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

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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
84 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
64 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
55 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 ...
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1answer
195 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
301 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
98 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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1answer
155 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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160 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 ...
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0answers
63 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
601 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
190 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
327 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
222 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
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1answer
277 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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294 views

Under what circumstance will damage a lab power supply?

I used a ISO-Tech IPS2303D DC Power Supply to test a solar power charging circuit based on BQ24650. There is a LRC circuit with 10uH inductor on it. Long story short, I use the power supply to ...
4
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1answer
191 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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1answer
139 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 ...
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2answers
98 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
411 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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0answers
569 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 ...
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0answers
107 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
236 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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1answer
7k 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
3k 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
3k 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 ...
4
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2answers
648 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
2k 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
367 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 ...
3
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4answers
527 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 ...
2
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1answer
2k 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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4answers
968 views

Charging lead-acid batteries?

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