I've been trying to educate myself on the batteries and the charging system in my OC45. I initially thought there may have been an issue with the house batteries and was giving the dealer grief, but I now think they are fine. However I did find one problem with the Chargers. My boat shipped with Cristec CPS3 OEM's,a 60A, and a 25A. I have the manual which is a good thing since they are OEM Chargers and the manuals offered on the Cristec website are for the retail versions, they are different. The retail versions seem to use a selector wheel, the OEM use DIP switches.
The charger's default factory settings are for Standard Lead Acid. My boat has AGM. Somehow the settings were not adjusted to reflect this. The difference as best I can tell is just in the Float voltage, 13.8 volts versus 13.6 volts for AGM. My Deka's clearly state 13.4~13.6 volts for float.
You might want to check your boat to see how it is set. One tip off might be to use a voltage meter and take a reading 'AT THE BATTERY' during Float/Maintenance charge. Don't rely on the panel read out, it isn't accurate. The chargers have a yellow plastic access cover that is held on by a single screw. You may need to use a mirror or a smartphone to see the settings on the starboard side.
How my boat was delivered.
Cristec CPS3OEM Manual.