If you're using it powered all the time, have you checked out the existing plug in "fake battery" options? Here's one example: https://www.amazon.com/Glorich-R

If you're using it powered all the time, have you checked out the existing plug in "fake battery" options? Here's one example: https://www.amazon.com/Glorich-Replacement-Adapter-Cameras-Fully-Decoded/dp/B00VNJLBPK/ref=sr_1_4?dchild=1&keywords=EOS+R+plug+in+battery&qid=1608645060&sr=8-4 https://www.amazon.com/Glorich-Replacement-Adapter-Cameras-F...