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This is why I pull apart old electronics, so I can keep all the reusable little screws and stuff for things like this.
Hell yeah. Laptops and phones tend to have a good variety.
Grab the batteries too - with the aid of cheap BMS boards, a dremel and a hot glue gun, you can convert all the crap you have which uses disposable batteries to rechargeable. Most stuff which uses two or three cells will work fine off a single LiPo with no regulator beyond what's in the BMS, otherwise you can get little step-up boards for more volts.
Feckin' Smallâ„¢
https://www.sjscycles.co.uk/gear-spares/shimano-strs505-name-plate-right-hand-y03n98010/
Try searching for Y03N98010 or asking SJS
This is why I pull apart old electronics, so I can keep all the reusable little screws and stuff for things like this.