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Archive for December 6th, 2009

Digital Concepts AAA NiMH Cells: Craptastic!

The AAA cells I mentioned there bubbled to the top of the heap on my desk again, so I charged them, let them sit around for a few days to stabilize, then ran a discharge test.

The top (black) trace is all four AAA cells in series; the two steps correspond to the two weakest cells failing. The red trace is the surviving two cells. The green trace is the strongest cell, which supplied current during all three traces.

They’re nominally 900 mAh, but the results are pretty much what you’d expect.

No-name AAA NiMH - Sequential Discharge

No-name AAA NiMH - Sequential Discharge

The most durable cell, the last one to fail with the green trace, had a capacity of a bit over 500 mAh: slightly over half the rating. The weakest cell (the first step on the black trace) failed after a mere 250 mAh.

Junk. Pure junk. I’ll give ’em another charge just to see what happens, but don’t hold your breath anticipating a resurrection.

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