Unidentified issue

[tommyt1993]

Hi Everyone,
I am struggling with a problem for what i cannot find any solution.
I have an Opel Astra H 1.3 CDTI form 2008 and started to have some issues for a while.

The situation is the following:
My battery died on a morning, it was strange since the battery is only 3 months old. I took it back to warranty, they have checked everything and the battery health is ok.
My alternator charge is 14.3V and i have 10mA usage in stand by.
My battery is still in warranty, and in meantime they gave me a battery to use while the other one is in service.
The problem is that this battery also discharges, It went from 12.5V to 12.36V, so i think there might be some problems that i need to investigate.

Since the charging is in parameters at the battery terminals are fine, I thought that might be some problems with the electrical circuit of the battery, but i thought i should ask first, maybe someone has this situation also before.

Do you have any ideas what should i check?

Many thanks

 

[ruston]

Do you just do short runs using headlights, heaters ect? Your battery amp hour rating may not be sufficient to keep the battery charged enough for the cold starting current.

 

[R-fur]

is there a standing load that is draining the battery while the engine is off, either a fault on the car wiring or an accessory that has been added.

 

[tommyt1993]

Usually, i do short rides, like 20km/day (50-60 minutes).
I have no loads when the engine is off, i have checked this and no accessory has been mounted on the car since i have it. That's why i am confused. I will check the wiring from the alternator to battery to see if there is something wrong or oxide

 

[Vortigern]

If your battery is discharging it stands to reason something is discharging it. How are you measuring load when the engine is off?

 

[static zap]

Do you have a Diesel particle filter (DPF) , is cooling fan (if it even has one-!) Running on after medium-hard drive!

 

[ruston]

In your short journeys do stop start much? 50 to 60mins for 20km seem like short journeys or heave traffic. If this is the case are the headlights and other high draw accessories on ?
As @Vortigern , it is important as to how you are measuring for parasitic draw, as you could be missing it by method.

A small engined car like yours will likely have a low amp hour battery and you will not have much leeway if it it not getting a substantial charge.
[automerge]1580327741[/automerge]

In your short journeys do stop start much? 50 to 60mins for 20km seem like short journeys or heave traffic. If this is the case are the headlights and other high draw accessories on ?
As @Vortigern , it is important as to how you are measuring for parasitic draw, as you could be missing it by method.

A small engined car like yours will likely have a low amp hour battery and you will not have much leeway if it it not getting a substantial charge.

Just a footnote.. Although your alternator seems ok - is the belt adjusted properly? There should not be a lot of play on it.

 

[plugsandsparks]

Try disconnecting the battery overnight and reconnect just before you want to start it, this will at least confirm or deny a battery problem

 

[James]

Try disconnecting the battery overnight and reconnect just before you want to start it, this will at least confirm or deny a battery problem

if it starts in the morning it is likely to be due to some load being placed on it when it is connected, however a faulty battery can discharge itself when not connected to anything, due to its internal resistance.