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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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Is this method of charging a lead acid battery safe, or even good!

so I need to know if my method/circuit of charging a 6V Lead Acid Battery is safe or even workable! so this is the circuit and battery info! simulate this circuit – Schematic created using ...
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Lead Acid battery dropped to 6V

I left my lead acid battery in my scooter and have not touched it for last 3 months. Now the open circuit voltage is only 6V. Is my battery permanently dead, or is there a way to repair it?
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Powering a 5v raspberry pi, a 12v motor and a 24v motor using 2 batteries charged with a solar panel

I want to control a 250W 24v motor, as well as a 12v 1W motor using a raspberry pi. It needs to all be powered by 2 lead acid batteries which are being charged when not in use. My plan is to use two ...
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71 views

Simple Solar Setup question

I have recently purchased a 10W polycrystalline solar panel with 30A battery clips, a 20A solar charge controller (intelligent regulator with 12V/24V USB display) and a 12V 7Amp lead acid rechargeable ...
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968 views

Long term storage of sealed lead acid battery

I was given some brand new sealed lead acid batteries. I have no real need for them right now, but I don't want them to go to waste. I'm trying to figure out the best way to store them, unloaded, for ...
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7k views

How long (in hours) will a 6 Amps LED light last if powered only by 12V 18Ah Lead Acid Battery only

I have assembled a 300 units of 3650 LED lights which draws a total power of roughly 6 Amps (130Watts) and I want to power it using a 12V 18Ah Lead Acid Battery. My question is, how long or how many ...
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485 views

UPS for home router [duplicate]

Sometimes we have power outages that last about 100 ms that are long enough to discharge capacitors inside router, when that happens we need to wait about 10-15 minutes for DNS, which is pretty ...
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65 views

Estimating current draw from alternator (14.4v?) to 12v DC

I'm wiring my caravan into my car this weekend. In order to keep the caravan's leisure battery charged the cars alternator provides a current to the caravan for this purpose. I need to figure out ...
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341 views

12V Sealed lead acid battery level sensing

I know that you can easily determine the percent capacity remaining in a battery using an arduino by dividing the voltage down to something that the ADC can read. What I'm stuck on is how the voltage ...
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302 views

Charging four 12 V lead acid batteries in series or parallel?

I just installed a 48 V ebike conversion kit on one of my bicycles. I will power it with 4 12 V, 12 Ah, lead acid batteries connected in series because of the cost of 48 V, 12 Ah lithium batteries ...
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1k 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 ...
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243 views

Math Regarding Battery Discharge

Good Day everyone :) I'm new to electronics and it'll be my 2 week practicing it as my hobby though i've done a lot of DIYs and stuffs just by following tutorials but when my friend ask me regarding ...
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188 views

MPPT solar charger for Lead Acid Battery

I've seen plenty of good MPPT (or similar to MPPT) chargers for solar panels, but they all seem to be made for lithium based batteries. Here's an example of what I've seen: https://www.adafruit.com/...
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94 views

Battery Disconnect Switch

I'm an Electrical Engineering student still new to power systems. I'm working on a project that uses a 24V and 200Ah battery bank made up of 4 AGM lead acid batteries. The batteries are supplying four ...
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388 views

What are the compulsory tasks of a charge controller for a lead acid battery?

Solar charge voltage regulators should coordinate the charging process of a battery. Suppose that I would like to design a very basic charging regulator controller with the following specs: The ...
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152 views

Can lead acid battery be used as a capacitor between power supply and equipment?

I have a lead acid battery from an old broken ups. And I have a WIFI router with power adapter. Can I connect the battery directly in the middle between the power adapter and the wifi router like ...
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349 views

Why isn't the final float charge rate = 0 for a fully charged car battery?

I had cause to charge a 12V car battery recently. I used one of these:- To top up an 80Ah lead acid battery. It initially started charging at ~4A. I then left it floating for a couple of days. ...
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Is an in-vehicle, “smart” automobile-battery maintainer powered by a “smaller” rechargeable battery feasible?

