Centra Futura Plus 75Ah Battery Voltage Drop: Comparing 760A Inrush Current vs 1.9 TDI Engine Start

The patient is Centra Futura Plus 75Ah, inrush current 760A. As problems with starting appeared in the car from the moment the temperature dropped below zero, the battery was barely able to turn the engine (1.9 TDI) after a night at a temperature of -5 to -10 and I had the car checked. The service said it was a battery. I gave it back for complaints (it's only a year old). I got a replacement battery, which of course had no problems with starting. Interestingly, today I picked up my future - the complaint was dismissed, the battery was supposed to be operational. Nobody can explain to me why a replacement battery with a smaller capacity and 100A lower starting current was able to start the car without any problems, and my allegedly matter-of-fact battery was not. The car, of course, checked, power consumption at the level of 0.06A. And here the question is whether such battery test results are actually good. Remember that the battery is 75Ah, 760A.

1. Rest voltage - 12.9V
2. The voltage for the current Is = 510A Uf = 8.6V
3. Short-circuit current Iz = 1686A
4. Voltage under load 200A - 10.87V

I wonder if 8.6V for 510A is not too big a drop? They didn't test it at a higher current, and I think a cold engine starter could take more current.

I am waiting for the night, I will see how the starter behaves in the morning, but somehow I do not expect any miracles, since they did not do anything with the battery.

It seems to me that these 8.6 are almost likely to drop below 9V. I have a question where the measurement was made and whether the meter is sure, I have a 1.7 DTL Jenox battery in the Astra with a capacity of 85 Ah and the voltage on it while turning the starter plus candles incandescent never dropped below 10.5V. Check the electrolyte density before and after start-up.

The tests were done by the Centry service in Poznań, as I can see on the stamp. Type B-200 starter battery tester, that's what I write on the printout. It also seems to me that 8.6V is a bit too little, that it shouldn't drop so much. especially since they probably did not do it on a battery frozen to, say, -10 degrees C. I am looking to see if there are any standards for this, something like that at, say, 80% of the maximum current, the voltage should drop no more than XX Volt or the good / defective rating is just a subjective assessment of the website.

Gh0st81 wrote:

Tests were done by Centra service in Poznan as I see on the stamp. Starting Battery Tester type B-200, that's what it says to me on the printout. It also seems to me that 8.6V is a bit too low, that it should not drop so much. Especially since they probably didn't do it on a battery frozen to say -10st.C. I'm just looking to see if there are any standards for this, something like at say 80% of max current, the voltage is supposed to drop no more than X.X volts or is the good/damaged rating just a subjective service rating.

The series resistance of your Aku is about 8.4 mΩ seems to be ok
With a resting voltage of 12.5V and a resistance of 9 mΩ, the starter should give rated power.

Does anyone have the text of the IEC or EN standard specifying the starting current of the battery? I found a description saying that according to IEC inrush current is to be consumed for 60 seconds, the battery is to be -18 degrees C and the voltage must not drop below 8.4V
Can anyone confirm / deny this?

They always dismiss complaints, their normal practices will do and describe everything so that the fault is on your side ... no one takes into account the fact that in such a frost that was recently in our case, even a small discharge freezes ..... and thus its efficiency significantly ... significantly decreases ...

The fact that they are spinning as much as they can is clear, but the frost is different, something else is the battery that cannot turn the engine at -7 degrees ... they check, even though I have a strange feeling that it will turn out to be okay.

hello I have the same battery and I bought it in September 2009.
yesterday he fired terribly. I will see how tomorrow and the frost is -15 -: - -10
if I have problems, it also advertises; /

I am waiting for Centra's decision, as it went to Poznań to be checked. I hear more and more bad opinions about Futures, people talk better about Centra Plus

and the centers declared damage as a result of bad exploitation ... destruction of active masses of positive plates ... failure just ... interestingly, when they checked it for the first time, it was allegedly functional, then they gave it back to me, I had it in the car one day and gave it back a second time. And this time it turned out to be damaged. I think I will have to get the consumer ombudsman interested in this case because it gets ridiculous.

I have a similar problem with the battery, namely in the morning during frost -8 degrees, the voltage of the rest battery 12.2V after turning the key drops to 11.8V, while already when starting the car it drops to 8.6V, the starter made in September 2017, completely new bushings, brushes, cleaning, lubrication. Battery bought new in November 2016. Checked on the tester in the store, he still had 75% of active power (a guy in the store said that this battery is currently suitable for a gas engine, with its efficiency). Checked by an electrician on a resistor, the voltage drops slightly. However, where I bought the battery, I asked the guest to check with the resistor, it was obvious that he checked the battery very "delicately" and said that he was holding the battery, because he wanted to avoid sending a complaint. However, I found that I would be a complaint because the warranty ends in November 2018 and from December it is frost and you know ... a new battery purchase ...

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Recognizing a complaint on aku is like hitting 4 in the lottery.

I think that the battery was just discharged and they charged it in the service and then tested it. These parameters that you wrote in my opinion are ok. In my opinion, if the starter with the battery intended for it turns without any problems for 10 seconds at -20 ° C, the battery is in very good condition. If it does not spin 5s at -10 ° C, if it is the same after charging it, it means that it is used up by about 50%.