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Old 14-05-2016, 13:48   #1
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Ultracell 250Ah Gel @13.15V at rest ??

Hi, I just purchased 4x 250 Ah UCG gel batteries made by Ultracell and to my surprise they are still at ~13.15 V after 2 days resting (not connected, still in their boxes). I was expecting about 12.8 V. Is this normal for gel batteries ??
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Old 14-05-2016, 14:09   #2
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Re: Ultracell 250Ah Gel @13.15V at rest ??

The exact voltage at 100% varies by chemical composition. A quick look at Ultracell's website didn't lead me to their specific documentation (which you should request to get the correct charging voltages and amperage rates) but I did find a reference to
AGM batteries which are sealed should be brought up to 2.35 volts and then discharged to a rate of 1.75 volts per cell...
so the 13.15V seems to be a reasonable open circuit voltage (2.35*6cells = 14.1V)
-Zanshin (SV Zanshin)
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