Tony Dyson
Senior Member
- Joined
- Aug 26, 2018
- Messages
- 4,038
- Reaction score
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- Location
- God's Country
- Your Mercedes
- 2014 C 220 CDI W204 OM 651
With the CTEK, Desulphation does not happen on AGM batteries as they do not suffer from this problem & is why they are ideal for deep discharge and standing unused for long periods without maintenence.
The "Desulphation" phase is an "if required" phase where the charger can detect the condition. If (as in AGM batteries) there is none, it skips to the next phase or keeps pulsing until charging can start.
About 10 years ago when I purchased my CTEK, I had several emails to and fro with CTEK. I had several (then very expensive) AGM batteries in my off road caravan (for off grid power) and my LandCruiser with an AGM auxiliary battery (also for off grid power).
The image I posted above which is from the CTEK MX5 OM clearly shows a desulphation stage taking place on every battery setting at 15.8v that can last for up to 8Hrs, you're mistaken this is not an option to deselect.