If you remove the battery pack does the laptop work just on mains? In which case it could be the battery pack which is goosed, or it could be the charging circuit inside the laptop.
Only way to check is to get borrow another laptop which uses the same battery - then you can check the battery in it, or your battery in the borrowed one. It should reveal where the problem is.
If you post your laptop make & model plus battery make & model here you may get someone responding with an offer
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