In principle, this is not a special EFP or EFB charger. With this type of battery, the final charging voltage should not be higher than 14.6 volts. In order to be able to use this charger sensibly, it should be charged like a normal lead-gel or wet battery (simply not in AGM mode). In this way, a final charge or float voltage of 14.4 volts is achieved. This works perfectly in practice. I do it myself every winter with a seasonally used vehicle :-)