Someone had told me that this can harm the battery in my computer. I looked at the plug type and the voltage is fine but the Frequency is 400 Hz and my computer charger displays a range of 50-60 Hz.
Will this harm any component of the computer or charger?
As your charger is 50-60Hz it is very likely that you will permanently damage your power supply, battery or even you computer.
It might work for some time but I guarantee you that some component will overheat and burn.