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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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27
votes
5answers
4k views

Charging lead-acid batteries?

Are there any special requirements for charging lead-acid batteries?
1
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1answer
2k views

Cut-off circuit for 12V battery

I have a simple arduino driven charger for solar energy to pass into 12V lead-acid battery. However, to use the stored energy I need an analog circuit to cut off discharge at 11.5V. I think a voltage ...
20
votes
8answers
78k views

How bad is it to undervoltage a 12-volt lead-acid battery?

I had a heated discussion with a few colleagues today revolving around how low of a voltage was alright for 12 volt lead-acid battery; they were in the opinion that the low voltage warning buzzer and ...
2
votes
2answers
828 views

Is this a viable mini wind turbine setup?

I'm going to build my first wind turbine. I have already constructed the prop, 5 blades 50cm long from PVC pipes. I've searched for a decent sized motor and charge controller. The turbine will be ...
11
votes
3answers
57k 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 ...
9
votes
6answers
8k 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 ...
6
votes
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 ...
10
votes
2answers
26k 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
votes
1answer
911 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?
2
votes
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
votes
4answers
14k 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
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 ...
0
votes
1answer
338 views

Lead Acid Battery Charge C/20Ah

I need to charge a lead acid battery, I will be manually developing a program to set the current. Its the "US 12V XC2" Deep Cycle battery. Here is a link to the datasheet: http://usbattery.com/wp-...
0
votes
1answer
278 views

Designing a battery capacity monitoring system for AGM lead acid battery

I would like to design a battery capacity system for my AGM lead acid battery (12v, 40Ah). My idea is that I have values of the battery voltage and its corresponding capacity, which I will use to plot ...
2
votes
1answer
840 views

Lead Acid Battery charging from laptop psu

I working on a new project of running couple of low power devices from PicoUPS 120 ATV: The review by this guy: Building a 12V DC UPS Is this correct, this does not regulate the output voltage, the ...
2
votes
1answer
2k views

How to attain a topping charge for a lead-acid battery?

Charging a lead-acid battery involves three stages: CC, CV, and Float. I have a charge controller which charges my battery at CC to the float voltage. I would like to add a device that would charge ...
1
vote
4answers
4k views

How to check what is the percentage of charge in my lead acid battery?

http://www.allbatteries.co.uk/media/pdf/AMP92108_FR.pdf I want to know how much percentage of the battery charge is left without buying any fancy equipment to measure it.
0
votes
2answers
493 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, ...