I don't like the lights that have to be removed from the rail to change out the batteries (TLR1). I bought one years ago and while it works, I've bought different lights since that one.
I have a TLR7A on a 2.0 Compact .45 acp. Those have 4" barrels/slides and the front of the light is pretty much even with the end of the slide. On your 9MM with 1/4" more barrel/slide the front of the light would be slightly back from the muzzle. All you need to do to replace the battery is unload the pistol, insure it's unloaded and unscrew the lens cap. This one also has a "safety" for the light. Turn the lens till it stops and the light will not come on. Turn it just past where it first stops and you'll hear a clicking noise. After that noise and small amount of tightening turn the light will function normally..
Thought I had a picture of that one, but I don't. Sorry.