Nowadays these bulky sk68(reference number 4)with varying quality are not the best bet in my eyes but I am sure that a lot of people would be amazed with it.
I like these small AA zoomies(reference number3) more. Smaller and my versions are despite it wasn’t written in the description with 3 modes: high, low , strobe.
10 pieces cost with BLF coupon 29.81$ At banggood…
Batts: https://www.fasttech.com/products/0/10001898/1136600-nice-15v-3000mah-aa-lithium-batteries-2-pack
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Reference thread