Build a cheap ( < $30 ) temperature controlled soldering iron controller for Hakko 907 that can be powered from battery or power supply
The off the shelve HAKKO controller from Ebay comes shrink wrapped with display and buttons integrated on the PCB. To make it more useable and have everything integrated into a nice case, I first desoldered the display such that I can put it on the front panel of the case.
The DC/DC boost converter is a 150W version which is a good safety margin. I regulated the output to 22V as the manufacturer of the HAKKO controller suggest anything between 19V and 24V ...
While at my FabLab, I used the laser cutter to make a custom box with 3mm MDF. I use the following website to quickly prototype boxes :
Then you can add the necessary holes with your favorite CAD program.