Another naive question from a lay-person.    A standard AC utility-powered Tender or Genius type unit is impossible to use with on-street parking. I am doubtful that "solar-powered" units ...
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1k views

GSM SIM900A battery power supply circuit

I want to power GSM SIM900A with Lead acid rechargeable battery 12V, 1.2Ah. The voltage regulator I am using is L7805 which gives a regulated output voltage of 4.9 V. My GSM SIM900A modem is My ...
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25k views

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 ...
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112 views

Does mobile charger and buck converter have any basic difference?

I have a 2 cell(4.2V)/12Ah deep cycle flooded lead acid battery that i usually charge by 5V/2A smartphone charger. By using this charger it takes 200mA current for charging. Today i got my CC/CV buck ...
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633 views

How to protect a 12v lead acid battery from a short circuit?

Is there a board that protects lead acid batteries from a short circuit. The capacity of my battery is 4,7Ah. My circuit is consuming about 3 amps.
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2k views

Revive a dead LED Lantern Sealed Lead Acid Battery [closed]

I recently found my lost LED Lantern after one year in my old garage, but unfortunately it wasn't worked when I turned on. I opened it and checked if the charging circuit was fault, but it wasn't ...
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1k views

Smart Lead Acid Battery Charger Circuit - Is this practical?

I have thought of making a Smart Lead Acid Battery charger using the following schematic. I am not sure, if the circuit would work the way I am expecting it to, or not. My expectations are: The ...
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1answer
837 views

Can I Run An Appliance From a 24v Battery?

First, a little backstory. My wife is planning to operate a booth at some craft fairs and we require power for a piece of equipment (Silhouette Cameo, a computer controlled vinyl cutting machine). We'...
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514 views

Does Amp Hour Rating Take Into Account Voltage Drop Relative to State of Charge?

I'm looking at buying batteries, either 12v AGM or LI-Ion, for use in a backup power system. I have a choice between a Lifeline 8D AGM battery rated at 255 Ah @ 20 hr, or a Victron LI-Ion rated at 160 ...
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1answer
129 views

Charging SLA batteries in series

I'm planning to use 9 or 10 of 12V 7AH (or possibly up to 35 AH) SLA batteries in series to power some LED bulbs. Can I charge these in series, and if so, is it safe to assume that I just multiply ...
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285 views

Why did this Sealed Lead Acid battery blow its vent?

So I plugged in my new nearly full charge SLA battery (12 Ah) into a new charger designed for 12V batteries and within about 30 seconds the bottom blew out a corner, which I assume was the vent, out ...
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543 views

12V lead-acid battery charger with LM317 current limiter

I've got a Vsrc of 14.97 crossing a LM317 current limiter ( 1.25V / 1.25R = 1A), and at the output of the LM317 I have 14.4V/1A. So far so good. Next I use a BC239 NPN transistor to switch a P-...
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1answer
34 views

Hi-voltage required for 100% SoC in LA banks?

Talking large banks of expensive true-deep-cycle cells, not the stuff you see in mass retail channels. Maybe the 6v golf cart batts from Sam's, at the "value" low end. I think end-of-life ratings are ...
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1answer
2k views

What happens if you draw too much current from a 12 volt sealed lead acid battery?

We all know the Michael Bay-esque excitement you get if you misuse lithium-based cells, but I've heard lead acid batteries are a lot more durable. The datasheet for my sealed lead acid battery says it ...
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Are gas bubbles ok in Flooded lead acid battery charging?

I Have HBL power system's 2cell 4.2v lead acid battery which has capacity of 12Ah for C/ 100 and 9Ah for C/10. I found it in the rubbish and thought it may useful and in working condition.I ...
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683 views

Is it ok if lead acid battery charge with too low current?

I have a old dead lead acid battery with two cell and i refine it by adding distilled water. Before adding water battery's nominal voltage is 2.30V and when i connect it to 5V charger which have ...
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469 views

Can i charge fully discharged lead acid battery with little high volatage?

