I am not a big fan of batteries, charging, and things that require electricity to work.
Is there a Fuel based flashlight that exists? I love the idea of filling up the handle and setting off... My batteries always seem dead or weak, and honestly they seem really inefficient.
I recently started using white fuel hand warmers and cannot believe at how well they perform over batty powered hand warmers... The best thing about them is if you need more than 10 hrs of hot hands u can just refill it.
Id love to have something akin to a fuel lantern condensed into a flashlight.
Well that's certainly your choice to not like electricity and modern technology that uses it to function but you wouldn't be here (posting this question) if not for it. So I'm kinda guessing that you are talking about when you go camping or exploring or whatever other outdoor activity it is you do.
They call them torches. I of course am referring to the stick and fuel kind, not the English (UK) word for an electric flashlight. Also as others have already said, there are lanterns designed to use a fuel source although using a liquid fuel has a down side too. It can be spilled irrecoverably while refilling and generally requires specialized containers to carry the extra in.
Also posting these remarks in a forum for battery powered flashlights and essentially asking if there is something that doesn't use batteries and not returning to comment even once in two days, seems a bit troll-like in nature. I'll not berate or criticize your personal preference, but the reason battery powered flashlights are a thing is because they are a better solution to the personal lighting dilemma than what we initially had, namely burning lengths of fibrous material soaked in a fuel. Torches.
I don't doubt that with modern technology focusing on using white gasoline as the fuel source that someone could make such a tool for providing light for outdoor activity, but...why would they? We have an entire industry built to make these wonderful little light sources that use a power source already long in development and readily available in common sizes and chemistries that can be found almost anywhere.
On that note...these little power houses of technology are in essence just "liquid" fuel which has been packaged in such a way as to be more convenient, safe and easy to use than the old fuel cans of the 19th century. The only real difference is that the chemical reaction in these little "cans" is used specifically to generate electricity, which over-all has far many more uses than a simple flame. Because of that they can be used in many more tools and devices than the old liquid fuel before them. However it does mean that using them for the specific purpose of heating, is far less efficient than burning fuel directly.
Personally I prefer electrically powered illumination tools. An LED converts electrons into light far better than does a cotton wick convert fuel into light. Now a gas mantle...that's different, but my electric torch can function upside down and under water as well as being highly resistant to shock and vibration. I don't think you can get a gas lamp to do that.