LightDreams wrote:
I have extensive use comparing top rated third party batteries for Nikon with Nikon original batteries.   So this may or may not be similar when it comes to Canon...

The best of the third party brands was as good as or, in some cases, stored a bigger charge than the Nikon originals.  However, between 1 1/2 to 2 years later, the third party ones deteriorated significantly more (in terms of how much of a charge they would store) compared to the Nikon.  As time went on the difference became more and more pronounced.

BUT you also have to keep in mind that you typically got two of the better rated third party brand batteries for less than half the price of one Nikon original battery.  So you could certainly afford to replace them much more often.

How that all works out in the wash, is up to you to decide.  I wish I could tell you how similar, or not, that comparison is when it comes to Canon batteries.  But if you do go with a higher rated third-party brand, at least you have an idea of what to watch for, further on down the road.

I am insane and I use both Canon and Nikon. I went through a phase of wanting to learn both camera systems. I tried my hand at aftermarket batteries. I noticed with my Nikon the aftermarket didn't last as long after a few years. However, I have had my Canon since 2015 and I bought aftermarket batteries from Amazon. I am still using those batteries in 2022. They seem to hold a similar charge. If there is a reduction in quality, it isn't as noticeable as my Nikon was. In 2022, I am using my Nikon less. It has become more of my back up camera. I like to run with two cameras because I have had cameras malfunction when I am being paid by a client. I loved I could pick up my back up like nothing happened. My pay day isn't ruined.