We’ve written about a couple of electric cordless soldering irons, but if you look through the comments you’ll quickly notice that our readers almost universally prefer butane-power when it comes to portable soldering. A number of them recommended Weller’s units (like the P2C pictured above).
The P2C reaches solder-melting heat in under a minute, and is adjustable between (the equivalent of) 25 and 75 watts of heat. It can reach temperatures of up to 850 degrees C.
The replaceable internal butane bottle provides up to an hour of continuous use, and a safety engages when you place the cap on, shutting off gas flow.
The P2C ships with a 2.4-mm double flat tip, and streets for around $40. If that’s not exactly what you’re looking for, though, Weller makes a number of other units with varying capabilities.