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Quad 18650 power supply

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Might not have been such a great idea to 3D-print this DIY supply I made in red: (it does look slightly alarming, I’m afraid) This is a little portable power supply I made a while back, with four very common type-18650 cells (widely available from eBay, despite today’s air shipment regulations). It has the following properties (“specs”): adjustable voltage from zero to ≈ 13V maximum current 3A’ish (see below) with (slow) USB charger built in built with low-cost parts from eBay tape + hot glue to keep it together I’m tired of wires running all over my desk - this is one way to try and cut down on some of that while tinkering with electronics.

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