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thanks, I have tested other car batteries with same load (3A) wich gives around 65Ah, they are rated typical 75Ah. shouldnt the result be more comperable as long as they are all lead acid ?

I have a 12v 700CCA 90Ah car battery with a odd behaviour. The loadtester says its performance are good and the readings are around 800 amps starting capacity. The digital batterytester says it good with a SOC of 70%, 500A and an internal restistance of about 5 mohms. All this looks good, but...