Laptop not charging

I have a dell laptop inspiron I am not sure which one but it has a YRDD6 battery. my original charger got damaged and I have tried getting another charger then when I plug it in, it shows a warning saying that, the charger is not recognized and that makes the battery not to charge. can you please give me an advise on what to do, because I have tried to get a original 45w, 19.5V dell charger but I can't find it anywhere