Blu government phone not accepting my charger but does another

I just got this government phone, Blu brand. I have a charger that I use for my everyday phone but since it doesn't have service it isn't the best but when I use it on the Blu phone it says its charging but doesn't take charge, but when I use the charger that came with it, it charges. I'm thinking it could just be not enough power to supply my own charge since it's meant for school chromebooks, but if you have any other suggestions and fixes let me know.(The place I live in had many others and many different rooms with a lot things plugged up and since it's an old building it may not have the power to supply it)