That's a 18350 battery in it so you can estimate the size. I was planning on squeezing a 18650 battery in it at some point but I'd of needed a different button. It does feel like a good one, I'm feeling a little sad to let the tin goThat looks a good size, can imagine that feeling quite good in the hand. (Oooer)
Nice one, as long as it works and he appreciates it that's what matters. .. looks ok in spite of precise tools and if you can make one you can get further tools and fine tune it over time... looking forward to seeing more that you make in future
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