The density or specific gravity of the sulphuric acid electrolyte of a lead acid battery varies with the state of charge see table below. Car battery load tests.
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Car battery testing voltage.
Car battery charge voltage chart. The table below shows the voltage and approximate state of charge for each type of battery. Battery load test from page 1 connect load tester and volt meter to battery apply electrical load equal to of cca rating for 15 seconds determine battery temperature with load still applied read battery voltage battery load chart battery temp acceptable voltage 120 f 101 vdc 110 f 100 vdc 100 f 99 vdc 90 f 98 vdc. I used a car battery charger to charge the 4 12v batteries separately.
Proactively testing it or making sure your mechanic does twice a year will help reduce your chances of failure. Other types of lead acid cells like car batteries lead calcium cells and rv deep cycle batteries will have different chargedischarge curves. Measuring voltage tells you about the charge of the battery but is not an accurate indicator of the health of the battery.
Check car battery charging voltage. Performing a load test is a reliable check of the batterys internal health. Last winter i parked the cart in my heated garage and did not recharge the batteries during the 3 12 month period.
I offer these graphs as examples of what to look for with your battery. By spring the batteries were so discharged thatmy cart charger would not work. The voltage versus state of charge soc profiles will match those of similarly constructed cells.
The figures are based on open circuit readings. Its important to test your battery and electrical system regularly not just when its starting to show signs of weakness. Battery voltage state of charge table.
I put together the following battery state of charge chart which indicates the state of charge percent as it relates to battery voltage or specific gravity. I limped through last summer having to charge to cart every 18 holes. State of charge 12 volt standard batteries battery state of charge is determined by reading either terminal voltage or the specific gravity of the electrolyte.
Most retailers offer a simple free five minute battery test. Battery hydrometer view the most popular hydrometer on amzn. That is when the deep cycle battery isnt under load and hasnt been under load for a few hours.
135 to 145 or more volts at idle should be produced by a charging system that operates normally. You should connect the voltmeter to the battery as before but not the charging voltage and this should be done after charging the battery or jump starting the car. In other words a battery might have a low charge and therefore a low voltage but still be a healthy battery.
Specific gravity is read with a hydrometer. And on the charts by two.
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