Don't know how accurate this old thing is, but s.g. of all 3 cells
looks to be about 1.15.
Open vs shorted vs neither was a question I had. How to tell the
difference? My thinking, like John's was that an open cell would show
zero s.c. voltage. If shorted, 4.xx volts. But, how to tell the
difference between a shorted cell vs a very tired battery? If two of
the 3 cells were ok, would not the s.g. in those cells be considerably
higher than in the shorted cell, after charging?
Meter I'm using is a Fluke DMM.
<Not so fast! If the problem is a dead cell, not a shorted one,
sometimes a
long, slow equalization (for a golf car battery, constant current at
around
3-5 amps from something between several hours and several days ) may
be able
to get you going again. >
I'm aware of this, just haven't figured out how to do it yet. The
only charger I have that's not 10A is 12v, 2A.
I found it interesting--because I don't understand it--that the old
big charger, on wheels, reads about 7.5 volts (between battery posts)
when set on 6v/10A. The small portable charger reads 9.5v when set on
6v/10A.
So far I've used the big charger on it for close to 10 hours and
haven't seen the 4.10v move a bit.
Thanks again.
Thon
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