You don't offer us any idea what the bike or battery is. And for something drained to that extent, recharging normally might be the next impressive youTube video of a e-bike battery fire.
While the battery should be able to hold a charge for a few months. Many things don't really turn off today and will be a very low but constant drain.
Have you checked with the bikes dealer or manufacturer about what should be done? Anything else and you should make sure you are near by to witness whether something starts going awry. But if the manufacturer or dealer only said to buy another battery, I'd be one of those that tries to revive it first. But probably outside and somewhere fire and fumes won't be an issue.
Welcome to BF
Welcome to BF!