when the car is parked up as long as they are not switched on 10 minutes after parking up. Seems sensible.

My car is absolutely standard except for obviously the towbar wiring and a copied key. The towbar auxiliary electrics are wired through a split charging relay. I'll let you know how I get on. Richy
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post #6 of 6 (permalink) Old 8th December 2020, 15:29 Thread Starter
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This is starting to look a little more promising.

I purchased a Silverline battery tester, so I then removed the battery from the car, ensured it was fully charged and then placed it on the tester for 10 seconds. The tester applies a 100A load to the battery and monitors its voltage performance. Well the new battery failed dismally with the voltage dropping rapidly to 8 volts when it should of maintained around 12 volts.

So then with a new battery in place I have now carried out a parasitic draw test after allowing the car to settle down with all the doors locked and waiting about 10 minutes, as Dulac identified in his note. This test measures the continual battery discharge whilst the car is not in use. I used a Flute multi tester which has a 10A meter capability and has min, ave and max readouts. I expected the discharge to be quite smooth but in actual fact it was quite unstable and difficult to fully interpret whilst it kept jumping around. However after pressing the Min, Ave & Max buttons these levels could be read. The min was 20mA, ave was 40mA and max was 70mA, the test accuracy is only down to 2 decimal places so the 40mA is probably around 45. I understand that a reading of around 50mA is normal. So It would appear my cars parasitic load is normal and now seems to be working fine with the new battery. Now just got to attempt to return the faulty battery.
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