Hello, I have had a CTEK Multi XS 4003 since c. 2010 (equal to MXS 5). In my opinion a very good charger. Last week I screwed about 8 hours on the car and let the radio run, after the subsequent start the engine took care of something and the onboard computer warned me of the low battery voltage, i.e. charger connected, battery fully charged, everything again well! Now I have read the operating instructions from the charger again and there stood over the “Recond mode” that you should use with deep-discharged batteries or once a year to restore the power of the battery?! On the other hand, the manufacturer warns in the guide against too strong water loss! I have never used the Recond mode! My car battery is a maintenance-free Centro battery with 74Ah from February 2008! Should you use the Recond mode to refresh the battery? The battery is almost 5 years old after all.