I think one very important fact or rather one very important question is being glossed over here...
WHY do you feel you need a charger? Is it to do regular maintenance charging in between flights?
If you answered yes to the question above then it's time you did some study on the Recombinant Gas (RG) battery technology which is the core of your RG25XC battery. (The RG in RG25 is an abbreviation of Recombinant Gas, the XC is for eXtra Cranking capacity.) These batteries have very low self-discharge rates. You can leave them for quite a long time without charging them and, unlike a flooded lead acid battery, they won't have self-discharged to the point of being flat.
Flooded lead acid batteries such as what we find in most of our cars have a fairly high self-discharge rate. It's this older technology that many of us grew up with, thus we are very familiar with the need to put a battery maintainer or trickle charger on the battery to keep it well charged during periods of disuse.
Flooded lead acid and Recombinant Gas are two totally different battery technologies. The RG battery does not need a battery maintainer or trickle charger. If you fly once a month that will be plenty to keep the battery in good shape. Perhaps not so much your engine, but at least your RG battery will be happy.
Don't apply the old "must keep it trickle charged" mindset from the days of flooded lead acid batteries to your new RG battery - treat the new battery as it is intended to be treated. No trickle charging is required.