These are neat little irons, you have to supply your own power supply, but you can run them off lipo batteries pondside if you want... https://amzn.to/2uUtZzV Don't know how long the deals good for, discount code is TS100BC2 ggets you to $33.99 before taxation
Lot's of Chinese 12 to 24v irons on Amazon in the $12 to $16 range. Not many reviews so who knows the quality. View: https://www.amazon.com/Electric-Soldering-Adjustable-Temperature-Welding/dp/B07D34JCYT/ref=sr_1_30?s=hi&ie=UTF8&qid=1532529430&sr=1-30&keywords=24v+soldering+iron
The TS-100s are fairly popular with the drone guys and some 3d printing folk I deal with. Its a far better piece of kit than that POS you've got linked there for 15$. The TS100s pile up positive reviews. For instance, here's the bang good listing https://www.banggood.com/MINI-TS100...-in-STM32-Chip-p-984214.html?cur_warehouse=CN
Look no further than the Hobby King battery iron. works fine with an XT60 connector to a LiPo. Even better with the Dr. mad thrust (where do they come up with these names?) controller. It allows power level adjustment and appears to be a controllable current limiter. I Got one when I started building retro slot cars solder ing brass sheets to music wire and doing motor wiring a well as Ham radio wiring boards - and needed a portable system when we go to dog shows that my wife competes in. It has worked very well. News Flash - it is an actual HAKKO pencil and marked as such. The full system is just a fancy power supply to power the 12 ish (actually 6-18v) volt pencil. Have used one for 3+ years with various tips from pinpoint to 2,3 and 5.4 mm.
