| Batteries are a pain
Globetrotter,
Are there any loads on? Sensors? Any load will cause the charger to react.
Unless the charger is designed to handle two different battery types, you have a problem there.
are the maintenance free bateries, gell cells or AGM ?
The charger must be set to the native voltage for each type of battery.
As batteries age they will not be able to get up to full voltage and the charger may keep the voltage high, thinking they need a charge, when in reality the water is boiling off. How old are the batteries? Anything over three years is getting old. All the modern AC converters do is kill batteries.
Have fun
Carl
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