Hi everyone, I'm designing a battery charging system. Now my batteries are connect to AN0 which is RA0 to read the voltage in order to display in the LCD. But now the problem is that I have to charge the batteries. I'm afraid that once I supply voltage to the batteries. the voltage will flow to the MCU pins which is RA0, RA1,RA3,RA4,RA5. Can anyone tell me what should i do ???