17.03.2014

Car battery voltage vs state of charge indicator,rechargeable battery 5v 2a charger,battery for small car - Tips For You

Author: admin  //  Category: Replacing Car Battery


To check your battery's state of charge, connect the RED or POSITIVE voltmeter test lead to your battery POSITIVE terminal.
The photo at the top of this page shows a battery voltage reading of 12.29 volts, which means the battery being tested is low with only about half a charge. If your battery voltage is less than 12.45 volts (75 percent charged), it is low and should be recharged. Automotive lead-acid batteries should be maintained at a 75 percent charge level or higher for best performance and life. A good battery is essential for reliable starting, especially during cold weather because cold weather increases the cranking load on the battery. Warning: Do NOT attempt to recharge your battery if it has run down and the liquid inside is frozen. A GOOD battery is one that will accept and hold a charge, and is capable of producing close to its rated amperage output. Most car batteries only last about 4 to 5 years, so if your battery is 4 or more years older and is not holding a charge (keeps running down), or it does not seem to crank your engine a normal speed, you probably need a new battery. A low or dead battery does not mean your battery has failed, or that it needs to be replaced. CAUTION: Conventional wet cell car batteries are filled with a mixture of water and sulfuric acid.
The other (and must faster) method for testing your battery is to use an electronic "conductance" tester like the one shown here.
Some electronic battery testers can also analyze the battery's CCA capacity, which can be used to estimate the battery's remaining service life.
Diagnostic Tip: You also can use a digital voltmeter to check for voltage drop across all circuit connections, too.
Whether your battery tests GOOD or BAD, make sure the battery is fully recharged before returning it to service. Diagnostic Tip: If the alternator on your car has failed, it might mean your battery is not building up normal resistance as it accepts a charge. A replacement battery must have the same post configuration as the original (top post or side post), and fit the battery tray.
Next, you have to figure out how many CCAs the vehicle needs for reliable cold weather starting.
Another number that is important is the months of prorated warranty coverage provided by the battery manufacturer.
While working with car and deep cycle lead-acid batteries, please help to prevent blindness and wear glasses in the unlikely event of an explosion. If you have a sealed battery or need to troubleshoot a charging or electrical system, you will need a digital voltmeter with 0.5% (or better) DC accuracy, such as a Fluke 73-3 or 175. Surface charge (or "counter voltage") is the uneven mixture of sulfuric acid and water along the surface of the plates as a result of charging or discharging as the electrolyte has an opportunity to diffuse in the pores of the plates. Allow the battery to sit (or rest) without discharge or charge for between six to twelve hours at room temperature, if possible, to allow for the surface charge to dissipate.
With a battery load tester, apply a load at one-half the battery's CCA rating for 15 seconds and then wait ten minutes. Disable the ignition, turn the engine over for 15 seconds with the starter motor, and wait ten minutes. Apply a load that is 33% of the ampere-hour capacity for five minutes and wait ten minutes. The State-of-Charge only measures the state of the battery's charge and not it's storage capacity.
Measure Specific Gravity of each cell of wet, non-sealed (with filler caps) lead-acid batteries with a hydrometer or Open Circuit Voltage of wet and VRLA batteries with an accurate (.5% or better) digital voltmeter. Based on the electrolyte (or ambient) temperature and the measurement, determine the State-of-Charge from the appropriate temperature row and SoC column in the table selected. Using a hydrometer to measure the Specific Gravity is the most accurate way of determining a wet, non-sealed (with filler caps) lead-acid battery's SoC. A hydrometer is an inexpensive a float-type device used to measure the concentration of sulfuric acid (Specific Gravity) of battery electrolyte ("battery acid"). If the battery has been charged or discharged within the last four hours, remove the Surface Charge. Wear some glasses, preferably safety glasses, in the unlikely event that a battery explosion or electrolyte spill might occur. While holding a clean hydrometer vertically, squeeze the rubber bulb, insert the nozzle into the electrolyte in the cell, and release the bulb. To increase the accuracy of the measurement, in the same cell, repeat this process several times so the float will reach the same temperature as the electrolyte. At eye level and with the float steady, read the Specific Gravity at the point the surface of the electrolyte crosses the float markings. If the hydrometer is not temperature compensating, measure the electrolyte temperature and use the appropriate temperature row and SoC column in the Specific Gravity vs. Determine the battery's State-of-Charge by taking the average of the cell readings, but the battery's performance will be based on the weakest cell. If the battery is sealed, then use an accurate (.5% or better) digital voltmeter to measure the battery's Open Circuit Voltage (OCV) to determine the SoC.
If the State-of-Charge is BELOW 75% using either the Specific Gravity, voltage test or the built-in hydrometer does not indicate "good" (green or blue), then the battery has a low charge and needs to be recharged before proceeding. If there is a .050 (sometimes expressed as 50 "points") or more difference in the specific gravity reading between the highest and lowest cell, you have a weak or dead cell(s). If the battery will not recharge to a 75% or more State-of-Charge level or if the built-in hydrometer still does not indicate "good" (green or blue), which indicates a 65% SoC or better). If a moderate load is applied and if there is no or very little current flowing there is an probably an open cell or a completely sulfated battery.
With a battery load tester, apply a load equal to one half of the CCA rating of the battery for 15 seconds.


