flashlights are a commodity these days. Most are rechargeable or use the a123 cells. There are still plenty of big and expensive ones but they tend to be novelities with huge and useless brightness.
Your garden variety better 18650 flashlight is probably more than you will ever need self defence aside. For example
https://www.amazon.com/Anker-Tactical-Flashlight-Rechargeable-Water-Resistant/dp/B01KH2JP5G/ref=sr_1_7?crid=1VM4IFCUD9Y8N&keywords=cree+flashlight&qid=1684768199&sprefix=cree+flashlight%2Caps%2C113&sr=8-7
Having owned a bunch of tacticool flashlights over the years, I am set on ones that use drill batteries. I have 7 dewalt batteries for various tools, and the trigger style form factor is better for long term use IMHO. If you already are in a battery eco system, I think buying that brands flashlight has the most utility. Especially if you have milwalkee they have a lot of options