Lead battery specific gravity john,eveready 12v rechargeable battery review,car battery low cost - For Begninners

Resources, Tools and Basic Information for Engineering and Design of Technical Applications! The SG-Electrode is designed to measure the specific gravity of the electrolyte, and therefore state of charge,  in a flooded lead acid battery. Measuring the SG of battery electrolyte effectively involves determining the amount of water and sulfuric acid in the mixture.
A refractometer uses only a drop of electrolyte to measure specific gravity, and is more accurate and easier to use. A technician checks the specific gravity using a refractometer and reading its illuminated internal numeric scale. IntermediateSpecific gravity (SG) is defined as the ratio of the density of a material to the density of a reference material—with liquids, this is usually pure water. With flooded LA (FLA) batteries, each battery cell’s SG should be measured and recorded at the time of installation, but only after an initialization charge. Once the batteries are in service, each cell’s SG should be measured annually to identify problems like unequal charging or if the battery is not getting fully recharged. Charging the battery to a full SOC before testing the SG will result in more accurate readings, as the electrolyte will be better mixed and cell voltages more balanced. Stratification of a battery, where the electrolyte becomes denser at the bottom of a cell and less dense at the top, occurs frequently on tall, high-capacity LA cells that are not fully recharged. When drawing the battery electrolyte into the hydrometer, first squeeze the rubber bulb and then insert the hydrometer into the vent opening on the battery.
And correct me if I'm wrong but doesn't desulfating battery plates restore the SG of a battery's electrolyte by putting the sulfur back into solution? My back up system is cheap (by necessity) and my battery "bank" consists of 2 car batteries that I swap out.

It admittedly takes a long time to bring back a heavily sulfated battery but I've been able to accomplish a lot without even having to lay out the cost for deep cycle batteries.
No, you cannot accurately determine battery state of charge by looking at its instantaneous voltage, which is what that "tester" does.
The main thing that desulfation does is remove the crystals that prevent the electrolyte from fully contacting the lead plates.
It's good that you are hands-on enough to get by with refurbished car batteries, but most people want more reliability and less maintenance, and to be able to more deeply cycle a battery with less impact on the battery's life span. Christopher - You say an SG reading is the only way to detect stratification, but don't say how.
Also, I've found it extremely important when taking an acid sample up into the hydrometer to make sure the glass bulb floats freely and doesn't "drag" on the sides as acid is introduced. More accuracy is provided by measuring the specific gravity of the electrolyte in the battery (assuming that the battery is not of the sealed type).Measuring the Specific Gravity of a BatterySpecific gravity is measured with a hydrometer.
For lead-acid (LA) battery electrolyte, the amount of acid dissolved in the water determines the SG.
These initial readings will serve as a reference for comparison over time, and will also verify that the battery is in good condition.
After this charge, but prior to taking the SG reading, do not top off the battery with water in an attempt to replace the electrolyte lost to gassing or your SG reading will be inaccurate. Low-cost hydrometers are readily available, but refractometers and higher-quality hydrometers may need to be specially ordered.
I also do what I can to keep them conditioned by using a Pulse Tech Xtreme charger that both does the diagnostics and desulfating while it's charging. If a battery is fully at rest and been charged completely, you can get a rough idea of its state of charge, but not as accurately as measuring specific gravity.

I do not know how much of it goes back into the electrolyte and how much ends up at the bottom of the cell.
Simply draw the battery acid into the hydrometer so that the float is not touching the sides, top or bottom of the barrel. A battery electrolyte’s density is a direct indicator of the battery cell’s state of charge (SOC)—and can also reveal the relative health of that cell compared to others.
If there is a significant imbalance between the SG of the cells in a newly initialized battery or if the electrolyte does not reach a “full” SG reading after charging, contact the battery manufacturer or supplier. If left to persist, stratification will damage the battery by corroding the lead plate at the bottom while allowing the top of the plate to become sulfated and inactive. A section of the float is calibrated with a scale so that when it is submerged in water it will read a value of 1.000 (or 1,000). Keep the tip of the hydrometer in the cell while slowly releasing the rubber bulb, drawing the electrolyte into the glass tube.
When the liquid being tested has a higher density, the float sits higher in the liquid, indicating a higher SG value on the scale. When reading the scale on a hydrometer, be sure that the scale is read using the bottom level (the meniscus) of the liquid’s surface. Take a look on eBay UK where the search battery hydrometer usually brings up a good selection of suitable hydrometers. Applications include solar and wind power battery storage systems, remote power backup batteries, submarine battery monitoring and off-grid power supplies.

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