battery wont detect/charge

so i got a laptop that was broken. i replaced the mobo and now it works. when i turned it on for the first time it said the battery is not detected. i figured that it sat so long that the battery was junk so i got a new one. i plunged it in and it work! i could use my laptop without a charger. but it still said the battery was not detected. i figured it was maybe a mistake or something. then the battery died. so i looked up what it could be and they said it could be the charger. so i got a genuine charger. that still didnt work. then i looked up how to get it to charge. i followed the directions (software related) and it still didnt work. some people said it cant work if the battery is already dead. so i want to ask you guys what i should do considering i cant find anything about having a battery not being detected and not charging after all of what i just did. should i get another battery and then try? or could it be cause i got a new mobo? keep in mind the battery was working just not charging. im thinking i could maybe take my old charger that still works, strip the positive and negative wires and charge the battery that way and then try. idk, what do you guys think?