With a battery load tester, apply a load equal to one half the OEM cold cranking amp specification for 15 seconds. Motive and stationary deep cycle batteries and car batteries with amp hour or Reserve Capacity ratings can be capacity tested using a slow discharge load test.
If the battery is fully charged, the surface charge has been removed, and you know the Amp Hour rating of the battery, then you can test the capacity of a battery by applying a specific load and discharging the battery of it's rated amp hour capacity as defined by the battery manufacturer. If the battery is fully charged, the surface charge has been removed, and you know the Reserve Capacity (RC) rating of the battery, then you can test the capacity of a battery by applying a constant 25 amp load and discharging the battery of it's rated Reserve Capacity in minutes as defined by the battery manufacturer. A battery with 80% or more of it's manufacturer's original rated capacity is considered to be good for most applications. In a well ventilated area, you should recharge your battery to 100% SoC as soon as possible to prevent lead sulfation and to restore it to peak performance. When the non-sealed wet battery (with filler caps) has cooled to room temperature, recheck the electrolyte levels and, if necessary, fill to the correct levels with distilled water.
I would recommend a high amperage charge (25-35 amps) to try to restore the voltage level, and then run a test on the battery to see if it is still good.
Does anyone know what the spec is for our alternator's voltage output at the battery terminals? A car alternator can recharge both wet cell (Panasonic battery that came with 4Runner) and AGM batteries. However, a car alternator is not like a smart charger that you use at home and the biggest difference between the two is the length of time it takes to achieve the best charge to replace what has been drained out of the battery. So a car alternator absolutely can recharge an AGM battery given enough drive time to replenish the amps.
With any battery, strive to avoid going below a 80% charge state and never leave a deeply discharged battery sitting. I have had a Sears DieHard Platinum as my starting battery for about 3 years and it is always in a great state of charge.
My DieHard only runs whatever is in the truck and the biggest draw (although brief) is the starter. Note that a car alternator is only workiing when the engine is running and that the amps and voltage out are affected by engine RPM.
In that chart a battery is considered fully charged around 12.6 volts but the best method of charging a depleted battery in a short time involves specific phases and controlling the amount of current and voltage. From what I have seen in my 4Runner the alternator tries to approximate the first two phases.
Comentario do psp:Preco de entrada mais baixo para uma viatura tecnologicamente mais evoluida, penso que vale a pena esperar uns meses.
Aqui esta o “novo” Nissan Leaf!"Mais autonomia, mais eficiente, mais acessivel, mais equipamento e menos peso.
Some testers can also measure the amps drawn by the starter while cranking the engine, and analyze charging system output under load once the engine is running.
This, in turn, makes the alternator keep charging the battery at a higher than normal rate. As a rule, the higher the warranty months on the battery, the higher the battery CCA rating and the better the battery.
Though all automotive batteries today are still based on lead-acid chemistry, redesigned grids, thinner plates and new connectors allow more amps to be packaged into smaller cases. It measures low current draw for 20 hours while maintaining a minimum post voltage of 10.5 Volts at 70 degrees F. Also, check the negative battery cable ground connection and the integrity of any engine ground straps.
A digital voltmeter (or multimeter) can be purchased at an electronics store for between $20 and $200. If the electrolyte levels are below the tops of the plates, add enough distilled, deionized or demineralized water to cover the plates and recharge the battery, allow to cool to room temperature and then top off the levels. With a battery load tester, apply a load is one third the battery's amp-hour rating for five minutes and wait five minutes.
If the battery has not been substantially charged or discharged within the last four hours, the ambient or surrounding air temperature can be used. When printed, this Excel spreadsheet produces a single page that contains table with the Specific Gravity and Open Circuit Voltage measurements by temperature vs. When the SoC measured by a hydrometer does not materially agree with the SoC measured by an accurate digital voltmeter, it is probably due to sulfation. From this reading you can easily and accurately determine a non-sealed battery's State-of-Charge. The electrolyte will be sucked up into the barrel or container allowing the float to ride freely.
If you are measuring a large battery, stratification can occur when the more concentrated electrolyte settles to the bottom. When the SoC measured by a hydrometer does not materially agree with the SoC measured by a digital voltmeter, it is probably due to sulfation. If the battery is sealed, the battery could have low electrolyte, especially in a hot climate. Applying an EQUALIZING charge per the battery manufacturer's procedures may correct this condition.
A shorted cell is caused by plates touching, sediment ("mud") build-up or "treeing" between the plates.
The primarily purpose of a car battery is to start an engine, so the battery ability to produce high current is the most important capacity test. Most auto parts and battery stores have battery conductance testers and some stores will test battery capacity for free. A DC ammeter and an adjustable resistive load, for example, 12-volt lamps or variable resistor, are required for this test. There's a possibility that the battery won't hold a full charge, and needs to be replaced - but you'll need to try to bump the voltage on it to get accurate results.


