I've only ever used the electric soldering irons, but a butane one sounds as if it could be a good idea for doing a quick job without the need to set up everything.

I had a butane one once, don't know what happened to it, but it was useful for quick jobs without having to wait for the electric one to heat up.

Butane ones are faster at heating up. But induction ones take a minute, once the trigger has pressed.

Used to do soldering a lot---now with the transmitters not many soldered connectors in these-just bolted connectors with huge lugs!

My soldering iron is very cheap i call it the poor mans soldering iron. All it is 6 volt lantern battery and two aligator
Clips and 60/ 40 solder and a mechanical pencil lead as my iron. It heats up way faster than any other battery powered iron i ever seen. Plus u can control heat by
Adjusting lenth of pencil lead. I even solder dip package
IC with it  many times. U cant do that with a cold heat iron
That battery power weller yea u have wait 30 sec to heat up. But this take 5 to 10 secs to heat up. Lot time i do this method when do short soldering work. Time it takes my soldering iron heat up do few joints. Let it cool down and put it away. And i am done in 1/3 of time.

My soldering iron is very cheap i call it the poor mans soldering iron. All it is 6 volt lantern battery and two aligator
Clips and 60/ 40 solder and a mechanical pencil lead as my iron. It heats up way faster than any other battery powered iron i ever seen. Plus u can control heat by
Adjusting lenth of pencil lead. I even solder dip package
IC with it  many times. U cant do that with a cold heat iron
That battery power weller yea u have wait 30 sec to heat up. But this take 5 to 10 secs to heat up. Lot time i do this method when do short soldering work. Time it takes my soldering iron heat up do few joints. Let it cool down and put it away. And i am done in 1/3 of time.

Got a photo of it ? I've seen a diesel engine glow plug being used for this but never a pencil ...

If  you took a pencil lead across a 6 or 9 volt battery terminal u can get nice glow. But u dont need a glowing
Lead to melt solder.  So u just clip one lead to bit of solder
And the other lead on pencil about 2 inches for low heat
And shorter lenth to increase the temprature on the pencil
Led.  Also 1 inch number 2 pencil makes  good emergency
Incandescent lighting on 12 volt  battery.  until carbon get consume with air. Carbon is resistive but conductive.

On butane soldering irons I'm strongly missing some a thermostat function. It does not have to be that much accurate at all, +/-25degC (for max to min gas flow or for the hysteresis thresholds) regulation range should be by far good enough while still possible to make in a simple, pure mechanical form (e.g. a bimetallic thing controlling the gas flow), but the existing ones are very very difficult to set so they have sufficient heating power when using and on the other hand wont overheat when idling for some minute or so. Mainly because the operating position tends to affect the gas flow rate in very unpredictable manner.
I may understand it is not present on the cheapest models, but the expensive ones may have tons of fancy features (integrated ignitor,...) but even a simple thermostat is still missing.

Lamp battery soldering iron-at least with these no worry of induction into circuits as from AC powered soldering irons-interesting idea-would be good in emergencies as well.Some of the solder connections in the transmitters you use the small welding torch or the toolbox butane torch.both work in this situations.We have the small soldering irons and guns in the shop for PC board work.and solder suckers,too.

Lamp battery soldering iron-at least with these no worry of induction into circuits as from AC powered soldering irons-interesting idea-would be good in emergencies as well.Some of the solder connections in the transmitters you use the small welding torch or the toolbox butane torch.both work in this situations.We have the small soldering irons and guns in the shop for PC board work.and solder suckers,too.

Direct connection of low impedance 6VDC source into the base of some BJT, or to data pin of some IC while its VCC is not powered, and possibly in the reverse polarity, will damage them much more readily than microAmperes of induced current

Yes been doing this merhod  for a while and all i am doing is 1 pin at time on Dip IC. If i am n space too tighrt where
I can touch both pins at same time then it going to be a
Problem. And i am soldering some Cmos chips
Even using this method doing one pin at a time

Depending on how you solder, you might apply the voltage momentarily between a pin and its PCB pad (while they are not yet connected to each other), closing the circuit through the component, some other pin, and the PCB tracks instead of directly through the pin which you are soldering

@Lightingguy1994. Heres the Weller iron that I have, that is still in it's original packaging, however the packaging did seen better days.

They're certainly good irons, but a little OTT for PCB work 

You have the same one that has a trigger, @MissRiaElaine?

You have the same one that has a trigger, @MissRiaElaine?

I did have one a while ago, but not now. I only have a couple of 15W Antex irons, one of which is 12V for use in the car (when I had one..!). I don't do all that much now, when I first got my amateur radio licence I was building all sorts of stuff, but then other things tended to take over, not least of which was resurrecting my lighting collection after many years away from it.