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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46 views

Charging Lead Acid batteries and Li-ion alternatively using the same charger without losing the power

I only have one good charger. I can regulate the voltage, the current, the protections ... The idea is this. Depending on the state of the batteries I'm going to choose to either charge Lead acid or ...
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61 views

What is the right voltage to charge a flooded lead acid at CV? Also it got pretty warm while filling up acid

Recently purchased a Yuasa PowerSport (6N5.5-1D- 6V 5.5Ah) bike battery. Since Amazon does not sell it with the acid it has to be purchased separately from an auto store or self prepared. I went with ...
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19k views

What can be the consequences of charging a lead-acid battery with an excessive voltage?

In my field-operating device I use a simple PWM step-down to charge a 6V 3.9Ah lead-acid battery from a 5W solar cell with a voltage of 7.2V. Unfortunately the DC regulator got damaged today and the ...
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74 views

Old lead-acid battery inrush charging current

Can an old lead-acid battery have an usually high inrush charging current, such that the alternator belt squeals for the first 30-90 seconds after the engine is started? It is worse in hot weather. ...
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142 views

Charging lead acid batteries in parallel? [closed]

I recently got my hands on eight 12V 9AH lead acid batteries. Could I simply place them in parallel and charge them with a battery tender without any special measures? Are there any risks involved? ...
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165 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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1answer
245 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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242 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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397 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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51 views

Do revived dead batteries become less effective?

There's a common belief that once a car battery dies, after it gets jump started, it will never be as good as before, and will likely die again. I'm curious whether this is a myth, or if not - what's ...
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43 views

Super simple: Convention for connecting batteries in series to load

Super simple question. I am new to electronics and have to connect 4 12V lead-acid batteries in series. Once I connect the negative terminals of each battery to the positive terminals of the others, ...
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67 views

What is wrong with this battery

I recently encountered a battery that was installed in a vintage lawn mower. The battery was dated 9/19 but would not start the engine, it would not even cause the relay to click. The voltage on the ...
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Charging three lead acid batteries in parallel with a single 14V charger

I need a 36V battery for a project of mine. Eventually I will buy a li-ion pack but now when prototyping and testing I don't want to spend a lot of money so I'm looking at cheap alternatives. I'm ...
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31 views

Lead acid battery and lead acid battery charger — specs don't match, but can I use them anyway?

I have the following: Lead acid battery Specs: 12V, 7.2 Ah Model: Portalac PXL12072 Description: Kind of old, so maybe sulfated, but I won't know until I try to charge it. Lead acid battery ...
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216 views

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

I am trying to run a WiFi router from a 12V lead acid UPS battery. To get a stable 12V output from the battery I used an LM2596. The problem is that the output is always 8.28V-8.50V. No matter how ...
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519 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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65 views

Charging a big battery with small solar panels very very slowly

I have a 6V, .7amp solar panel that typically puts out 2-5V under normal conditions. I would like to charge a 12V 5 amp hr lead acid battery over a few days to weeks. The device that I want to ...
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19k 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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111 views

How to check with a simple multimeter whether an old lead-acid battery and its charger are still working?

I have an old (ca. 10 years old) 6V lead-acid battery and a mains charger for it and I know the combination worked years ago. Now I tried to recharge the battery and the charger's LED turns on ...
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3answers
82 views

Robust low battery cutoff

I am building a 5V DC charger for an offroad motorbike. The main goal is to use this to charge/power a mobile device/phone/tablet whilst travelling/camping. If space allows maybe also a GPS tracker ...
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1answer
71 views

Can de-ionized water be used instead of distilled water to prepare lead acid battery electrolyte?

I have a couple of Yuasa and Power Sonic conventional lead-acid bike batteries that I recently purchased for a very good bargain price from a seller. They are new and never used. But unfortunately, ...
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63 views

Why doesn't current fall to zero after unplugging the charger? [closed]

I use an automatic charger to charge my lead acid battery. After the battery is fully charged, it shifts to maintain mode, where the charging current reduces to as low as 13mA. I noticed that even ...
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2k 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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78k views

What should the voltage of a fully charged lead acid battery be?

I don't have a proper lead acid battery charger... But I own a small Yuasa 7Ah battery. I am using a 13volt 1.5A wall wart to charge it. And I have a volt-meter to check the voltage. At what ...
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60 views

Help understanding RV/Marine battery chargers

I am trying to understand how modern 3-stage marine/RV lead-acid battery charge systems work. It's very common to wire a charger in parallel with both the battery bank and the "house" power. This ...
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34 views

Circuit Charging Sealed Lead-Acid Battery (NP1270M)

I have a project (remote gate opener...) I have made good progress but its the first time I have built a charging circuit so I have some questions I need help with. The battery I am using is a sealed ...
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2answers
91 views

What is the Ah to voltage relationship of a 12 V lead acid battery?

