Warning: See the site of CTEK [...] Battery types All types of 12V lead-acid batteries (Wet, MF, Ca / Ca, AGM and most gel)
My small 12V gel battery now displays between 15 and 17V !! So I think this charger is not done for the GEL battery contrary to what is stated in the description.
How do I find draws a battery of 14 / 15V and not of 17V?