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57 votes
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Can this battery be charged?

It's a lead acid battery. The second bullet point wraps to the third line (terrible layout). Do not charge in a gas-tight container In other words, you can charge it, just ensure that it can ...
JYelton's user avatar
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19 votes
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Can lead-acid batteries be stored by removing the liquid from them?

NO! First, the theory: Dry-charged batteries are not prepared by flooding them, charging and draining them afterwards. Instead, the plates are press-formed with the approximately proper chemical ...
fraxinus's user avatar
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14 votes
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Lead Acid AGM battery testing - Why am I testing it this way?

You could do the entire discharge at the lower rate but then it would take a lot more time. When discharging at a high rate the voltage may collapse prematurely so the battery seems discharged before ...
Kevin White's user avatar
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14 votes

Can lead-acid batteries be stored by removing the liquid from them?

Yes, this is possible. In fact we had deliveries of hundreds of dry-charged batteries and separate deliveries of the acid / liquid to fill them with. Guess who, as an apprentice, got to mix the acid ...
Solar Mike's user avatar
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13 votes
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Can you monitor the state of charge of lead-acid batteries through their terminal voltage if they're being used?

Partially. But you will also need to monitor the current. While there are many algorithms for SoC (State of Charge) estimation, the classic one uses two components: voltage translation and Coulomb ...
Davide Andrea's user avatar
13 votes

Can lead-acid batteries be stored by removing the liquid from them?

A friend of mine told me its better to drain the batteries off the liquid that it contains and store the liquid separately and then when the time comes to reuse the battery to fill the liquid back ...
Rohat Kılıç's user avatar
11 votes
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How much current can lead acid batteries safely supply?

Lead acid batteries are fantastic at providing a lot of power for a short period of time. In the automotive world, this is referred to as Cold Cranking Amps. From GNB Systems FAQ page (found via a ...
manassehkatz-Moving 2 Codidact's user avatar
11 votes
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12 V lead acid charger with LM317 not charging

Read the datasheet of the LM317, on page 9 it states: So when you feed the LM317 14 V it can regulate to 11 V and lower, not 13.5 V. Also there will be 1.25 V across R1 so for 13.5 V you will need ...
Bimpelrekkie's user avatar
10 votes
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Lead acid battery boiling during charging: this is bad, right?

Yes it is normal for the water to boil if you are overcharging it, with a too high current. And it is bad. Yes your charging current is set too high. Also check that the final float voltage from your ...
Dejvid_no1's user avatar
  • 3,598
10 votes

Can this battery be charged?

As other answers have stated, do not charge in a gas tight container. Since this is Electrical Engineering, might I venture a guess that you have a benchtop power supply with adjustable voltage and ...
MTA's user avatar
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9 votes
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Using capacitor bank in parallel with lead acid battery

Capacitor voltage rating is not how much volts it WILL have when charged. It's how much volts it CAN take before it explodes. If you charge a 16V capacitor from a 12V battery it will charge up to 12V. ...
floppydisk's user avatar
8 votes
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Can lead acid battery be used as a capacitor between power supply and equipment?

Well, sort of, but not really. The power supply would need to be adjusted to put out about 13.7 volts. This is the nominal float voltage for lead-acids, and is the point you should aim for. There ...
WhatRoughBeast's user avatar
8 votes

Jump start car with AGM battery

Probably that battery is not designed for automotive applications. SLA (Sealed Lead Acid) batteries are designed to start car engines, and that requires a peak current that may be several time the C ...
LorenzoDonati4Ukraine-OnStrike's user avatar
8 votes

Lead Acid AGM battery testing - Why am I testing it this way?

A reason to do this would be to get a quicker assessment of the charge capacity at a constant 5A drain. Another may be because that more closely simulated the actual battery drain on the Llama farm ...
TimWescott's user avatar
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8 votes
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Can I use medical injection water to fill lead acid battery?

No, because it contains conductive ions of sodium and chloride. The water you put into batteries is deionized/distilled/purified water to especially remove any conductive ions.
Justme's user avatar
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8 votes

Can lead-acid batteries be stored by removing the liquid from them?

A lot depends on your location. I lost several batteries by using a maintenance charger over the years. Since I was tired of changing batteries I got lazy and disconnect one of the battery leads in ...
Gil's user avatar
  • 5,193
8 votes

Can this battery be charged?

Do Not Charge in a Gas Tight Container --> Reason is lead acid battery will react during the charging & discharging so definitely it will emit some gas so that was they mentioned.
pradeepkumarkandasamy's user avatar
7 votes
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Li-Ion Power Pack vs Deep Cycle 12V Battery?

...hold about the same number of AH But there's the catch! A big one: The mAh rating for the SLA battery is at 12 V so that equates to: 12 V * 22 Ah = 264 Whr (Watt*hour). But for the powerbank it ...
Bimpelrekkie's user avatar
7 votes

How to limit HV capacitor charging current?

How could i modify scheme to get rid of lamp and raise its efficiency to 85-95%? You can't, this circuit needs the lamp to limit the current. Without the lamp too much current will flow and battery ...
Bimpelrekkie's user avatar
7 votes

Why do lead-acid batteries perform better than Li-ion with substantially more ampere hour?

I can see a few issues: The UltraFire batteries shown in your photo (and in your calculations) are fake. It is impossible to have 12,800 mAh capacity 26650 batteries. This is similar to my answer ...
SamGibson's user avatar
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7 votes
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Safe continuous discharge rate of a car battery

Your Varta battery is a Sealed Lead Acid, AGM type. I could not find useful information on Varta's website, so I will refer to other manufacturers that provided data. I tried to find from YUASA brand, ...
EJE's user avatar
  • 1,589
6 votes
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Cut-off circuit for 12V battery

M1/IC1 form the latching 'thyristor type' power switch. It draws no power when off, and little when on. simulate this circuit – Schematic created using CircuitLab The TLV431 (not the right ...
Neil_UK's user avatar
  • 169k
6 votes

UPS for home router

Calculating the needed capacitance is easy for a simple parallel cap: 1 microfarad will supply 1A of current for 1 microsecond while dropping the voltage by 1 volt. 1A is a typical steady-state ...
Dmitry Grigoryev's user avatar
6 votes

What is a safe max. discharge current for a tubular lead-acid battery?

There is no such thing as a "maximum current" for a cell (the way there is for a fuse, for example). If you read that a cell has a "maximum current of 1 A" it doesn't mean that it'...
Davide Andrea's user avatar
5 votes
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Can I Run An Appliance From a 24v Battery?

Just get two car batteries and put them in series. That should be close enough to 24 V to run the device. It is quite unlikely that ±1 V will cause any trouble, although there is no guarantee ...
Olin Lathrop's user avatar
5 votes

Connecting lithium and lead-acid in series

Generally it’s a very bad idea due to different discharge curves for different chemistries plus the increased problems with series connection of any batteries. If you do manage to have floating or ...
winny's user avatar
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5 votes
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What is the lowest voltage a 12V lead-acid battery in a car could be?

Inside a car is a particularly brutal environment. It depends whether you're making a one-off for your own joy, or manufacturing something to sell. There are two specifications, working, and not ...
Neil_UK's user avatar
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5 votes
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Do revived dead batteries become less effective?

This is a major annoyance with "smart" chargers in that they follow certain recommendations and refuse to charge a battery that is too dead. You can probably revive the battery with a bench ...
Spehro Pefhany's user avatar

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