Any suggestions for a battery one?
I have three that I personally own and use and it just happens that I brought them all home to clean all the tips this weekend so I can show you pictures.
My original was a TS100 which was one of the earliest battery powered electronic soldering iron offerings. It's a superb iron, it's customisable and it's been a very good workhorse for site use over the last 4 or 5 years. It will run on anything between 12-24VDC and I use it with a little 14.8V 1550mAh LiFePo battery which means it won't run at its full 65 watts power but it's very portable with the small battery and it's more than powerful enough for all my soldering needs at that voltage. As you can see from the photo it's taken a hiding from many weeks if not months of general site abuse over the years but it still works perfectly. It takes a barrel plug for power and there's a micro USB post for programming it with your own custom code if that's your thing.
My second battery iron is a Pinecil-BB2 which I use in our workshop. I don't need extreme portability with this application so I use it in conjunction with a 20000mah power bank that can handle PD3 / QC3 USBC and give a 100 watt output, it also has an option for a barrel plug for power as well. I've never properly tested the runtime but he iron runs at a full 65 watts on this powerbank for days. This iron doesn't get the same abuse as the TS100 and it's about 2 years old but it's been great to use and reliable. It was however cheaper than the TS100.
My third iron is a Fnirsi HS-01 which is only about a year old. It was also similar price to the Pinecil and considerably cheaper than the TS100 but I only bought it for occasional use at home. Again I use it with another 20000mah powerbank with a 100w USB-C output that has PD3/QC3 compliant power output negotiation but a barrel plug and battery can also be used. I've only used it probably half a dozen times for maybe 15-20 minutes per occasion so I can't really comment on long term reliability and durability. It works very well and I haven't found anything to complain about.
The Pinecil and the Fnirsi are basically knock-off copies of the TS100 which was the original iron of this type. There's a few differences between them but nothing that would be a deal breaker or even a decider unless you have very specific requirements. They're all accurately temperarure controllable to within a couple of degrees, they're all extremely fast warm-up time; they reach 380c in about 20 seconds and they're all powerful enough to solder at least 10mm CSA stranded wires for example. Finally they all come with a good wide range of tips available. It's probably worth mentioning that the TS100 and the Pinecil use the same tips but the Fnirsi tips are slightly different design so I wouldn't recommend trying to use them in the other two irons. The TS100 has also had several upgrades since I bought mine so please do some of your own homework and check the lastest specs. Incidentally I have a Hakko hot air rework and solder station in my workshop and the Hakko soldering iron tips are also interchangeable with the TS100 and the Pinecil so if you want to get high quality tips for one of these soldering irons the Hakko T12 tips, whilst being a bit longer could be a good option.
EDIT I forgot to mention all three of the irons can take a barrel type power plug, the fnirsi only has a USB-C socket on it but it comes with a small adaptor cable to allow a barrel plug, the Pinecil and TS100 can accept a barrel plug directly into them so with a bit of jiggerypokery and some kinda Amazon adapter you can also run them off your 18 volt cordless power tool batteries.
I've also got a graveyard of old gas soldering irons dating back to the 1980's including Portasol Beha and Weller versions, I was raised with these things but I wouldn't go back to one having now used these electronic soldering irons.