I've a DC motor (brushed) that is driven by a set of 12 Ah 12 V lead-acid batteries. When motor stops moving, I assume that all the current (at least most of it) in the batteries is drained. However, ...
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43 views

Do I choose a series or parallel battery set up to power a fish finder?

I plan on running a Garmin UHD 73SV fish finder off two 12V 7A lead acid batteries for a kayak. The unit pulls 1.25Ah. So if I run them in parallel I will have 12v 14A with a run time of about 11.2 ...
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627 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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68 views

Connecting multiple chargers to a lead acid battery

I have a scenario where I want to connect an external battery charger to an alarm system's battery to keep it charged fully despite our country's frequent rolling blackouts. The battery is a larger ...
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1answer
62 views

Choosing a resistor for balancing lead acid batteries

I have a solar-panel-and-battery kit with a built-in inverter and what not built into the battery box. (Goal Zero Yeti 400) The battery box has Anderson Powerpole connectors for chaining it to ...
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58 views

Limit current when charging a battery?

So I am trying to charge a 12V 1.3Ah lead-acid battery(actually they are two 6V batteries in series). Now I have a power supply which says 12V 500mA but actually outputs more like 21V.. No idea why.. ...
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801 views

Many questions about charging a lead acid battery

Well, I have a 12V 9AH SLA Battery, and I use a 7815 + a diode in series to charge it, (I really wanted to build a charger using the L200 or the LM317 but I couldn't find any of those in my city). So, ...
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2k 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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310 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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76 views

On the possibility of lead acid battery recoverability [duplicate]

I have a 6 V 4.5 Ah lead acid battery which I did not charge for the last 6 months. Now the battery voltage fell to 3 volts and then I charged it for 24 hours at 50 mA. Now when I measure the voltage ...
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60 views

Lead-acid battery charger, specific circuit, 3~4.5 Amps, doubts + recommendations

I want to build a lead-acid battery charger which can reach an average charge current of 3 to 4.5A, and start with a prototype. The charger needs to be supplied by the mains, up to 250VAC, for example....
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12k views

Why are Li-Ion battery so much safer than lead-acid?

Recently I asked how to charge a (lead-acid) car battery at home and looks like the answer is very dangerous, don't do it unless you really really have to. Meanwhile people charge Li-Ion batteries of ...
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41 views

Confused about battery rating specifications [duplicate]

I'm confused about how to understand battery capacity by its ratings. I though I understood Amp-Hours, as a nominal rating where they usually specified a period of time where that rating was ...
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1answer
89 views

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

I've been using a 36V motor that draws ~13A current at peak. I initally used a set of three lead-acid (12V 12A) batteries in series to power the motor. They had sufficient power to easily take a ...
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103 views

Can lithium batteries and lead acid batteries be used together? [closed]

If I have the two batteries with same voltage but different capacity, can lithium batteries (the lfp battery like this type) and lead-acid batteries be used together?
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92 views

How does the charging curve of a deep-cycle lead-acid battery change as it degrades?

I am designing a circuit inside a UPS that periodically tests how long the battery can power the load. It does this by breifly disconnecting the power from the UPS and extrapolating from the measured ...
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3answers
657 views

Charging 12V SLA from Single Solar Cell

I'm interested in charging a 12V Sealed Lead-Acid battery from a single monocrystalline solar cell. The solar cell's voltage is only 0.5V at maximum power point, but it supplies 8A. I will need a 32X ...
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82 views

Is there a minimum for charging current for lead acid battery?

I've recently bought a 9 V, 3 W solar panel that I wanted to use to make a small project in my balcony, then I bought a 6 V, 4000 mAh sealed lead acid battery, I want the solar panel to always charge ...
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83 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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107 views

Can Lead Acid and Lipo batteries be connected together to achieve higher resulting current?

I have a lead acid battery setup which has 3x12V 12Ah batteries connected in series resulting in 36V 12Ah output. I also have 3 LIPO batteries (1x11.1V 3300mAh, 1x11.1V 3000mAh and 1x12.6V 4500mAh). ...
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9k views

Can the terminal voltage of a lead acid battery be reversed?

I recently acquired a used riding mower. I figured it was dead, so hooked it up to a trickle charge overnight. Next morning, still totally dead. I stuck my voltmeter on it, and measured -11.8V. Check ...
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3answers
866 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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100 views

Is it possible to fully charge a 12V lead-acid traction battery using a car battery charger?

I got a 45Ah 12V traction battery for my experiments and I was assuming that I can recharge it using a normal car battery charger (the main difference between 12V car starting battery and 12V lead-...
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49k 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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