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How does a charger balance batteries connected in series?

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CatalinaWOW:
I don't know what this charger does, but the chargers I have all generally use the following strategy, which involves a sequence of steps.  The charging/balancing is not continuous.

First the battery string is charged to near full charge.  Then charging current is turned off and cell voltages are evaluated.  High cells have a light load applied and charge current is restored.  Repeat until time limit is reached. 

This process will generally balance a battery, but if it is too unbalanced to start the time limit will be reached before balance is complete.  I then either separately charge the low cells, or use an external balancers.

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