Circuit for sealed lead acid battery charger jump,change car battery radio wont work keyboard,car not starting battery and alternator good - Review

10.06.2015
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The circuit given here is a current limited lead acid battery charger built around the famous variable voltage regulator IC LM 317. To setup the charging voltage, power ON  the charger and hook up a voltmeter across the output terminals and adjust R4 to make the voltmeter read 28V. I Have 36 volt 10 AH lithium battery, can I modif 24V lead acid battery charger circuit, to charger my 36 volt lithium battery? Hello engr,in this your design.can i use it to charge two 12V,26AH lead acid battery connected in series?.if no,what is the implication?
Two 12 volts batteries of similar type and conditions can be charged up to a maximum of 7 AH only. Hi joe Two 12 volts batteries of similar type and conditions can be charged up to a maximum of 7 AH only. Hello engr,in this your design.can i use it to charge two 12V,26AH lead acid battery connected in series.if no,what will be the implication?
Hello would you be kind enough to publish a 48v 5 to 10 amp lead acid battery charger circuit ?
This charger can be used for single 24 volt 7 AH battery or 2nos 12 volts 7AH batteries in series. Hi Tran you can charge 24volt 1.3AH battery (hope dry means dry fit lead acid gel cell) also. Thank you very much for the charger circuit, i would like to use this circuit for charging two lead acid (12v 150A X 2)battery, for inverter.
Sorry, I can’t quite follow how the resistor R2 provides 700mA, can you explain how the calculation is done please?
I am looking to make an in-car charging system for an electric mobility scooter – it uses a 24v 10Ah battery. 1) can I substitute a 12v step-up DC-DC converter for the transformer and bridge rectifier section of your circuit to give me the DC input to the regulator, and what output voltage would the converter be required to supply? 2) what if any of the components of the regulated charger section would need to be changed to provide the correct output current and voltage?
I’m a big fan of your circuits,and I would like to ask about the possibility of modifying this circuit so we can control charging current (like a pot.
Hi Gangadhar you can but ensure the output voltage is adjusted to 14.2 volts without load with pot R4.
This simple charger is good for 6V lead acid batteries.The main part of the circuit is the LM317 regulator IC that limits the output voltage based on R1 and R2 values.
Note: If you need a more improve charger with current and voltage control, try to modify the automatic 12V charger circuit. The lead–acid battery was invented in 1859 by French physicist Gaston Plante and is the oldest type of rechargeable battery. As they are inexpensive compared to newer technologies, lead-acid batteries are widely used even when surge current is not important and other designs could provide higher energy densities. Lead–acid battery sales account for 40–45% of the value from batteries sold worldwide (1999, not including China and Russia), a manufacturing market value of about US$15 billion. Using a gel electrolyte instead of a liquid allows the battery to be used in different positions without leakage.
Camille Alphonse Faure invented a pasted-plate construction now typical of automotive batteries.
One of the problems with the plates is that the plates increase in size as the active material absorbs sulfate from the acid during discharge, and decrease as they give up the sulfate during charging.
Practical cells are not made with pure lead but have small amounts of antimony, tin, calcium or selenium alloyed in the plate material to add strength and simplify manufacture. Due to the high price of antimony, nearly all car batteries, valve-regulated sealed batteries, and most other non-industrial batteries have been made with lead–calcium grids since the early 1990s and possibly earlier.
An effective separator must possess a number of mechanical properties; such as permeability, porosity, pore size distribution, specific surface area, mechanical design and strength, electrical resistance, ionic conductivity, and chemical compatibility with the electrolyte. In the absorbed glass mat design, or AGM for short, the spacer between the cells is replaced by a glass fibre mat soaked in electrolyte. To address the formation of hydrogen gas during discharge, calcium is added to the plates to absorb the gas.
Another advantage to the AGM design is that the electrolyte becomes the separator material, and mechanically strong.
The only downside to the gel design is that the gel prevents rapid motion of the ions in the electrolyte, which reduces carrier mobility and thus surge current capability. Both gel and AGM designs are sealed, do not require watering, can be used in any orientation, and use a valve for gas blowoff. Most of the world’s lead–acid batteries are automobile starting, lighting and ignition (SLI) batteries, with an estimated 320 million units shipped in 1999.
Wet cell stand-by (stationary) batteries designed for deep discharge are commonly used in large backup power supplies for telephone and computer centers, grid energy storage, and off-grid household electric power systems. Traction (propulsion) batteries are used in golf carts and other battery electric vehicles. Lead–acid batteries were used to supply the filament (heater) voltage, with 2 V common in early vacuum tube (valve) radio receivers.
