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Battery Life with Smart Alternator Charging

  • 10-11-2021 8:50am
    #1
    Registered Users Posts: 3,018 ✭✭✭ John.G


    What kind of battery life are you getting with the above?, these charge at various levels, very little when driving normally (12.6V/13.4V) and very high charge levels (15V) on overrun. The VAG group seem to base battery life (for EFB batteries at any rate) on a cycle life of 50 X battery capacity, in my case 50X59, 2950 AH, the usable battery charge is calculated on the (battery charge level) X (the remaining cycle time), 59*0.78*(2950-1280)/2950, 26AH. This means that I should/could expect ~ 6.5 years battery life but a lot of people do my kind of mileage in 1 year so don't know if below means anything. Someone with VCDS might care to check out their readings and comment. The car has Stop/start but this is disabled for 90% of the time so can virtually be ignored.

    4/11/2021 (Jan 2019 Polo)

    18:56:19 13,512Kms

     IDE01834  Battery voltage 12.116 V

     IDE01836  Battery current -4.761 A

     IDE01837  Temperature of battery sensor 8 °C

     IDE01838  Battery temperature 7 °C

     IDE01839  Battery charge level 78 %

     IDE01841  Battery internal resistance 6.8 mOhm

     IDE01842  Usable battery charge 27 Ah

     IDE01843  Battery voltage at rest 12.5 V

     IDE01848  Energy balance of last driving cycle 0.0 Ah

     IDE01849  Previous journey duration 0.0 H

     IDE07681-MAS06086  Battery total charging throughput-Total re-charge 1280.2 Ah

     IDE07681-MAS06087  Battery total charging throughput-Entire energy throughput 1390.7 Ah



Comments

  • Registered Users Posts: 18,052 ✭✭✭✭ Del2005


    How long your battery last depends more on driving style more than anything else. If you do lots of short journey's your battery won't last feck all time, if you do mostly long journeys your battery could last decades. We've batteries that are >20 years old still starting vehicles.



  • Registered Users Posts: 3,018 ✭✭✭ John.G


    That was with conventional charging systems which, at least on VWs, charged at a constant 14.1V/14.3V, I've never had to replace a failed battery in 58 years of driving, I did replace one, purely as a precautionary measure after ~ 12 years on a 2005 Polo still in the family, this car has spent its whole life on very short (shopping) runs. Will keep an eye on this one and report progress.



  • Registered Users Posts: 3,018 ✭✭✭ John.G



    24/01/2022 (Jan 2019 Polo) 14,154 kms

    IDE01834  Battery voltage 12.166 V

     IDE01836  Battery current -4.386 A

     IDE01837  Temperature of battery sensor 12 °C

     IDE01839  Battery charge level 79 %

     IDE01841  Battery internal resistance 7.8 mOhm

     IDE01842  Usable battery charge 28 Ah

     IDE01843  Battery voltage at rest 12.5 V

     IDE01848  Energy balance of last driving cycle 0.0 Ah

     IDE01849  Previous journey duration 0.0 H

     IDE07681-MAS06086  Battery total charging throughput-Total re-charge 1354.8 Ah

     IDE07681-MAS06087  Battery total charging throughput-Entire energy throughput 1478.3 Ah



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