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.

learn more… | top users | synonyms

-1
votes
1answer
49 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 ...
2
votes
0answers
47 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 efficiency at ...
0
votes
1answer
50 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. ...
0
votes
0answers
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 ...
0
votes
2answers
88 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, ...
-1
votes
2answers
89 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 ...
0
votes
0answers
67 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 ...
2
votes
4answers
120 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 ...
0
votes
0answers
48 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 ...
0
votes
0answers
98 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 ...
0
votes
2answers
98 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 ...
0
votes
1answer
86 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 ...
4
votes
2answers
1k 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 ...
3
votes
1answer
101 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 ...
0
votes
1answer
122 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 ...
0
votes
1answer
63 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 ...
0
votes
0answers
69 views

Plante Lead acid battery formatting/forming process

Is there a description anywhere that explains the physical process for Plante lead acid battery formatting?
0
votes
0answers
93 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 ...
0
votes
1answer
112 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 ...
1
vote
2answers
183 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 ...
0
votes
1answer
83 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 ...
2
votes
2answers
816 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 ...
1
vote
3answers
132 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 ...
1
vote
3answers
138 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?
1
vote
3answers
860 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 ...
6
votes
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 ...
-1
votes
2answers
165 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.
0
votes
2answers
180 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 ...
0
votes
1answer
324 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 ...
1
vote
2answers
173 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 ...
0
votes
0answers
152 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
votes
1answer
537 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
votes
3answers
604 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
vote
1answer
160 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
votes
2answers
1k 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 ...
2
votes
2answers
346 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
votes
1answer
106 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, ...
3
votes
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 ...
3
votes
3answers
367 views

Is there an instrument that can measure the capacity of lead acid batteries

Background I have an electrical scooter with 6 x 12Volt lead acid batteries (72 Volts total), which are now in such a condition that they can barely get me to my work and back. I got a bunch of used ...
1
vote
1answer
623 views

Will a trickle charge lead-acid battery system last?

If I were to implement a simple battery backup system like this to power several WiFi radios in a field situation, how would the battery handle it? Would trickle charging it like that wear it out ...
1
vote
2answers
691 views

Solar cell trickle charging lead-acid without charge controller

Can somebody comment on sizing a solar cell for trickle charging a lead-acid battery bank without a charge controller for several months? I found a non-authoritative source that claimed that cells ...
3
votes
1answer
417 views

How to detect low battery of a lead-acid battery?

I've heard that discharging a lead-acid battery to 0% is bad and wears it out. I have a 10Ah 12v lead-acid battery, is there a circuit to tell me when the battery is low?
4
votes
1answer
399 views

Connector for a certain type of lead-acid battery

I need to connect some lead-acid batteries together, to form a bank. A fair amount of current will be drawn from them. However, I haven't seen the terminals used in those batteries before. What ...
-1
votes
1answer
201 views

Battery Monitoring IC for 24V 480Ahr SLA

I'm building a battery monitoring system for a large automotive application. Is there any IC tuned to measure a Lead-Acid battery pack's voltage, current and state of charge? The closest I got was ...
1
vote
2answers
108 views

Decreasing voltage without decreasing the current

I have got two 12 V 7.2 Ah lead-Acid batteries, which are connected in Series (26 V after charging). The batteries are connected to a step-up / boost module which have to be 2 V higher than the input. ...
-5
votes
1answer
607 views

12v lead acid to 5v USB using Car cigarette converter [closed]

I am trying to power up a Raspberry Pi outdoors. So I got a lead cell battery and a car cigarette lighter to USB converter (12v-to-5v step down converter). Unfortunately, before even connecting the ...
1
vote
0answers
1k views

How does one determine Lead-Acid battery end-of-life?

Have a lead-acid (deep-discharge) battery bank (small bank with only 2 batteries, in series), whose terminal voltage reads 26.5V. My past method of determining the need to change batteries is based on ...
2
votes
0answers
135 views

How to design and build intelligent controller for a power pack made of recycled lead-acid batteries?

I am quite ignorant in electronics, but I am now building a small off-the-grid installation to be freely cloned (CC-BY) in rural areas of Eastern Poland (and perhaps Ukraine). The vital part of it is ...
2
votes
1answer
285 views

How to measure the car battery charge with good precision

My goal is to replace the analog battery gauge in the dashboard - with a more accurate, digital gauge. My first idea was to look for a specialized IC. I'm familiar with battery gauges for LiPo ...
4
votes
2answers
17k views

What should the voltage of a fully charged lead acid battery be?

I don't have a proper lead acid battery charger... But I own a small Yuasa 7Ah battery. I am using a 13volt 1.5A wall wart to charge it. And I have a volt-meter to check the voltage. At what ...