Camera EOS Rebel t6s
I use two cameras. One is Canon Rebel T6s. I always take the battery out of T6s camera for charging. But for the other camera, I always charge its battery in the camera every time after down loading the the new images. Can Rebel T6s do the same? and does it cause any issues?
The manual states that you need to use the charger (page 32). Note that Canon's support page for the T6s doesn't provide a link to the manual, but I was able to do an internet search for it that found it on some documentation web site.
You also mention two cameras. Are they both the Rebel T6s? I only see one camera model listed in your question.