Smart chargers are needed because with manual loading (this also with stupid chargers when you permanently with a multimeter measures the voltage state and then in due course coitus-interruptus makes) the battery either cooked (too high voltage) or not nearly full loads (low voltage).
Therefore invite intelligent chargers allegedly by a characteristic (eg the IUoU-charging characteristic).
Supposedly ... the EUFAB 16584 certainly not ... but I have the following two tested and for 'good' and 'reliable' found (have each every few minutes as measured with a multimeter the voltage profile):
o Alpin 62132 Battery charger Microprocessor controlled, 6 / 12V (with 4AH too strong for motorcycle batteries)
o Einhell BT-BC 2 D battery charger (2 Amp, therefore just as suitable for motorcycle batteries, but in any case for motorcycle AGM batteries)
Maybe my experience will help yes the one or the other when deciding what to buy