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Good plan. I replaced the original battery in my 2017 C2S last summer. iCarsoft POR 3.0 testing of the battery indicated that it had about 65% of the original capacity, and I was starting to observe some anomalies in functioning of various electronics systems on my car, and most importantly to me, I had just experienced total sudden failure the OEM battery in my 2011 Audi. Fortunately, I the car was in the home garage when it failed and barely started the car. It's not worth being stranded -- at best it will cost you considerable time. And as I learned from that Audi experience, if the battery monitoring system goes into its "bad battery" mode, it was much more involved for me to get the system rebooted. I ended up buying another Scan tool for the Audi because my Foxwell tool wouldn't work properly even though it was supposedly designed to cover that vehicle and other Audis and VW vehicles. I didn't want to go through that hassle with my Porsche so I swapped in a new made-in-Germany AGM battery of identical capacity that I bought from Walmart which included a 4 year replacement guarantee.
I do use battery maintenance chargers on my vehicles when parked in my home garage. I usually get over 10 years out of an original vehicle battery. But I have twice experienced a battery seeming to be perfectly good that is >10 years old and then suddenly totally failing. These sudden failure batteries were in BMWs and Audis and of the flooded lead-acid type, not AGM.
Thanks to this thread: https://rennlist.com/forums/991/1256...w-battery.html I successfully updated the BMS.
The battery voltage went from 14.8V while running to 12.8V while running - which confirms battery registration is essential to recalibrate how much the battery needs to be charged.
There was another thread here claiming no ill effects or nor change without battery registration, but in my case, my old dying battery required a lot of volts to keep charged and the new one considerably less.
03-11-2024, 11:52 PM
Dying battery
