I haven’t had trouble with 3rd party batteries but there’s a combination of FUD and legitimate scare stories about them. For cylindrical cells, the really cheap ones are crap and this can be detect by X-ray:

hackaday.com/…/lumafield-shows-why-your-cheap-186…

IDK if there’s a similar deal with pouch cells.

Generally, replace your battery at below 50%. At 68% I’d keep using it. Maybe add a power bank if you want to keep going for longer. If 68% isn’t enough to get through your day, then 100% is at best sort of marginal.