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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.

17
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8answers
66k 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 ...
0
votes
1answer
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 ...
0
votes
1answer
28 views

Which AGM battery terminals should be used when wiring 3 or more batteries in parallel?

With a 12V AGM battery bank of 3 or more batteries wired in parallel, is charge able to be drawn by attaching to any random positive and negative terminal across the battery bank? Is it optimal to ...
0
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2answers
58 views

What is the effective equivalent battery capacity between Lithium Ion and Sealed Lead Acid batteries? [on hold]

I was told by a battery salesperson that a Lithium Ion 100Ah battery is equivalent to a 260Ah lead acid battery bank. Is this correct? I understand that lead acid batteries should only be discharged ...
1
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2answers
56 views

ADC conditioning for Lead-Acid monitoring? [duplicate]

I want to monitor a 12V lead-acid battery using an ADS1110 ADC. This ADC has a reference voltage of 2.048V. Thus, I (think) need to condition my input from, say a 10V-15V level range to 2 volts (0.4 ...
0
votes
2answers
23 views

Substitute 12v Lead Acid Battery with Nominal 10.8v Lithium Ion Battery?

I am looking to replace an existing 12v Lead Acid battery configuration (two 7.5Ah batteries in parallel) for an old practice tennis ball machine. The machine consists of 12v dc motors and sensors to ...
0
votes
0answers
36 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 ...
0
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0answers
36 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 ...
-1
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1answer
138 views

Lead acid battery charging current dosent become zero

Here I am charging a 6V 4.5Ah lead acid battery by using a 8V-10V LM317 input supply for the circuit. I'm using the BD139 transistor to cut off and a 6.8V zener diode. As the battery voltage reaches ...
0
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0answers
13 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 ...
0
votes
1answer
168 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'...
0
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2answers
54 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 ...
2
votes
1answer
172 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 ...
0
votes
1answer
45 views

charging 12v lead acid battery with OEM charger [closed]

I have an ExpertPower 12V 7 Amp EXP1270 Rechargeable Lead Acid Battery (link on Amazon here) and would like to safely charge it. Do you think this charger (Battery Tender 021-0123 -- link here) is an ...
1
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1answer
10k views

Charging Lead Acid Battery from dynamo

I want to build a Lead acid battery charger. for that I want to use a small IC engine coupled to a dynamo and the dynamo I got is rated at 12V, 35A and I want to charge 12V 7.5 Ah Lead Acid battery. ...
0
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2answers
4k views

pulse charging lead acid battries effects and side effects

I am developing a solar charger which charges lead acid batteries.I would like to clear a few of doubts on this issue. I am using IR2110 gate driver for driving 2 n-channel mosfets in an half bridge ...
0
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2answers
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 ...
11
votes
2answers
1k views

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 ...
0
votes
1answer
125 views

Mixing Lead acid and Lithium ion in series, after charging them separately

Can I connect a Lithium ion battery battery pack with a Lead acid battery bank; in series. I will charge both separately cells strings separately (not to mix the chemistries) before putting them in ...
0
votes
1answer
24 views

Designing an effective extensible solar cell + car battery setup [closed]

I've got a cabin that I visit on weekends and because I need to charge my computer and tools there, I decided to bring an old car battery and bought a solar panel to charge it. Right now I use a cheap ...
28
votes
5answers
4k views

Charging lead-acid batteries?

Are there any special requirements for charging lead-acid batteries?
3
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0answers
94 views

Parallel connection of old and new gel batteries

I have a battery system shown in the picture, 6 parallel branches of 4 batteries connected in series. The first 3 consist of old batteries which are 2 years old, the fourth branch consists of 1.5 ...
6
votes
3answers
1k views

To pulse or not to pulse

It is accepted practice to maintain lead acid batteries at a float voltage of roughly 2.3 Volts per cell. The precise value depends on battery type and battery chemistry and ambient temperature. We ...
2
votes
3answers
449 views

Car battery (lead acid) discharges much, much faster than it charges?

Let's assume a lead acid car battery (12V, 50Ah, 250A output). According to BatteryUniversity article BU-403: The charge time is 12–16 hours and up to 36–48 hours for large stationary batteries. ...
11
votes
2answers
51k 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 ...
1
vote
2answers
73 views

Charging a lead acid battery with a lower bulk voltage

Will a lead-acid battery completely charge when using a bulk voltage below the one indicated on the specs sheets for it, even if it takes longer? In my case the battery is in a place with temperature ...
0
votes
2answers
93 views

Is my 12v lead acid battery 100% dead?

so I got a ups with a 12v lead acid battery that was constantly on so the water inside the cells has disappeared, initially the reading voltage was 0.3v, and when I added distilled water it generally ...
1
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4answers
5k views

Charging lead acid battery using boost/buck converter

I plan on permanently connecting a 12v lead acid battery to my home made wind turbine (dc). I already have a dc-dc buck/boost converter so I wonder if i can use that to charge the battery. ...
0
votes
2answers
175 views

How to limit HV capacitor charging current?

