I bought a replacement battery that was not OEM off eBay. After about 4-6 months of use, the thing nearly blew up on me. The battery got so hot it could’ve started a fire. Seriously, spend the extra money, its not worth the risk.
If you’re buying a replacement make sure it meets the safety standards and it is approved for use. I’m going to be buying only OEM batteries/chargers from now on.
In the past I’ve had a different experience with OEM chargers dying on me and off brand ones surviving longer but that was in a place with frequent power cuts. In general your advice is probably best to follow but I’ve also used non-OEM replacements without any bad experiences for many different devices.