Where do you find well-made batteries? OEM batteries for my X230 are no longer available, and I've had a hard time understanding which third party batteries are safe.
0A36307 is the OEM battery you are searching for the X230. I managed to get one manufactured in 2020 from a reputable distributor in Germany - in an original Lenovo box. But yes, they come at a price. However, after a battery that overheated, I'm willing to take the hit on this one.