I used to do that all the time, as Hawker and other stated, it works fine.
In my case - the standalone chargers were not as "automatic" as the Marine chargers are - so depending on your charger, you may want to assure you remove the charger promptly to avoid over-charging, and negatively effecting the life of your batteries.
The biggest benefit for me was the automatic nature of Marine multi-bank chargers. They do a great job protecting from over-charging.
It worked for me when funds were tight.
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