TeamSpeed wrote in post #18405693
We have had tear downs of the factory vs Wasabi batteries, and the same cells were found in both. Not sure about Sterlingtek, but as a general rule, people found that the Sterlingtek would often outlast the factory battery. You could always try that test, or contact Sterlingtek, they are pretty good about replacing batteries. Perhaps a replacement would behave more to your liking?
This is what I have been saying here all along - there are not many cell manufacturers in the world. Panasonic, Sony, Samsung are probably the biggest, and they supply them to many battery pack manufacturers. Then there are Pylon, A123, NEC, Phat, and a few others, who are also vendors to many battery companies. Canon does not make cells nor does it build batteries. As a rule, any large manufacturer like Canon has to have at least two suppliers of battery packs, and each battery pack manufacturer has to have at least two sources of the cells.
That all means that one as easily gets a faulty OEM battery as a third party one. Remember Samsung Note7 cell phone fires? It happened with batteries from two different manufacturers.
My recommendation - keep buying third party batteries, and replace them when they fail. Still cheaper in the long run that OEM's, and no guarantee that Canon brand means a peace of mind.
BTW, a part of my everyday job is managing battery testing for my employer's (a very large company) suppliers.