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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122 views

What are the limits to connecting batteries in parallel?

i've been researching components for a solar project and have been struggling to find an answer to this general question: how do you determine how many batteries, or series of batteries (lead acid in ...
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56 views

Battery level on battery indicator drops when i connect a load? [closed]

I've got this cheap battery level indicator that has 4 battery level segments, it is connected to a 12V-18AH lead acid battery that I to charge my laptop and my 1W light bulb. I really can't seem to ...
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290 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 ...
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12k 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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301 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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3k 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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642 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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879 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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151 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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4k 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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810 views

How to Choose a Lead Acid Battery Charger?

It has been suggested that you can charge sealed lead acid batteries with a normal power supply. On the other hand, chargers are available for purchase, but cost almost $100. Is there a reason to go ...
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1k views

Can I use 15V 2A transformer with this circuit?

I m trying to build a charger circuit for a 12V 7Ah Sealed Lead Acid Battery. I found this circuit online and it uses 15V-0-15V 1A Transformer as AC input. Circuit Source I have a 15V-0-15V 2A ...
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2k views

battery chargers - AGM and lithium

I am working on an inverter with a battery charger for a 24V,200AH AGM battery pack. The battery charger current can be adjusted from 10 to 50 amps. Now, I want to be able to also a charge a lithium ...
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345 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-...
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91 views

charge a 12v battery from a cigar lighter

would I be right in thinking that to charge a 12v 7 ah sealed lead acid battery from a cigarette lighter socket on a canal boat, I would need to wire a bulb into the positive lead of the connecting ...
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101 views

charging lead acid cells

And I have forklift battery 24V which is almost at the end of life. The 24V charger is very strong and heat battery and not working properly. I have one 12V battery charger, which works very fine. ...
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495 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, ...
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918 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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66 views

Lead-acid battery Polarity Swap

I’ve seen people ask how to discharge a lead-acid battery, which is easy enough. I have a lead-acid battery that I must have connected to my on-board boat charger backwards. It must have been very ...
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56 views

Charging 4 x 12V lead acid battery with solar in series or parallel?

I have a small electric vehicle that currently uses 4 x 12V 8Ah SLA batteries wired in series as its 48V battery packs. I have 2 of these packs. In order to charge the batteries, I unplug all of them,...
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136 views

Why does my 12V SLA Battery behave strangely when charged by simple LM317 circuit?

I'm currently working on a DIY alarm circuit and I have need of a charge controller for a 12V SLA battery. I picked up a XH-M603 charge controller (https://www.banggood.com/XH-M603-DC-12-24V-Charging-...
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Float charging current for AGM battery?

I have a no-name 2-stage trickle/float charger I bought "surplus" and I'm trying to decide whether to throw it out or not. It trickle charges a 35 Ah AGM battery up to 14.4V at 500 mA, then drops to ...
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Battery Discharging and Effect on Lifespan

I have noticed that some times during the day when my solar system panel is shaded it starts using the battery bank power (a few ampers) for a few seconds and then recharges the battery after the ...
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1answer
92 views

What is 'DOC' in terms for Depth of Discharge for SLA batteries?

I'm trying to understand the spec of a SLA battery. There's a chart which is titled "Cycle Life in Relation to Depth of Discharge": Can I ask what 'DOC' stands for and the chart is read? How come ...
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43 views

Do I need a cut off circuit for my battery

Do I really need an auto cut off circuit for my battery when my charger only outputs 13V and 1A at max. The battery I want to charge is a 12V 7Ah Sealed Lead Acid. I heard that the cut off for lead ...
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106 views

trickle charge backup battery

I would like to know if the schematic below would work to keep a 12V SLA battery at or close to float voltage to be used as a backup battery? R1 will limit the charge current to the battery, but am I ...
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17 views

Using SLA in place of LFP to test an LFP charging device

I'm testing a solar charge controller for LiFePO4 that uses absorption and float stages. By design, power-on initiates the absorption stage, and a timer terminates absorption and initiates the float ...
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2answers
88 views

Sealed lead-acid battery UPS indoor?

I bought a BX700UI APC UPS for my linux arm server setup (40 watts) to protect it from power cut. - I have the server in the bedroom is it dangerous to have such an Ups in a small bedroom? - Thinking ...
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78 views

Slow-start lead-acid charge - good or bad?

I have a 300Ah battery which is near-dead (Abused in the past, around 5 years old) and want to replace it with 4-6 new 100Ah. The current method of charging is with a 30A MPPT solar controller. As ...
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60 views

Switch off branch of a circuit when voltage is present in another branch [power path management]

I want to convert a circuit that runs on 6V DC (from an intermitent power source) to a battery-operated one, by adding a Sealed Lead-Acid (SLA) battery. This would fulfill the following scenarios: ...
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345 views

What is the actual capacity & charging current of a given deep cycle lead acid battery?

Firstly let me say that this is with a view to using a lead acid battery for backup purposes in case of power outage (mains power, a few lightbulbs but with daily outages lasting a few hours) So let'...
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61 views

Is the mobile charger capable of charging an SLA?

The referenced article over on http://www.instructables.com/id/4V-Lead-Acid-Battery-Charger/ indicates a Li Ion charger for mobile phones may serve to charge a low AH SLA. I held the impression a Li ...
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28 views

Does the charge of a battery affect its discharge voltage or current?

Although I am making an electrochemical battery (1 lead acid cell), I thought that this question would be more suitable here. Would there be any difference in the voltage and current of the cell (when ...
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116 views

Why are Nickel Iron batteries expensive, less manufactured and not researched much?

I have read about Nickel-Iron batteries and from what I have understood they have very long life and large cycles. They are heavier than lead-acid batteries, but even lead acid cells are used in ...
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439 views

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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110 views

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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301 views

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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73 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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71 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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140 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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795 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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40 views

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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1answer
199 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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203 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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437 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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524 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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82 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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1answer
188 views

Switching Lead-Acid battery charger

Sorry if this question is a bit broad, or too part-suggestiony. I've been trying to find a good solution for over a month (and three board revisions) now, and I hope someone has an idea I haven't ...
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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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3k views

Charging lead acid batteries using DC-DC Buck Converter

Is there any disadvantage using an 18V 2A transformer with an adjustable DC-DC buck converter(link below) to charge a 12v 7Ah battery ? I know that the charging current must not exceed C/10 (700mA ...