IMO, it would be best to start off with a couple of new batteries but the old ones you have should 'work'.
Considering they started off as fairly low quality batteries ( 7a ish ~ 10a maximum CDR) and have been used, how well or how long they'll work is impossible to say, as batteries are used & age capacity declines.
Always buy batteries from reputable vendors / dealers such as;
RTD Vapor
Illumination Supply
Lighthound
Orbtronics