nuckolls.bob(at)aeroelect
Guest
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 Posted: Tue Mar 12, 2019 10:23 am Post subject: Single cell charge/testing hack |
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My rooftop weather station started running out
of battery snort (shortened and cloudy days
reduces effectiveness of solar maintainer).
Decided to replace the cell but wanted to install
it with 100% charge (4.1v open circuit).
It's an odd size cell (CR123A) for which I
don't have a holder. Some years ago I began
"putting the squeeze" on certain cylindrical
cells to either charge or test said cells:
[img]cid:.0[/img]
Here you see the cell captured between the jaws
of my little bench vise but with a piece of
RESILIENT insulating 'pad' at the (-) end
of the cell. This avoids shorting the cell and
mitigates crush forces. The frame of the vise
becomes the (+) terminal, the wire captured
under the bottom of the cell on top of
the pad is the (-) connection.
Hooking it to a bench supply set for 4.1v
and 0.050a gives me a constant current/constant
voltage source with which to top off the cell.
Here we see that the cell has reached 4.1v
and the charge current has begun to drop.
I'll leave it hooked up until the current
drops to 5mA or so.
This same rig can be used to grab a single-cell
for discharge tests. This technique precludes
having to acquire and maintain a stable of odd
cell holders for simple maintenance tasks.
Bob . . .
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