How can I mend/replace my MAC Allister drill?

I have 4 sets of Mac Allister drills they all use batteries MBAT18-LI the Chargers are MC18BS-LI and the wire on them have all broken as it was just made of thin wire so not built to last. I can't find a replacement for the chargers. Will it work with a different type of charger or are they generic to MAC Allister? Also is it fixable? The attachment that the battery attaches to has screws on but the charger is a sealed unit.