It's a dead battery ! http://downloads.qi-hardware.com/people/werner/anelok/tmp/cr2032-1047h.png
1047 hours is pretty close to the theoretical 1077 I calculated from the nominal capacity Sony publish and the guesstimated age of the cell. I also checked the resistor: my meter reads 14.886 kOhm at about 32 C. That's within 1% of the nominal value of 15 kOhm. So the battery did perform pretty much according to expectations. What I didn't expect was that it would drop relatively quickly to 2.8 V and make its stance there, instead of remaining closer to 2.9 V for a while. And I now also have a clearer idea of how temperature affects these cells. Now that the multimeter is free again, I can finally begin to test operation on battery power. I already reworked one of my boards and it is still happy, at least on USB power. As a reminder, this is the the rework plan: http://downloads.qi-hardware.com/people/werner/anelok/tmp/boost-rework.pdf This is what the cuts look like: http://downloads.qi-hardware.com/people/werner/anelok/tmp/boost-rework-cuts.jpg This time I used my Dremel with a small endmill, 12 mil diameter, and the result is much cleaner than what I normally get with a knife. These are the cables on the top side (and a lot of flux): http://downloads.qi-hardware.com/people/werner/anelok/tmp/boost-rework-cables.jpg - Werner _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
