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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66 views

Lead acid battery for embedded system

I am developing an embedded system that contains a 12 V lead-acid battery. The system is developed for 12 V vehicle applications, also using a 12 V lead-acid battery. I am not so sure how to connect ...
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44 views

Is my battery really fully charged? Should I use the “pulse repair” button of my charger? [closed]

I have a 12V lead-acid battery that is detected at 0.8V when I use a multimeter: When I plug my charger it says "fully charged": Should I use the "repair" button of my charger (I ...
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Need help with maximum safe load on a C10 battery in a Solar power system

I have a solar system with 20Amps/12v MPPT, 150ah/12v C10 battery, 500watts/24v panel and 1000va inverter. I have a few questions. Can I use a 750w cloth iron on this for 30 minutes? As per my ...
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44 views

Will my deep cycle battery protect itself from full depletion?

I have a 12 V, 55 Ah lead acid deep cycle battery that I am using to power a small cooler/fridge that will hold medicine for a community project that I'm working on. The goal is to provide continuous ...
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69 views

designing a mains powered car jump starter [closed]

Would it be possible to jumpstart a car using mains power? I'm talking about a device that plugs into a 240V AC mains power outlet, and clamps onto a 12V DC lead acid battery. Here are the main specs ...
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60 views

Would a cracked sealed lead acid battery be a safety issue? [closed]

I know that 'sealed' is a different term but most know SLAs as that. I've had a PowerSonic 12V 7ah in my bedroom for maybe a year, not really doing much (anything actually). I realized that it had a ...
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28 views

VRLA battery in closed container?

I've just started a new "sunday project", the aim of which is to build an ROV. I was wandering if I could use my spare VRLA battery (NEXON XT line 12v/33Ah) as an onboard power supply. Do ...
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51 views

Variable Current Lead Acide Battery Charger

Digitally controlling charge voltage with some regulator like Lm317 is a matter of using some resistor and transistor as stated in lm317 datasheet to select from multiple pre defined voltage. But what ...
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1answer
62 views

Overcharge a sealed 12V lead-silver-calcium battery with a power supply to prevent sulphatation

I read that lead silver calcium battery need 14.8 V to fully charge. The max with my charger (ctek) is AGM setting which is 14.7 Volt. I fear this lower voltage this will lead to sulphatation of the ...
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37 views

PWM and MPPT charge controller on same solar panels

I have two identical solar panels in series that are connected to an MPPT controller (EPEver Tracer 1210A), which is currently charging two SLA batteries connected in parallel meant to power some ...
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42 views

Optimum volt not returning on lead acid battery when load is put on the battery

My Tractor battery (110ah) 12V when I put it on backup check, when the load is put on the battery of discharging 400watt bulb, the battery doesn't reach back to 12v after load, it stays around 11.80 ...
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101 views

Lead-Acid vs Lithium-Ion Rechargeable Batteries

I originally planned to use Lead-Acid rechargeable batteries in a medical device prototype, but it seems that nowadays most devices on the market are using Li-ion rechargeable batteries, which are ...
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93 views

In a 12v automotive system, can a second battery properly sustain charge with a diode?

I am working on a 12v system where there is a display/computer that requires voltage to stay above 8V to stay on. Problem is during engine crank the voltage momentarily drops to 5V before regaining. I ...
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97 views

Connecting lead-acid battery in parallel with lead-calcium battery

So I have a 12 V solar system (panels produce 20 V but batteries are 12 V. I also have a set of 5 batteries. One of these batteries is a marine deep cycle battery and the other is a group of five lead ...
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169 views

LifePO4 battery to replace lead-acid

I want to replace my cargo van's lead-acid battery with a LifePO4 battery. Never used any li-ion type battery for high amp burst. The current lead-acid is NAPA The Legend Premium Battery BCI No. 75 ...
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89 views

Will 14.4 volts from my solar charge controller damage my 12v equipment?

My charge controller is set to recharge my battery bank and begin a float charge at 14.4 volts. If I use some of my 12 volt components during the day while the batteries are charging, will this high ...
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56 views

Using LM393 For SLA Battery Management

I had an old 6V SLA battery laying around, so I thought that it would be a great exercise to design a Battery Management circuit for it. Is the following circuit, based on the LM393, sufficiently good ...
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106 views

Charging Lead Acid battery using SMPS - unexpected voltage measured at battery

I am trying to charge a discharged 12 V Car Lead Acid Battery using a SMPS. According to voltage information provided for charging lead acid battery (https://batteryuniversity.com/learn/article/...
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70 views

Is off grid solar setup limited by battery charging current?

This question is strictly regarding off grid solar power setup, using PV panel, MPPT Charge controller, battery and an inverter to convert DC to AC. Am I limited by the input charging current a lead ...
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90 views

Electric cart circuit, editied [duplicate]

I am trying to make an electric go-kart. I am new to the forum, so I may be missing some information but any help is greatly appreciated. After doing some math and discussing with friends I found the ...
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68 views

MPPT power balance constraints [closed]

I am implementing an MPPT controller with a battery charging controller to charge a lead acid battery. The question has to do with my understanding of how MPPT works. From what I understand is that ...
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1answer
78 views

Lead acid battery charging @ 0.2C

I am charging a 26 Ah battery with a solar charge controller. The battery's manufacturer recommends charging with 0.1C. Which charges the battery at 2.6A during bulk mode. That is what I was going to ...
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794 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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115 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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72 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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63 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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54 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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71 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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31 views

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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45 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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3answers
86 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
93 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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218 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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81 views

Why don't the current readings 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 13 mA. I noticed that even ...
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1answer
65 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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1answer
46 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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110 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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133 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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78 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
116 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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2answers
77 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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1answer
90 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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1answer
145 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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1answer
46 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
98 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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428 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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256 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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1answer
516 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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1answer
126 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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120 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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