I found a super cheap rechargeable soldering iron that has a built-in lithium-ion battery and can be used without a power source, so I'd like to introduce it to you! It is made of high-quality stainless steel and is about the size of a pen, so it can be easily carried around. It can be used conveniently in places where there is no power source, such as outdoors, in a car or on a motorcycle! What is its amazing performance? Why is it so cheap? I will introduce the results of my research and experiments along with my personal views! I bought the rechargeable soldering iron introduced this time on Amazon! ・Rechargeable soldering iron with 3 tips 2,200 yen (as of December 12, 2023) https://amzn.to/3uT0DUn It has power that cannot be compared to battery-operated. Unless the wiring is very thick, you can solder without any problems! It is made of high-quality and clean stainless steel, is about the thickness of a pen, weighs about 45g, and is easy to carry in your pocket. It also comes with 3 tips, so I think this price is a bargain! Sorry for selling out! There are many similar products, including cheaper ones, but be careful of those that are not shipped by Amazon. I broke it in the video, so I'm going to buy another set! (tears) *Additional note: It seems that there is also a type that does not have the 3-tap constant-on function and can only be energized for 60 seconds. ・Replacement iron tip C type 669 yen (as of 12/12/2023) https://amzn.to/47QGxbW If you buy the tip alone, it costs quite a bit. The set with the frequently used C type above might be a good deal! ・510 type VAPE main unit 930 yen (as of 12/12/2023) https://amzn.to/3Nl78p2 Since it is a 510 type, I think it can also be used as a soldering iron if you attach the tip of this iron. (Unconfirmed) It's cheap, but the battery was only 350mAh (but even smaller) ・A super cheap soldering iron set with temperature control that I love to use for frugal DIY 1999 yen (as of 12/12/2023) https://amzn.to/3spXhDi This one is convenient for regular use as it can be used with AC100V. It also has many accessories and is great value for money! Additional research results ・The built-in 13700 lithium-ion battery can only be charged up to a maximum of about 0.32A. (Due to the charge control IC) It seems to be a slow charge with an emphasis on safety, and it takes just under 3 hours to fully charge. The light is red while charging, and when it is fully charged, it automatically stops charging and the green light comes on. Battery capacity measurement results At a constant current discharge of 2A from full charge to 2.5V (discharge rate is about 2C), the capacity was 1043mAh (3.70Wh) and the discharge time was 31 minutes and 20 seconds. The rated capacity of 1100mAh (4.07Wh) is assumed to be the value for 1C discharge, so it is natural that the capacity that can be extracted will be less than this with a high-rate discharge of 2C. I think this value with a 2C discharge is not bad!