Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [lead-acid]

A very common chemistry system (lead and sulfuric acid) used in rechargeable batteries with a nominal cell voltage of 2.1 V. These batteries are used in automotive and robotics environments.

Recommended reading
BU-214: Summary Table of Lead-based Batteries on Battery University

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Charging lead-acid batteries?

Are there any special requirements for charging lead-acid batteries?
littlebirdceo
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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 ultimate automatic shutoff was annoying and a…
MikeFoxtrot
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Can lead-acid batteries be stored by removing the liquid from them?

I have two lead-acid batteries of the plate type, 12 V/100 Ah each, used for an inverter. I want to store these batteries for a year or two in a disconnected state. A friend of mine told me it's better to drain the batteries of the liquid they…
Anchovy
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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 pump can run, as it only will need to run for about 5…
sbrattla
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How much current can lead acid batteries safely supply?

I have a motor I wish to drive with an 18V lead acid battery. The motor can draw quite a lot of current when stalling and I am worried of overdischarging the lead acid battery. Unlike LiPo batteries with have a maximum current rating, the lead acid…
Chien Hao Tan
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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. What about the "float" portion of the charge? I…
Majenko
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Lead Acid AGM battery testing - Why am I testing it this way?

OK, so maybe it's not fair asking YOU why WE test something the way we do. ;) Here's the thing -- Our company uses AGM Lead acid batteries in some products. The testing methods are ancient (but so is lead-acid technology). There's nobody left in…
Kyle B
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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 voltage should I take the battery off the charger?
Sponge Bob
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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 $50 for a charger. Even if I did I need to…
Sponge Bob
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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 above a certain size. Why is there this…
Mads Skjern
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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 laptops and power tools in-house every day. Those…
sharptooth
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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 batteries are cheaper, but have much worse energy…
sharptooth
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Are sealed lead-acid batteries safe to use indoors?

I have a small, 12V sealed lead-acid battery. I know regular lead-acid batteries can be dangerous to use or charge indoors, due to the fumes they release and the potential for acid to leak out or spill. A sealed lead-acid battery wont release fumes…
user125355
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What is a "charge cycle" of a lead-acid battery?

I'm trying to develop an algorithm that would roughly estimate the health of a lead-acid battery tied to an inverter backup system. It seems that my 200 Ah battery pack stays at 100% state of charge (SoC) most of the time. And when there is a short…
Davcroo
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Lead acid battery boiling during charging: this is bad, right?

I'm an electrical engineer who could use some help understanding lead acid batteries. I recently bought an old motorcycle and charged the battery on my trusty automotive style battery charger after it lost charge. After several hours, the water was…
Fuffer
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