A type of very common chemistry system used batteries using lead and sulfuric acid. fully charged it will have a voltage of 13.8 V. These batteries are used in automotive and robotics environments.

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What is the effect of pulsed discharge on watt hour (Wh) efficiency of lead-acid batteries?

When discharging a (lead-acid) battery you see a voltage increase (volts rise) as soon as the discharge is paused. source: http://uu.diva-portal.org/smash/get/diva2:461718/FULLTEXT01 In the quest ...
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2answers
46 views

Recommended approach to create a lead acid battery level circuit

I want to build a battery level indicator circuit for a 12 V sealed lead acid battery. The battery indicator circuit will have two functions: It will power 4 LEDs to show the level of the battery ...
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1answer
46 views

Variable Current Lead Acid Battery Charging

I'm designing a solar controller in order to charge SLA batteries. I did some research on dedicated ICs that act as controllers, and found that most implement some sort of MPPT, in order to extract ...
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75 views

Creating a battery backup unit

I live in a area with frequent power failures lasting up to 5 hours. During this time I would like to power my router so that I can still use the internet with my phone/PC. I've looked at UPS ...
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1answer
30 views

charge a 12v battery from a cigar lighter

would I be right in thinking that to charge a 12v 7 ah sealed lead acid battery from a cigarette lighter socket on a canal boat, I would need to wire a bulb into the positive lead of the connecting ...
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51 views

Advice Running 3 10W 12V COB LED on a 12v7AH lead acid battery

I am planning on buying this LED ...
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56 views

Charging a bank of lead-acid batteries in paralel

I have a lead-acid battery similar to the one in the picture (mine is 15Ah) and I also have a spare car battery (50Ah). Is it safe, or a good idea to put them both in paralel to achieve a bigger ...
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33 views

Safe discharge cut off point for 12v SLI calcium lead acid battery

I want to make a circuit that cuts off a mains power inverter connected to a vehicle's battery. I have found, however, SLI batteries come with very sparse specifications. For example, the Varta E43 ...
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1answer
53 views

Solar charging using or not using a dummy (dump) load

I'm in the process of designing a small solar regulator / charger (no more than 5A) for sealed lead acid batteries. I have put a working prototype together and all seems to be working. However, ...
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33 views

Determine lead acid battery safe float charge level for a range of state-of-charge

My question: I want to know how to determine the highest safe voltage for a given SoC (state-of-charge). Or for a given float charge voltage, determine the lowest safe SoC. Helpful hints to the ...
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38 views

Lead Acid Battery [closed]

Hi so I was taking apart this old machine and found a 6v lead acid battery. I don't know lead acid batteries and I measured the voltage to be at 200mV. Now I'm pretty sure that this is bad and I don't ...
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41 views

Charging Lead Acid Battery from dynamo

I want to build a Lead acid battery charger. for that I want to use a small IC engine coupled to a dynamo and the dynamo I got is rated at 12V, 35A and I want to charge 12V 7.5 Ah Lead Acid battery. ...
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60 views

Fast rising voltage on lead acid battery while charging

i have a couple of 12V sealed lead-acid batteries.Whitch i have to charge.But when i hook one of them on the charger at 12V/1A (the battery is 10Ah) the voltage from 12.6 drasticly increases up to 14V ...
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140 views

What is the charge-discharge (Wh) efficiency for lead acid batteries at different SoC and charge current 10-35A/100Ah C10?

There is a 1996 Sandia study with the title "A study of lead-acid battery efficiency near top-of-charge and the impact on PV system design" for charge and discharge lead-acid battery amp hour [Ah] ...
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1answer
62 views

charging lead acid cells

And I have forklift battery 24V which is almost at the end of life. The 24V charger is very strong and heat battery and not working properly. I have one 12V battery charger, which works very fine. ...
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31 views

Grounding A Circuit of a Power Tool Battery Charger to Use as Car Battery Charger [duplicate]

I took a charger that matches what I need to charge a car battery. The charger uses a transformer and has 3 connections, as does the battery it's intended for (+/-/T). When I plug the + and - alone ...
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2answers
117 views

Modifying a Simple Transformer Circuit

I have a heavy 14.4V 1.5A heavy battery charger I would like to use to charge my car battery (over time, monitored for heat in a well ventilated area). When I plug the battery to the charger as is, ...
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2answers
117 views

Can I charge a Lead Acid Battery with a Lithium Ion Battery Charger [closed]

Can I use a charger meant for lithium ion batteries (eg a charger for a drill) to charge a lead acid car battery. It charges at 14.4V which is what I'm looking for (and will limit to 2Ah with ...
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0answers
73 views

Are car batteries smart-charged?

