In constant voltage charging method, the charging current from discharged to fully charged condition

The correct answer is A. decreases.

In constant voltage charging, the charging current decreases as the battery becomes more charged. This is because the battery’s internal resistance increases as it becomes more charged, which causes the charging current to decrease.

Option B is incorrect because the charging current decreases, not increases.

Option C is incorrect because the charging current does not remain constant, it decreases.

Option D is incorrect because the charging current does not increase, it decreases.