Definitely have a look at these:
https://www.aliexpress.com/item/1005006116003272.html
Buy a good 18650 (Nightcore/Samsung) and you have got a pretty solid torch that lasts a few days. I have 3-4 floating round, and take 2 away with me - one as effectively a battery holder, but always handy when your buddy forgets theirs (all too frequent)
Focus is pretty basic but works, good to prob 50-60m. USB-C charging. You can get similar double ones with red lights too. For about $16-17 delivered, you can't go too far wrong. I don't expect them to last for ever, but they've currently outlasted anything branded at 3-5x the price. Two are 3-4 years old without failure.
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