My phone won’t turn on, I think it might be the battery, can anyone confirm this?

It is a very ancient buzz, an Alcatel. Anyway i have had it about 2 years and I used to leave it to charge for long periods of time (when I wasn’t using it) I realize this wasn’t a excellent thing to do. And now when I try to turn it on it doesn’t, even when I try to charge it not anything happens. I know it is hard to judge seeing as its over the internet etc.. but I was just wondering if you reflect it may need a new battery? and roughly how much would this cost?

Thanks in advance.

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