It seems that it is near impossible to tell if aftermarket ones are descent quality, and that ebay and amazon are filled with loads of fakes/knockoffs claiming to be OEM.
For the ancient Lenovo N100 3000[1] I still use, I have bought three extended capacity replacement batteries on Amazon. I have been using the current one for 18 months with no perceptible degradation. The one before that lasted almost five years. Both AGPtek brand, sold by different sellers. So, that is a brand with which I have some positive experience. If they make a replacement battery for your laptop, it might be worth giving it a shot especially since they are not expensive.
[1]: https://www.nu42.com/2015/10/laptop-disaster-recovery-brain-...