Car battery for Citroen C5

[GalianoGalianei]

Hi everyone,
recently I have replaced my car battery. I have a Citroen C5 Tourer 2.0 2011. My oly car battery was yuasa ybx5096. Now I have KBK battery. Old one was 80Ah with 740A for start. My new one is 75Ah with 640A for start. I have 2 year warranty. Is this battery good for my car?
Thanks in advance.

[GiveMeABreak]

The previous battery was not factory specification, so has likely been replaced already. Let me have the VIN, and I can advise on what the minimum recommended battery is for this vehicle, as they change with fitted equipment like Stop Start, engine and depends on the climate of the country.

[GalianoGalianei]

The previous battery was not factory specification, so has likely been replaced already. Let me have the VIN, and I can advise on what the minimum recommended battery is for this vehicle, as they change with fitted equipment like Stop Start, engine and depends on the climate of the country.

Sorry for late reply, sure here is my VIN VF7**************[VIN obfuscated, can be read by forum staff], let me know is my battery good enough

[GiveMeABreak]

Ok, so your vehicle originally was fitted at factory with a Level 3 720 70A battery, so you have a less powerful battery if this is 640 CCA.

Just to be clear CCA (Cold Cranking Amps) is NOT the same as the European EN (European Norm) rating. As the EN tests are more rigorous, as the battery is tested at its peak performance for a longer period of time, you can't replace for example a 680 EN battery with a 680 CCA battery as it would be under powered for the vehicle.

So in your case you need at least a 720 CCA battery as a minimum.

[GalianoGalianei]

I already replaced my car battery with 75Ah and 640 CCA, what will happen to my car?

[GiveMeABreak]

Nothing will happen, but the battery you have fitted means it does not have the power that may be required to start the vehicle in say winter, where the battery's ability to start a cold engine is more demanding.

Basically, the colder the temperature, the more power is required to start the engine, because the battery power supplied in cold conditions is less than normal - meaning it takes more battery power to start the vehicle.

CCA tells you how many amps a 12-volt battery can support for 30 seconds at -17.8 ° C before the voltage drops to at least 7.2 volts per cell.

So at 0°C, your supplied battery power will be 65%, a drop of 35% compared to a temperature of 27 °C.
At -18°C, supplied battery power will be 40%, a drop of 60% and so it goes on.

So your vehicle has a specific engine and the recommended battery is the minimum required for this engine to start it in cold conditions.