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So a reasonable thing to do is buy raw cells from a nominally reputable supplier, do a heart transplant, and see if that improves the situation.
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Frankly, I didn’t expect much and here’s the discharge test graph to show I wasn’t disappointed.
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Show me an order of magnitude
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A recent power outage killed the regularly scheduled events, which suggested that the backup batteries needed changing…
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It turns out that the laser beam in the top picture is about 10 mils wide at the center point, so you can easily see a difference of 1 mil in the Y coordinate.
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Brandishing a heat gun in a threatening manner solves that problem.
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This is about a stainless steel socket head cap screw I installed eight years ago.
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The Smell of Molten Projects in the Morning 