One can't tell from the info available.... I am assuming you are
talking about automotive-type lead acid batteries in the 12V
1) Has it been sitting for 5-6 hours since the last charge cycle ?
at least that much time for the "space" charge to dissipate for
2) Terminal voltage as an indication of "state of charge" is
dependent. 12.3 is a bit low, but it doesn't mean the batter
It may mean that the "state of charge" is low and recharging is
3) Your best test is to go and buy a specific gravity tester which
for two or three bucks at an auto supply section. While SG is
temperature dependent, it is a much better indication of the
of charge. The instrument will have directions on how to
4) Your best bet is to first measure and record the SG for each
cell, and then charge the battery at a low rate, say 3-4 amps,
for a day. Then disconnect the charger and measure the SG
This will let you know if each cell can accept a charge, and
evenly they are charged..... In an automobile environment,
usually the end cell closest to the engine block that goes
I'm not sure why, but I've seen this a lot of times... Probly
5) Check the water level in the battery. If you have to top it up,
distilled water, and don't believe any SG readings for a while
the SG tester will pull the "uncharged" water off the top and
an indication of the true state of charge until use/vibration/
has caused the water to fully mix with the electrolyte.....
Just a few tips.... If you google on "lead-acid battery
you can spend a few minutes learning a lot about how they should
be charged and measured.
Andy in Eureka, Texas
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