I have changed the Power Supply Board in the charging station, the old one didn't charge the battery, but now I have problems whit the new one. If I messure the voltage from the power supply whitout and load the is 21,9 V, if I connect the Power Supply Board it drops to 3,4 V, is that correct ? There is a led indicator to show if it's all ok, and it don't show anything, who can help ?