__
           |  |  You dont get good devices anymore that can deliver easily
        ___|__|  above 20A. There is e.g. the VaporGiant for 26650 but its
       |life- |) 32.5mm in diameter and regular RDA´s in 25mm doesnt really
       |po4   |  match good in my opinion. Eventhough I am not convinced of
       |power |  the switch design for high current draw at all.
       |house |  Its also quite expensive buying original. The design of my
       |______|  Box follows a simple MOSFET-wiring-diagram.No hot button!!!
                 For safetyreasons I added 3x 15A resetable fuses in parallel.
       This maximum current of 45A multiplies with ca. 3V of the battery
       up to 135W max output. My comfort zone is something around 50W - 80W.
       More than enough tho.
       I have to build a little bit lower for lifepo than for lipo
       because of the lower operating voltage. Its about 1-2 wraps less.
       I experimented with 22G stainless steel wire but a build with
       24G or 26G is still better for me. Same as for lipo. I went down
       to 0.1 Ohm and theres is no hot battery. You can detect a warm spot
       on the side where the MOSFET is located.
       
 (IMG) Pic1 with Kennedy24
 (IMG) Pic2 with Kennedy24
 (IMG) Pic3 with Kennedy24
 (IMG) Pic4 with Ulton Fev25
 (IMG) Mosfet wiregram