Battery issues

[Mjb203]

Hey everyone, since ive bought my car ive been having issues with the battery.. It just drains overnight and ill charge it and it will be fine for a couple days then drain again. I jump started it today and let it run for a while and slowly watched the volt meter drain until it died. I tried to jump start it again and it wouldnt hold enough juice. Surely its the battery right? Or could it be something else. Money is tight for me right now because i just moved to florida and dont have a job yet and i would like to be sure before i buy a new battery. Thanks

[Toybrota]

My old ae92 did this and it was the most annoying thing ever.

Your alternator might have gone bad, that's what happened to mine. I ended up having to buy a rebuilt one :/