I have a 6v lead acid battery it is fully discharged from 6 months and shows the voltage 5.3 V(3 cell). I have wall power adapter of 12v. When i directly try to charge current reached to 1.8A and ...
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116 views

does 4 amps make a big difference?

i am building a charging station for my lipo batteries for my hobby. i have 2 lead acid batteries, 12v@18ah and another 12v@22ah want to couple these in parallel to bump up the the amps. i have heard ...
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424 views

Can a lead acid battery charger and the battery be used as a UPS?

I want to connect some DC devices(< 1.5 A rating) to the output of a 12V/7Ah battery. Will this system work as a UPS if I connect a battery charger to this battery? i.e the DC devices, Battery ...
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321 views

Lead-Acid battery connections

In a lead-acid battery we have 6 cells, each cell having positive and negative terminal. The negative terminal of the first cell from the right of the picture connected to the positive terminal for ...
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57 views

What current should I charge/discharge my 12V lead battery at?

Here are the specs listed on the battery:
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1answer
144 views

Best 12v battery solution

Beginner with battery tech here, so forgive my naivety :) I'm making a portable bluetooth speaker, and am wondering about the best battery solution to use. The amp needs 60W max, and accepts 12-24V....
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3k views

Lithium Ion and Lead Acid battery in series

I have a 12v trolling motor (55 lb) that is rated for 50 amps. At speed I only pull < 30 amps in my inflatable boat. I know that increasing the voltage will make the prop spin faster, which will ...
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2answers
3k views

Lithium-ion vs SLA batteries for power inverter (1000W)?

What are disadvantages/Advantages of each. Is it possible to replace an SLA battery with a Lithium battery pack of equivalent capacity?
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78 views

What can happen if I try to charge lead acid battery outside charger's capacity range?

I'm looking for lead acid battery charger. My battery (originally from UPS) has 12V and about 40Ah capacity. This is what I see in one charger's datasheet: Automatic charger for sealed lead acid ...
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2answers
199 views

Can a 3 stage charged battery bank be used to quickly charge a drained battery bank?

I am considering this idea. For a 36V golf cart application, I want to be able to quickly charge it (but not to 100% State of Charge (SoC)). The idea is to give the 36V bank a strong boost in ...
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3answers
155 views

How Close do Batteries Need to Be in Voltage for a Parallel Connection?

Ok, so wiring batteries in parallel of different voltage is bad because the batteries try to equalize voltage with high currents essentially by discharging. The thing is, even among batteries of the ...
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1answer
748 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 ...
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4k views

Battery power required for a 2HP Motor AC at 1800 rpm, 56Hz?

So I will be using an Inverter to convert DC(12V) to AC(220v)(50Hz). The 2HP*(746w) = 2.3 kW / .85 power factor = 2.7 kW / 220V = 12.27A If I want it to run for 5 hours that's 62 Ah. Can I use a ...
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1k views

Solar Charge Controller as “UPS”?

I've been trying to figure something out for a while, and have experience with digital systems (logic gates, flip-flops, etc.), but not necessarily "real" systems (with Zener diodes, etc.) so here ...
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13k views

Accidental short circuit of lead acid battery, can I still use it / charge it?

Just a minute ago I accidentally short circuited my lead acid battery. The wiring touched, glowed bright, the plastic around it melted and smoke got released, but I'm not sure from the battery or from ...
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1answer
173 views

Understanding C20 value of lead battery for a low power circuit

I've developed a simple circuit using a Photon to send data to my database. It has to be a portable device and because of this I looked into lead batteries. My circuit runs on 5V and draws a maximum ...
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1answer
926 views

Power a laptop from 12V Battery using DC-DC Step Up Circuit

I have following items 1) DC - DC Step Up Boost (150W) http://www.ebay.in/itm/131625051992 2) 12V 12Ah Battery (Sealed Lead Acid Battery) 3) LCD Lead-acid Battery Capacity Tester I charge my ...