Hi @kingstonja14
If the battery is swollen it should be replaced as it may become dangerous and cause more problems if it is left in there.
Here's a link to the [https://www.asusparts.eu/en/asus/notebook/g-series/gx531gs|parts] for the laptop that may help. Use it to find the ''Asus part number'' for the parts etc e.g. battery - 0B200-03020000 and then search online using the [https://www.google.com/search?client=firefox-b-d&q=+0B200-03020000|part number only] to get results for suppliers that suit you best. Note: the stock notice of Unavailable only applies to the supplier in the link.