It turns out that the charge profile from an alternator is not ideal for replenishing large battery capacity drains in a short period of time. A home charger will give you a very reliable charge in a shorter time and given how expensive the AGM batteries are it is a good idea to protect your investment. What it boils down to is: how many amp-hours did you drain from the battery and how much driving time was there to put the amp hours back in? This is why the Optima battery folks like to say that an alternator is mainly good for maintaining a battery's state of charge. A good charger does not need much more than 12 amps to handle an AGM battery so a 130 AMP alternator is overkill for battery charging but is sized that way to simultaneously charge the battery and supply current on demand for the whole car. I looked at the Odyssey web site and their suggested charging approach mirrors what I have pasted. A car alternator is not designed to exactly follow these patterns that a smart charger employs. Current is sent to batteries at the maximum safe rate they will accept until voltage rises to near (80-90%) full charge level.
Voltage remains constant and current gradually tapers off as internal resistance increases during charging. So consider upgrading from a basic 36-month replacement battery to a premium 72-month battery. AGM technology also makes batteries more resistant to vibration damage and helps extend battery service life. Alternatively, some auto parts or battery stores in the United States and Canada, like Auto Zone, Sears, Wal-Mart, Pep Boys, etc., will test your battery, charging system and starter for free.
The plates need to be covered at all times to prevent sulfation and reduce the possibility of an internal battery explosion.
Larger wet lead-acid batteries (especially over 100 amp hours) could also have electrolyte stratification where the concentration of acid is greater at the bottom of the cell than near the surface.
If you suspect that a battery is sulfated, it probably is, especially if it has not been charged in a while or has been continuously undercharged. A hydrometer is a glass barrel or plastic container with a rubber nozzle or hose on one end and a soft rubber bulb on the other.
If you notice a difference in the readings between the top and bottom of the cell, average the two readings.
If so, try and equalize the the battery by following the battery manufacturer's procedures or the procedure in Section 9. The OCV readings for a battery at 100% SoC will vary by plate chemistry, so if possible, check the battery manufacturer's specifications for their State-of-Charge definitions for the battery being measured.
Longer drive times can accomplish it but otherwise putting a smart charger on the battery at home will take better care of the battery. Can the voltage regulator output from the alternator be modified, I wonder, without damaging anything. Batteries are an important subject and we if we can all cite sources and facts we can have a great discussion and help each other out. If you want a no-fuss charging method you would go with an external AGM capable battery charger.