I have a voltage doubler, which is connected to mains (without galvanic isolation): It enticed me with its simplicity, configurability and option between charging speed or desulfatability. The ...
0
votes
1answer
90 views

Using li-ion battery in place of a lead acid one in a desk lamp [closed]

I have a rechargeable desk led lamp with USB power input. Although it's supposed to hold charge, it only works when plugged. I opened it and found that the problem is about included lead acid ...
0
votes
1answer
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 ...
0
votes
1answer
151 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 ...
0
votes
1answer
117 views

How much input voltage is required to get 12v from LM2596?

I am trying to run WiFi router from a 12v lead acid ups battery. To get a stable 12v output from the battery I used LM2596. Problem is output is always 8.28v-8.50v. No matter how many times I spin ...
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1answer
134 views

Why do lead-acid batteries only last for a few years? [closed]

Why do lead-acid (automotive-style) batteries typically only last for a few years of regular use (or x amount of cycles) before having problems? Obviously, things can't last forever. But, what are ...
-4
votes
1answer
141 views

refilling 4v lead acid battery

in my case i have some 4v lead acid battery laying around.... and i have not used for a while so obviously they are dead or dried out.... i tried to search some way or result on how to refill it... ...
0
votes
1answer
75 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 ...
2
votes
1answer
11k views

What is the charge-discharge watt hour (Wh) efficiency for lead acid batteries at different SoC and charge current 10-35A/100Ah C10?

There is a 1996 Sandia study with the title "A study of lead-acid battery efficiency near top-of-charge and the impact on PV system design" for charge and discharge lead-acid battery amp hour [Ah] ...
1
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1answer
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 ...
1
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2answers
94 views

Advantages of chaining another battery to 130Ah AGM deep cycle 12V battery

I have a 130Ah AGM deep cycle 12V battery for camping connected to 2 x 100W solar panels. I have been testing the system out to see whether it will sustain what I require. I think I’ll require around ...
0
votes
1answer
45 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: ...
-1
votes
2answers
87 views

Question about lead acid batteries? [duplicate]

I am having two batteries of different specs (both, dry cell, UPS/inverter batteries) Battery A: 12 V, 26 Ah Battery B: 12 V, 7.2 Ah I need a 24 V output so I have connected them in series. My ...
0
votes
2answers
340 views

Li-Ion Power Pack vs Deep Cycle 12V Battery?

I've seen a number of videos on YouTube where people have built a "Power Box" by putting a 12V deep cycle battery in some kind of weatherproof box with a charging equipment and added various switches ...
-1
votes
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?
0
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1answer
73 views

Least sub-optimal configuration of flooded lead-acid cells with different capacities

I am aware it's best to use cells of the same capacity, same age, etc. However, until I can replace the cells I have I need to make use of these. The batteries I have are 2V flooded lead-acid cells, ...
0
votes
0answers
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 ...
2
votes
1answer
156 views

Charging lead-acid battery in parallel with load - what if the system voltage goes above nominal, and how to prevent it?

I have just purchased a 6V, 4.5Ah sealed lead-acid to power my arduino-controlled bicycle LED lighting system. The battery is to be charged by the variable power provided by a hub generator, which ...
1
vote
1answer
72 views

DC Motor Theory and Practice

My first post here, I have been playing with a DC motor and attempting to upgrade the original batteries from SLA to Lipo, the scenario is as below and i'm looking for some advice on what happened and ...
-2
votes
2answers
507 views

Connecting lithium and lead-acid in series

I have a 48v 12Ah lithium battery pack, and I want to connect one or two lead-acid batteries of 12v 12Ah to it to make it 60v or 72v 12Ah. I can charge it with a 60v or 72v lithium charger. Will this ...
0
votes
2answers
68 views

How to find out power capacity of an automotive lead acid battery?

I have a few 12V lead acid batteries in good condition which I would like to use to power a surveillance camcoder on a remote site. Ultimately that will be solar-powered, but in the meantime I would ...
0
votes
3answers
2k views

Jump start car with AGM battery

I jump started a car with an AGM battery and later discovered that the 30A fuse connected to its positive terminal had blown. I suspect that this occurred while performing the jump start. How many ...