Just wondering if there is a way to power the T5 externally. Preferably a way to plug it into something like a “juice box” or any external power supply via USB port.
I saw an AC adapter, but I need something that I can use while shooting outside.
No DSLR that I'm aware of, and certainly not the T5, can draw power through its USB port. If you're going to be hiking or something, I guess you'll just have to carry extra batteries.
If you're going to be doing something stationary, like astrophotography, you could use a diesel or gasoline-powered alternator and plug the camera's AC adapter into that.
Do they make something like that with a male USB connection instead of the actual prongs that plug into a wall outlet?
No. The voltage coming out of a USB port is too low to charge your camera’s battery.
It is possible to use external power with dummy battery to extend the dslr shooting hours.
Of course there are a lot of other suggestions online. You may use a battery grip and install 2 batteries to double your shooting time.
I am not sure if Canon has the dummy battery for this particular model but it is a very common method to use dummy adapters for dslr and mirror-less. I have used them on my cameras using LP E6 batteries with success.
There are a lot of tutorials online. Google them.
The dummy battery has a wire with two connection points + and - like all DC powered devices. They have different connectors. You have to find the right connector to adapt to a USB power bank. It's simple like that.
Have you actually spent 5 minutes of your time viewing the Youtube instruction which I have posted earlier ?
This video provide a straight forward solution to your need. Don't just ask and ignore the answer.
BTW, compatible DR E10 with DC cable is only $10 or less.