Hello.
Picked up a 65" TCL last summer. The factory remote is going through batteries about every 3-4 months....crazy. I don't ever remember changing a remote's batteries more than once a year.
You can try some lithium batteries. If you don't use the voice search function, you can unpair the remote and just use it IR. If it's still under warranty, TCL may send you a new remote, but that's probably about average battery life.
Regarding the voice function: There may be a small switch in the bottom/center (near the power LED) to disable the function. I bought a 65" TCL last Fall and that's how it is arranged.
I bought a Sony TV a couple of years ago and eats a pair of AAA in about a month. I went to rechargeables. The remote has voice command but is activated by button.
It has backlit buttons when moved, so I figure that's probably the main draw.