I'm making a small rotary tool that can fit in a pocket. This is what I have so far. I just need a battery, charging method, and I'll 3D print the enclosure.

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Mini Cordless With 3.6v Li ion Battery 3 Rotation Speed - Temu

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ies For Sanding, Polishing, Drilling, Etching, Engraving, DIY Crafts at the lowest price at Temu. Free shipping and returns on tools & home

1 Set, Mini Cordless Rotary Tool With 3.7V Li-ion Battery, 3 Rotation Speed And USB Charging, Multi-Purpose Power Rotary Tool With 139/210Pcs Accessor

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NTD: I got this so I can buy full sheets of plywood & cut them in