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Questions tagged [lead-acid]

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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1k 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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2answers
2k 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
335 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 (BBB) running Linux. It is also supplied via this battery. The battery also ...
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2answers
51k 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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4answers
12k 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
1k 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
702 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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1answer
495 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
592 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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2answers
290 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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4answers
13k 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
859 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
4k 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
8k 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). It directly supports charging ...
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6answers
7k 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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2answers
629 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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2answers
374 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
871 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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1answer
2k 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) ...
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3answers
3k 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 ...
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1answer
402 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 ...
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2answers
7k 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
1k 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
256 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
6k 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 ...
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3answers
3k 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 ...
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1answer
3k 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 ...
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2answers
3k 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 ...
4
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1answer
846 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?
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1answer
2k 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 ...
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2answers
190 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. ...
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1answer
1k 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 ...
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2answers
3k views

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

I have a deep discharge small lead-acid battery bank comprising only 2 batteries in series, whose terminal voltage reads 26.5V. My past method of determining the need to change ...
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1answer
250 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 ...
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1answer
426 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 ...
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3answers
69k 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 ...
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1answer
19k views

What's the max discharge (in “C”) of a Pb-acid and LiFePO4 (lithium iron phosphate)?

I know that lead acid batteries can handle massive loads, and they are even used to power houses with solar panels, but what is the maximum safe discharge for one of these? I've done some Googling ...
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2answers
25k views

Can I charge a 12v sealed lead acid with an old wall-wart (not made for charging)?

Will it hurt the battery? If I left it overnight would I run the risk of "exploding" the battery? I have a 7Ah SLA battery that I need to charge, but I don't have a charger and I don't want rake out ...
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3answers
4k views

Are sealed lead acid batteries water-resistant?

I am going on a climbing trip in the Canadian Rockies for 20 days starting this weekend. I am bringing a 12volt 7Ah SLA battery that I am going to use to charge my GPS, iPod, Camera, and Sat Phone. ...
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2answers
10k views

Why are Li-Ion battery so much safer than lead-acid?

Recently I asked how to charge a (lead-acid) car battery at home and looks like the answer is very dangerous, don't do it unless you really really have to. Meanwhile people charge Li-Ion batteries of ...
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2answers
2k views

Maximum operating temperatures of different lead acid batteries

What are the (generally) safe maximum operating temperatures of various lead acid batteries such as wet cells, sealed lead acid, glass mat? I'm looking for a battery that can withstand around 60 ...
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5answers
2k views

A Battery Charger which can extend LEAD ACID Battery life

I am making a battery charger for a 45AH LEAD Acid Car Battery. That I will use with 100 W (1 A 100 V AC) UPS. I need to know that what things I should keep in mind so that the battery charger ...
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7answers
13k views

Why are lead-acid batteries preferable for submarines?

According to Wikipedia article lead-acid batteries are used for running submarines propulsion engines. Submarines are used by the military and the military can afford very expensive toys. Lead-acid ...
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2answers
13k views

Floating multiple sealed lead acid batteries in parallel

I know with multiple lead-acid batteries you should really charge them separately so that one battery doesn't try and charge another and waste power. But that holds true for the main charging process....
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5answers
4k views

Charging lead-acid batteries?

Are there any special requirements for charging lead-acid batteries?