Hi Dylsz, After disconnecting and reconnecting you may have to reset one touch automatic window open/closing system, just hold the Window switch's down for 10 seconds, up for 10-15 seconds, And you will probably have a lot of warning lights afterwards but these should all go out after a short drive!
I've attatched methods for both depending on where your battery is located.
The car may store a temporary low voltage fault in some modules but this won't cause any issues and can be cleared with a scan tool if you require but if not they won't affect the car at all