Portable batteries for miners’ cap lamps headlamps typically have two or three cells. CircuitsToday has provided a list of 4 great books to get a better theoretical and practical knowledge on the basics of electronics. Connect a battery to the circuit in series with a ammeter.Now adjust R5 to get the required charging current.


Input to the IC must be at least 18V for getting proper charging voltage at the output .Take a look at the data sheet of LM 317 for better understanding. Hi you can use for 8volt lead acid dry fit batteries (SMF) adjust output voltage for 9.6 to 10 volt, with R5 pot.
Did anyone have built one for 8v batteries or would have the specs for the resistance value for such. I am going to do a presentation about lead acid battery charger in one of my university courses, and your circuit really helps me, but i am not sure why you use BC 548, what direction of current flows around BC 548, and how does it works before and after battery fully charged. Hi Chenwie a lead acid battery should be charged through constant voltage with the current limited 30% of the rated capacity of the battery or with limited 10% for 12 hours. I am bit confused about the charging LED indication, Can you Please email me the connections for showing the Charging LED indicator which lights up when in the charging is in progress.
I have a 12V 5AH conventional (the one with cell caps where you may add distilled water) lead acid battery.
Further, what is the minimum required transformer voltage and current to get at least 15V rectified DC and 1.5A maximum charging current?
Furthermore, can you provide me with a pictorial diagram of your battery charger circuit diagram? Finally, do you have any updates on how to add LED indicators in this battery charger circuit diagram? I have a Well Understanding of Lead Acid Batteries charging after reading certain circuits over the internet. This gives 1.2mA as the max current going into the collector of Q1, which will only be this high at the start when you charge a 100% flat battery. A search on the element14 website for through-hole LEDs with forward current If=1mA comes up with one 2mcd, three 3mcd and one 10mcd LED! Hello Readers, We frequently add new circuit diagrams, so do not forget to come back often. The LT3755 is a DC DC controller designed to operate as a constant-current source and supports a wide input voltage range from 4.5 up to 40 volts and a can provide a maximum output voltage of 70 volts .
As per your requirement of 26 AH a power pack capable of maximum current limit of 7 amps (9 amps preferred) is required. Pls I need your urgent assistance in responding to these questions to enable me modify this circuit to do something else. I tried to insert a second BC547 as suggested (base of 2nd BC547 to base of 1st and emitter to the other emitter and collector to a led and a 2.7K resistor to C1 positive) to indicate full charge with no luck whatsoever! Pls can u send me the circuit diagram containing the charging indicator(green and red).pls send it to my email. The charger automatically turns the supply off when battery reaches its full charge voltage. Despite having a very low energy-to-weight ratio and a low energy-to-volume ratio, its ability to supply high surge currents means that the cells have a relatively large power-to-weight ratio.
Large-format lead-acid designs are widely used for storage in backup power supplies in cell phone towers, high-availability settings like hospitals, and stand-alone power systems. In 1859, Gaston Plante’s lead-acid battery was the first battery that could be recharged by passing a reverse current through it. Gel electrolyte batteries for any position date from 1930s and even in late 1920s portable suitcase radio sets allowed the cell vertical or horizontal (but not inverted) due to valve design (see third Edition of Wireless Constructor’s Encyclopaedia by Frederick James Camm).
However, such a construction produces only around one ampere for roughly postcard-sized plates, and for only a few minutes.
In Plante’s design, the positive and negative plates were formed of two spirals of lead foil, separated with a sheet of cloth and coiled up. Each Faure plate consists of a rectangular lead grid alloyed with antimony or calcium to improve the mechanical characteristics. The alloying element has a great effect on the life and water consumption of the batteries. Separators obstruct the flow of ions between the plates and increase the internal resistance of the cell.
There is only enough electrolyte in the mat to keep it wet, and if the battery is punctured the electrolyte will not flow out of the mats. This only works during slow discharges, and gas buildup remains a problem when the battery is deeply or rapidly discharged.
This allows the plate stack to be compressed together in the battery shell, slightly increasing energy density compared to liquid or gel versions.
When a normal wet cell is stored in a discharged state, the heavier acid molecules tend to settle to the bottom of the battery, causing the electrolyte to stratify. This converts the formerly liquid interior of the cells into a semi-stiff paste, providing many of the same advantages of the AGM.
For this reason, gel cells are most commonly found in energy storage applications like off-grid systems.
Lead–acid batteries are used in emergency lighting and to power sump pumps in case of power failure.
