Suggest me a small light

Looking for a keychain flashlight I can modify. My only requirements are for it to be able to take a rechargeable battery, and take a standard size driver and MCPCB. Also it needs to have some sort of lanyard hole to put on a keychain. Size max 0.6"×3.5".

PS I read some of the older threads but didnt get much from them lol

A friend modified the Astrolux K1, it is brighter now. a round pcb wouldn’T fit, but you can file it down and put it in sideways (insulated).

SF10 if you want a cheaper host. SP10B can do all without modding and has a side switch tho.

I know you can also use a 10440 on a AAA if you want but those aren't so standard. Chip type as in 7135? I just use a thrunite Ti3 clone, I love it.

Should clarify, a chip type LED, as in not those circular ones. And would I be able to use a 14430 in the place of a AA?

Thanks, may go with this one, love the stainless steel

Tool AAA