Battery change

Hello dear CR-V municipality, have a little concern: my aunt in Russia drives such a CR-V BJ 2008, unfortunately has no further information about the vehicle at the moment. So why did she get a new battery today and it does not work anymore, no ignition absolutely nothing, so she told me at least. Battery was changed in workshop, so they had to have it connected properly. has someone experienced this already? What information about the vehicle are still benöti gt? I thank MfG in advance for the tips and suggestions