[RE-wrenches] Fwd: Battery Specific Gravity versus Electrolyte Level

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> Begin forwarded message:
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> From: Jeff Myles <jeff at rollsbattery.com>
> Subject: Re: [RE-wrenches] Battery Specific Gravity versus Electrolyte Level
> Date: February 9, 2021 at 8:54:04 AM EST
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> Cc: 
> The main reason the manual instructs not to top up all cells before equalizing is to avoid overfilling to/up in the vent and having a spillover when they bubble. 
> 
> We suggest inspecting and topping them up after because they also go through water running the equalization. If a cell is noticeably lower than others it would make sense to top it up slightly to bring the electrolyte to a similar level as the others before beginning the process.  If it's just one cell in the bank I would expect the SG reading on that one will be off from the others to begin with. If it's going through more water than others it's getting hotter.  Why?
> 
> Lower liquid level doesn't always equate to higher acid concentration. The SG reading in the cell with lower electrolyte would only read higher than others if the cell, like the others, wasn't suflated.  If it is sulfated, the SG readings at full charge are lower because the sulfate has accumulated on the plate and not released back into the electrolyte during charging.
> 
> First, he should check all cells at float charge before beginning the equalization so he knows where they're all starting from. Is the cell with the lower electrolyte level reading higher or lower SG than the others?  Are the rest completely balanced and this one is off?
> 
> SG readings immediately after equalization and before adding water will be elevated due to temperature. To get accurate readings after adding water he should cycle the batteries 2-3 times, allowing it to mix normally, and then check SG at float charge. SG results after an equalization are accurate after the bank has been cycled a few times. If cell(s) were sulfated, they will continue to desulfate as they're cycled normally so the results aren't immediate.
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