Denis F:
IIRC the 24 volt ones have a capacitor in to avoid the power surge on start up .
And give you good knock across the workshop when you forget it’s there while fitting a set of new batteries. 
Denis F:
IIRC the 24 volt ones have a capacitor in to avoid the power surge on start up .
And give you good knock across the workshop when you forget it’s there while fitting a set of new batteries.