The battery builders club

Kester cored solder has worked great for me, I don’t use any additional flux. That stuff is filled with it.

Just get this stuff and you should be set. I use the same gear

https://www.amazon.com/gp/product/B07PYFSCJ9/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B00068IJQI/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

That iron goes up to 500C and 120W. Included chisel tip works great. If you get the technique down, it can easily produce very good joints:

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