iPhone 5 battery won't charge after I replaced it

My iphone 5 had water damage and i could not switch it on anymore. i replaced the battery recently though just to see if it might work, and it did! but now the new battery won't charge, i plug it in but i see no charge indicator on the screen. it died on me yesterday, i don't even get the red lightning indicator + cable on the screen anymore. what other parts of the phone could be causing this? is it the lightening connector or the logic board or something else?

how can i verify before ordering more replacement parts?