I need help with my camera

I have a canon powershot s300 and i bought new batteries and a compatible charger for it, but the new battery doesnt seem to work(?) i charged it over night and the camera’s telling me its low battery and to change the battery pack. I also tried to charge the old battery that was originally in the camera but it still shows low battery and tells me to change the battery pack. Are the batteries faulty? Or the charger? Pls help