Captive means it’s held in place by something else, like the twist head on the Convoy Tiny. A captive twist head won’t continue to unscrew and come off. All buttons are captive.
I’m quite happy to go for 3.7v-only, or even a sealed battery. There are plenty of the 10180 lights that are rechargeable and small enough, but all the ones I’ve seen either don’t meet the interface criteria or have wierd charging port placement (or entirely separate chargers), plus the lifetime generally sucks
Sofirn was the first place I looked as I’m the owner of an SF11 myself but this is a gift for someone who found the interface a bit complicated.
The SP10 has more options than the SF11 so that’s out of the picture. It’s also a little larger than I’m really after, the smaller AAA lights that can get lost in a pocket or just about fit on a keyring would be ideal.