Electronics > Beginners
12v sealed lead acid battery has low volts
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jonovid:
I have a 12v 1.2Ah sealed deep-cycle lead acid battery that now has 8 volts.
charging has not fixed the problem, the battery still holds 8 volts
its like 2 calls are non-existent  :-//   electrolyte levels?
the battery is 3 ys old and is charged one a week for 12 hrs.
ejeffrey:
It certainly sounds dead.  Two of the cells might have shorted out.

You say it is charged 1/week for 12 hours.  Are you deep discharging it between then?  Are you sure it is actually being charged?
Gregg:
The best way to test it is to check the voltage with a load.  Something like an automotive brake light bulb that draws a couple of amps would work well.  If the voltage drops to almost nothing, there is an open circuit either within a cell or between cells.  If it maintains something over 7 volts, one cell is shorted internally; probably from plates warping and contacting each other.
IanMacdonald:
In my experience, if a SLA won't hold charge it is knackered. Attempts to revive them are rarely successful. Small sizes are cheap to replace and not worth the effort anyway.
jonovid:
yes it looks knackered  did have it under 1 amp load. the voltage  sits at around 8V  :horse: |O
the problem only showed, up after a deep and full discharge when I left the equipment on.
with deep cycle batteries they do not say how many deep cycles you get. no guarantees you get the full nine lives.
-  thanks
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