Anelok: look what the cat brought in !
werner at almesberger.net
Tue Mar 17 18:15:11 UTC 2015
It's a dead battery !
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
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:
This is what the cuts look like:
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
These are the cables on the top side (and a lot of flux):
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