I use controller based(smart) chargers for my car and motorcycle batteries when they are not in use. Reconditioning options on those actually extend the life of the batteries. Especially in colder ...
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4answers
143 views

Would a sulfated lead-acid battery charge at 2.1V per cell?

I'm trying to charge a 6-year-old OEM lead-acid battery in a 2008 Volkswagen Jetta with an external charger, whilst it's still connected within the vehicle. (The battery was working fine, until it ...
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0answers
55 views

Buck Converter with lead battery source

I have a buck converter using the ST1S14 step down converter. The design was tested with a AC to DC converter source in the lab. With 12V DC supply the circuit performed well delivering currents upto ...
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0answers
138 views

440AH 12V Lead Acid batteries discharging too quickly?

I've got 4 x 110AH 12V Orange Juice Trust brand Lead acid batteries connected in parallel to 1000 Watts of solar panels. The batteries are about 6 months old. According to the readings on my MPPT ...
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2answers
123 views

Measuring internal resistance of a battery while it's being charged

I was startled to hear that there are devices out there that can measure the internal resistance of batteries, in circuit, while the batteries are being (trickle-)charged. For example, Hioki markets ...
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1answer
97 views

Charge condition of lead acid battery

I need to monitor the charge condition of an 8V lead acid battery. For monitoring purposes, I used a Beagle Bone Black running Linux. It is also supplied via this battery. The battery also supplies ...
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2answers
2k views

What is a safe max. discharge rate for a 12V lead acid battery?

I've got a 12V 2.4Ah lead acid battery which I plan to connect a water pump to. I've looked at various pumps, but the one I'm most interested in draws 2.2A. I'm not so interested in how long the ...
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1answer
118 views

What can be the consequences of charging a lead-acid battery with an excessive voltage?

In my field-operating device I use a simple PWM step-down to charge a 6V 3.9Ah lead-acid battery from a 5W solar cell with a voltage of 7.2V. Unfortunately the DC regulator got damaged today and the ...
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1answer
141 views

Can my dead Lead Acid batteries be reused?

I have two 12V 4.5Ah sealed Lead Acid batteries from an old electric scooter. The scooter is a decade old, and packed up a few months after purchase. The batteries were literally left as is for ...
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1answer
64 views

Lead Acid max discharge rate?

I am building a flashlight using a large(ish) 35W HID headlamp from a car, and I'm having troubles choosing a good battery technology. The inverter draws about 3.5A - 4A at 12V, tested on a large ...
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76 views

Plante Lead acid battery formatting/forming process

Is there a description anywhere that explains the physical process for Plante lead acid battery formatting?
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104 views

Equations to charge a lead acid battery with constant voltage strategy

Typically there are 3 zones to charge a lead acid batteries.In the first step, the battery would be charged with a constant current and after a specific SOC, constant voltage strategy would be applied ...
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1answer
133 views

Lead-acid battery charging [closed]

Have an unbranded lead-acid battery charger and a small 6Ah 12V battery. After about a year of purchasing the set I need to charge it for the first time. For car battery jump start I vaguely remember ...
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2answers
240 views

Charging 12V SLA from Single Solar Cell

I'm interested in charging a 12V Sealed Lead-Acid battery from a single monocrystalline solar cell. The solar cell's voltage is only 0.5V at maximum power point, but it supplies 8A. I will need a 32X ...
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1answer
89 views

Filtered Voltage for charging Lead acid battery

I am creating a temporary setup for a lead acid charger, using a rewound Microwave transformer, a bridge rectifier, and a giant filter capacitor (30,000µF). Wound turns until I got 14 volts filtered ...
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2answers
1k views

How do we charge a small 12V battery from a large 12V battery bank

In a youth organization that I am part of we are building a traveling stand alone system, which will be put up on various fairs and music festivals. On one of the festivals there is a wish that we can ...
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3answers
140 views

Please help me understand this charging algorithm

I am trying to plan a stand alone system, and for that I will need a charge controller. I am looking at a few models from the company MorningStar. I have understood what MPPT is, and decided to not ...
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3answers
153 views

What happens if I connect two lead acid batteries in series, one fully charged and one half charged?

