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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CSB batteries Constant Current Discharge Characteristics
I'm comparing batteries for use in UPSes and during my tests I was consulting the datasheets of 2 manufacturers. The datasheet from SunLight is crystal clear but CSB's datasheet is using terminology ...
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31 views
Charger current larger than SLA battery initial current
My Chinese 12V charger is rate at 13.8V and 2A.
The battery to charge is a maintenance free SLA with 1.68A initial current, 13.8V max standby use voltage and 15V max cycle use voltage.
What will be ...
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8 views
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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2answers
121 views
Reserve Capacity Testing On Lead-Acid Car Battery
All car batteries have Reserve Capacity ratings instead of Ah ratings for deep-cycle batteries. Using this data to test the health of the car battery a good way to estimate life left?
Let say I have ...
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1answer
42 views
Voltage drop on batteries when connected to ups/inverter
I have recently installed a solar system and trying to understand the voltages of batteries when they are being charged and when they are providing power to load.
Here is what I observed:
I have 2 ...
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1answer
44 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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1answer
36 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 ...
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2answers
83 views
What is the effective equivalent battery capacity between Lithium Ion and Sealed Lead Acid batteries? [closed]
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 ...
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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 ...
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2answers
39 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 ...
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38 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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44 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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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
62 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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1answer
50 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 ...
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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 ...
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1answer
339 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 ...
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1answer
26 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 ...
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0answers
134 views
Parallel connection of old and new gel batteries [closed]
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-...
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3answers
460 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. ...
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2answers
96 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 ...
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2answers
98 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 ...
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2answers
209 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 ...
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1answer
95 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 ...
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1answer
148 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 ...
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1answer
127 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 ...
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1answer
181 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... ...
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1answer
76 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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1answer
49 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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2answers
88 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 ...
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2answers
492 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 ...
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1answer
75 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, ...
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1answer
209 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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1answer
211 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 ...
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1answer
76 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 ...
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2answers
728 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 ...
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2answers
72 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 ...
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3answers
3k 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 ...
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1answer
672 views
Lead acid battery internal short [closed]
In trying to revive an old lead acid battery I have drained the acid solution from the battery and am attempting to clean the plates with an Epsom salt solution however once drained there seems to be ...
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0answers
257 views
Help needed with over discharge circuit on LifePo4 12V car battery replacement
I'm putting together a LifePo4 battery pack with the intention of replacing the 12V lead acid battery in my 4WD.
So far, what I've got is the following.
4 x 10 Ah LifePo4 batteries (38120 Headway) in ...
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1answer
87 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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1answer
43 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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1answer
421 views
I'm charging an SLA battery and it just keeps taking amps what's going on? [closed]
I found a Razor electric dirt bike and figured I'd see if I could fix it.
Batteries were dead and the "control board" was dead too. It's an on and off throttle so really a relay is all that is ...
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1answer
229 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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1answer
27 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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1answer
366 views
What is the best metal to use for lead acid battery cables?
I purchased an AGM lead acid deep cycle battery, inverter and solar panels. All of the provided cables connecting these devices were made of thick copper.
I also have Goal Zero Yeti 400 lead acid ...
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2answers
6k views
Below which voltage should an AGM deep cycle battery cease to supply charge to devices
I am using an AGM deep cycle battery 130Ah 12V connected to 200W solar panels and a 500W inverter to power electrical devices such as fans, laptops and lamps. The inverter has an automatic cutoff ...
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2answers
99 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 ...
