Advice re auxiliary battery

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IMO Cetek is the best system, On my R230 SL I’ve got “Cetek traffic light connectors” on both batteries giving an instant view on charge condition. As my auxiliary battery is getting old (2008) it gets coupled up as soon as the car is in the garage but so far I haven’t required to charge the main battery which is a 2018 one.
My CLS is still under warranty and so far I haven’t experienced any problems with the batteries.
 
Thanks for quoting my thread from the Slk Forum. The SLC shares the same model number (R172) as the SLK and I would have assumed that the Aux Battery for both models would be in the same location. Unless of course MB replaced the Aux Battery on the SLC with a Capacitor type device like on the W205? As I understand it, the capacitor is only used to smooth and stabilise the voltage during the ECO starting from the main battery.
 

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