Charging batteries over winter

Earlier this year, I installed an on-board charger on my boat to charge the
starting and trolling battery.

Question: Is is ok to leave it plugged in all winter, even if I'm not
planning on using the boat until about the first of March? Or, should I only
charge it every once in awhile?

The charger I have is one of them that suppose to continually condition the
batteries, but I cannot find the owners manual to see what it says about
storage.

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