noco

I'm looking for a new charger and considering the NOCO brand ones with a desulfate mode. Which one do you use or recommend?

Last week i bought two NOCO Genius1 chargers/maintainers. I put them on two different batteries, one is 800CCA marine and another is a small 230CCA ZT. Both batteries were fully charged before i connected NOCOs. Both chargers were blinking red light for a few seconds then went solid green. It is...