Large lead–acid batteries are also used to power the electric motors in diesel-electric (conventional) submarines when submerged, and are used as emergency power on nuclear submarines as well. I need the charger circuit urgently because the charger of my e-bike has got damaged and I need to charge the batteries. I was wondering if it would work with a 14AH SLA battery, and approximately how much time will it take to charge the battery completely if I increase the charging current with R5 POT.
You can ask for a 224K capacitor instead, that’s the same value but in picofarad instead of microfarad. It used this same LM317 charger ciruit and for a charge indicator they simply cut the circuit at the transistor’s collector and joined it up again using a red LED.


The circuit provides the correct voltage to charge the 12v sealed lead acid batteries or 12v SLA batteries. It has a led indicator that turns on when the battery is fully charge thus help you when are you going to remove the battery from the charger. These features, along with their low cost, makes it attractive for use in motor vehicles to provide the high current required by automobile starter motors. For these roles, modified versions of the standard cell may be used to improve storage times and reduce maintenance requirements.
Plante’s first model consisted of two lead sheets separated by rubber strips and rolled into a spiral.
Antimony-alloyed plates provide longer life but calcium-alloyed plates are much preferred over antimony for their eight times lower water consumption. Wood, rubber, glass fiber mat, cellulose, and PVC or polyethylene plastic have been used to make separators.
The area of the separator must be a little larger than the area of the plates to prevent material shorting between the plates. Likewise, the mat greatly reduces evaporation, to the point that the batteries do not require periodic refilling of the water.
When the battery is then used, the majority of the current flows only in this area, and the bottom of the plates tend to wear out rapidly. Such designs are even less susceptible to evaporation and are often used in situations where little or no periodic maintenance is possible. However, it is quite common to find resources stating that these terms refer to one or another of these designs, specifically. For your charging requirement of 12 volt 44AH battery a charger of 14.2 volt 12Amps is the requirement. Regulators part adopts switching power supply module TWH9312, wide input voltage range; interior also features over-current, short circuit protection, safe and reliable.
Without Q1, the circuit still works the way it is designed but there is a chance that it will take some time before it stops the charging, thus might damage your battery. Gel-cells and absorbed glass-mat batteries are common in these roles, collectively known as VRLA (valve-regulated lead-acid) batteries.
His batteries were first used to power the lights in train carriages while stopped at a station.
Initially this process used electricity from primary batteries; when generators became available after 1870, the cost of production of batteries greatly declined. The lignosulfonate prevents the negative plate from forming a solid mass during the discharge cycle, instead enabling the formation of long needle–like crystals. This combination of features allows the battery to be completely sealed, which makes them useful in portable devices and similar roles. This is one of the reasons a conventional car battery can be ruined by leaving it stored for a long period and then used and recharged. Gel cells also have lower freezing and higher boiling points than the liquid electrolytes used in conventional wet cells and AGMs, which makes them suitable for use in extreme conditions. With flat battery it will start at 12 amps and it will start tapering of as the terminal voltage increases slowly. In 1881, Camille Alphonse Faure invented an improved version that consisted of a lead grid lattice, into which a lead oxide paste was pressed, forming a plate.
Plante plates are still used in some stationary applications, where the plates are mechanically grooved to increase their surface area. The paste is pressed into the holes in the grid, which are slightly tapered on both sides to better retain the paste. The long crystals have more surface area and are easily converted back to the original state on charging. Diode D1 prevents the reverse flow of current from the battery when charger is switched OFF or when mains power is not available. This porous paste allows the acid to react with the lead inside the plate, increasing the surface area many fold.
It is possible to make lead–antimony positive plates and lead–calcium negatives, however, antimony is plated out onto the negatives and this causes the water-saving benefit of calcium negatives to be lost.
Stratification also causes the upper layers of the battery to become almost completely water, which can freeze in cold weather, AGMs are significantly less susceptible to damage due to low-temperature use. Once dry, the plates are stacked with suitable separators and inserted in the battery container.
Sulfonated naphthalene condensate dispersant is a more effective expander than lignosulfonate and speeds up formation. While it can be argued that calcium saves water and maintenance costs, it is almost never worth cutting the battery life from 20 years to 5. This dispersant improves dispersion of barium sulfate in the paste, reduces hydroset time, produces a more breakage-resistant plate, reduces fine lead particles and thereby improves handling and pasting characteristics.
For your transformer, convert it in full bridge type, meaning you need two more diodes (4 pcs of diode D1 in total). Sulfonated naphthalene requires about one-third to one-half the amount of lignosulfonate and is stable to higher temperatures. It will ensure also that the charger will not turn off unless the battery voltage reaches the full charge state..
What should be the values of R1 & R2 or what are the required adjustments to this circuit in order to charge my battery.



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