This is often referred to as a maintenance or trickle charge, since it's main purpose is to keep an already charged battery from discharging. Una de las nuevas opciones sera un sistema de vision que nos facilitara la labor de ver a los vehiculos que tenemos en los angulos muertos, un extra para la version basica y presente de serie en los otros dos acabados, a lo que podemos sumar el sencillo pero no menos importante sistema de arrancada en pendientes, que bloqueara el vehiculo hasta que pisemos el acelerador, algo muy util para arrancar en cuestas pronunciadas.Nos queda por saber cual sera el equipamiento de esta version en Europa, pero de momento sabemos que elementos como las luces tipo LED, los faros antiniebla las llantas de aleacion y los mandos en el volante pasaran a ser opciones y no formaran parte del equipamiento de serie de la version basica. Analog voltmeters are not accurate enough to measure the millivolt differences of a battery's State-of-Charge or output of the charging system. Inside the barrel or container, there is a float and calibrated graduations used for the Specific Gravity measurement.
En cuanto a una de las principales peticiones de los usuarios, Nissan por fin ha optado por ofrecer un interior en un elegante color negro, ademas de nuevos tonos para el exterior. Do not use a 12-volt test light to troubleshoot vehicle electrical circuits, except for testing the parasitic load at the battery, because you might damage the emissions computer or other sensitive electronic devices. Stratification can be eliminated by an equalizing charge, stirring or shaking the battery to mix the electrolyte. Some sealed wet "Maintenance Free" batteries have a built-in hydrometer, "Magic Eye", which only measures the State-of-Charge in ONE of its six cells.
As the battery discharges, the resistance will have to be decreased to maintain the constant discharge load, at five amps in this example. If the car battery fails the load test a second time or bounces back to less than 75% SoC, then replace the battery because it lacks the necessary high current (CCA) capacity. A good source of information on measuring voltage and for maximum voltage drops can be found at Exide's Caring For Your Battery. The Specific Gravity readings for a battery at 100% SoC will vary by plate chemistry, so if possible, check the battery manufacturer's specifications for their State-of-Charge definitions for the battery being measured.
Para alem disso, um novo sistema de iluminacao em LED facilitara os carregamentos em zonas de pouca iluminacao.O sistema de navegacao tambem foi alvo de melhorias por parte da Nissan.
Espero que para a Europa possa ser trifasico, mas provavelmente nao sera assim pois envolve grandes alteracoes no motor e inversor.
Another way of testing the CCA (Cold Cranking Amp), amp hour (AH) or Reserve Capacity (RC) of lead-acid car or deep cycle batteries is using an electro-chemical impedance spectroscopy (EIS) tester, such as a Cadex Spectro CA-12 or a conductance tester, for example a Midtronics. Second, we are able to offer the kinds of upgrades that our customers want to use, based on customer feedback,” said Chief Vehicle Engineer Hidetoshi Kadota.We spoke to Nissan North America early this morning, and understandably they are not keen to announce anything ahead of their own 2013 LEAF launch. A sulfated sealed battery's voltage often will read higher than the SoC actually is, so capacity testing maybe required to determine the battery's actual condition.



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Comments to «Car battery voltage vs state of charge indicator»

  1. AnXeS writes:
    Should go exchange your batteries if you're current limiting.
  2. R_O_M_E_O writes:
    Doors, one is brand new and has.
  3. tatlim writes:
    One, they took half his stomach constant current will cause.