Brightest small light is the 4000 lumen Nitecore T4K. At that price though, practically, I’d much rather have a Nitecore E4K (Big difference in runtime between a 5 amp 21700 and a 1 amp built in battery).
True. Just get a ten pack of Harbor Freight magnets for about $3 and it works fine with unprotected cells that can handle the current (use 3 magnets). Works great with Molicel P42A cells. Those Nitecore usb-c rechargeable cells are expensive. I found it better to get the 80 lumen high cri lantern/powerbank/charger/21700 battery kit for $35 for my spare 15 amp rated protected cell. Gave me a backup light, phone/ light charger, as well as an i series battery that can be used in the E4K or one of the more expensive model lights if I got one later. Sometimes I don’t want to have to carry magnets with me.
I guess you were referring to the 14500 battery Lumintop FWAA which puts out 1400 lumens. For a light that size, without a built-in battery, I’d go with an Acebeam TK-16-AL with 3 XPG-3 l.e.d.s for 1800 lumens from a 16340 battery. However, that l.e.d. option seems to be gone now and the remaining Osram l.e.d. option only puts out 1300 lumens. So with that in mind, your light wins by default.