new battery c5

[xf1ref]

Hi all,
does anybody know if I can declare new values for battery with diagbox? I have only 3 values: 60,70 and 75Ah and I'm restricted to choose a new battery.
I know that I have to declare the Ah value accordingly to the value of the new battery but I didn't find where.


The car is c5 exclusive 2012 2.0hdi 163hp

[GiveMeABreak]

That picture is so small we can't see any detail and it won't zoom.

The recommended for your car (163) is 720A (Cold Cranking Amps) and 70AH (Amps / Hour), so select 70. The 75AH is for the 3.0 LV6.

[white exec]

I'm intrigued to know what difference 5Ah battery capacity makes to anything....?

[GiveMeABreak]

The recommended 75AH on the 3.0L also states 800A - so perhaps just a bit more welly for the bigger engine to use a technical term.

[xf1ref]

Sorry for the small picture.


The idea is that I will buy a aftermarket battery and it will have a different value, like 77Ah or 80Ah and usually a 70Ah battery have the Cold Cranking Amps smaller than 700A.

[GiveMeABreak]

You really shouldn't go below the recommended 720 / 70 - especially with the X7 as there are a lot of electronics constantly powered, and as we know, C5s like their batteries in tip top condition.

[xf1ref]

Thank you Marc, the original battery si 720 / 70 and sometimes I have some strange error codes like:
- U1218 (One of the parameters present in a datastream sent by the BSI is invalid)
- P0215 (Poor operation of the relay, the ECU is not being supplied as it should be)
and I think the battery is at the end of life.

I don't want to go below 720A / 70 but almost all aftermarket batteries have bigger values for Ah.
For example I found exide premium 77Ah / 760A but the problem is that I can't declare 77Ah in the ecu

[GiveMeABreak]

That's fine - declare the nearest value to the battery you get

[Paul-R]

As a matter of interest - how old is the car (and presumably the battery)?

[white exec]

Just fit the largest and best battery you can find. The higher the CCA and Ah figures the better.

[xf1ref]

Paul, is the original battery Exide 70Ah / 720A from 2012, the year of the car.

I found Exide premium and Tudor (belong to exide group) 77Ah / 760A both and I will set 75Ah in ecu.

[xf1ref]

One last question, I saw that some sites recommend Agm battery for C5. Can I install this type of battery?

[GiveMeABreak]

I have in mine - and the last C5 - can't fault it

[xf1ref]

I changed the battery with new one exide 77Ah 760A and I tried to declare 75Ah with diagbox but every time I get configuration error.
It only worked when I changed the "Battery technology type" from Freezing to Other. In that moment when I did the configuration the car was in Economy mode and suddenly come out from economy mode.
Battery technology type should be Freezing or Other? With "freezing" I can setup only 70Ah battery.

[GiveMeABreak]

Can you advise where in Diagbox you are trying to change these values? What menu are you in?