I am interested in several things: What happens right when I connect them? How does this behavior affect the batteries, both short term and long term?
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3answers
1k views

Can be lead-acid battery charged using NiMH or NiCd charger?

I would like to check total capacity of 64Ah lead "car battery" ^ by fully charging it and currently I have only older intelligent charger (Robbe Power Peak 8467 – page can be switched to ...
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5answers
1k views

Why is balancing used for lithium batteries only?

I have never heard of a lead acid battery having any electronics to balance it's cells, or even any manual way to balance them. But I think all lithium batteries have, or at least lithium batteries ...
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205 views

how much time it will take to charge a 48v 35amphr battery using a solar panel of 20w

please help me out with this problem.I have tried several sites , but i didnt get a specipic method.please kindly include formulas used also.
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191 views

Charging lead acid (car) batteries with a common ground

I have three identical lead acid batteries. All three batteries are on a common ground since they power different components on a same circuit. I have three independent "intelligent" chargers whose ...
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1answer
356 views

Input voltage of LM317 drops when lead acid battery is connected on output

I have built a voltage regular circuit with LM317. Its input is connected to my solar panel. As in many circuit examples, there is a voltage divider to bias the adjust pin. Also, I have connected a ...
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2answers
195 views

Can I use LIPO battery voltage checker for 12V lead acid battery? [closed]

Can I use the LIPO battery voltage checker to monitor voltage of my 12V 7Ah lead acid sealed battery? Currently I use a multimeter to check the battery voltage frequently as I am experimenting with ...
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0answers
166 views

Effect of temperature on CC, CV, Float, Gaseous voltage of agm vrla battery

What are the temperature compensated values of Constant voltage, Constant current, Float voltage and Gassing Voltage for AGM VRLA batteries? What is the raise on each of the above parameters of AGM ...
5
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1answer
585 views

How good is the advice to run the car headlights before starting the car in cold weather?

I'll do my best to formulate this as a purely electrical problem so that it isn't claimed to be belonging to Vehicle Maintenance SE. We have a lead-acid starter battery (not a deep cycle fashion) ...
4
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3answers
670 views

What is the most efficient way to power a solar computer (5V) from a 12V lead acid battery?

My project: Power a Beaglebone Black (BBB) entirely from solar energy. Obviously energy efficiency is crucial here. My setup so far: PV panel connected to a deep-cycle lead acid battery. Now I need to ...
1
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1answer
171 views

What kind of capacitor should I use in Buck topology if the load is a lead-acid battery?

I'm using BQ2031 to charge lead-acid batteries. BQ2031 takes battery voltage as feed back and controls the switching element according to it. Now the load is not a passive element, instead it is a ...
4
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2answers
2k views

Can the terminal voltage of a lead acid battery be reversed?

I recently acquired a used riding mower. I figured it was dead, so hooked it up to a trickle charge overnight. Next morning, still totally dead. I stuck my voltmeter on it, and measured -11.8V. Check ...
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2answers
389 views

Stopping criterion of lead-acid battery charging operation with SMPS

I'm trying to charge a lead-acid battery. The input DC voltage is too high, so I used a 400W SMPS to drop it down to a more convenient (currently not decided) voltage level. Battery capacity is not ...
2
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1answer
116 views

Is it okay to charge a VRLA with a AGM charger?

I have a 1000mA charger meant for a 10Ah, AGM SLA battery. I picked up a VRLA, which is 17Ah and I am wondering if the charger is OK for it. When I tried to charge it, the green light never came on, ...
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3answers
1k views

Decrease a voltage from 24-27VDC into 18VDC using a 7812 and a bunch of other home supply parts

I have one 7812 1A linear regulator, bunch of resistors and zeners at home. My input voltage is 27VDC from two 12V lead batteries. Desired output voltage is 18V and the maximum current consumption of ...