Questions tagged [batteries]

An electric battery is a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy.

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How does this charge controller work? [closed]

I just bought this PWM charge controller (https://www.bimblesolar.com/offgrid/chargers/5a-pwm-waterproof-v2) to go with my solar panel as I was planning to use it to charge some batteries. I have a ...
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Battery Charger - Design of Circuit

Im Designing a Lead-Acid Battery charger, dont't needed that this charger it's the most sophisticated one. As you can see in the attached image, It only consist of a power transformer, a ...
samuel mattio's user avatar
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How do I calculate or estimate how long a battery operated circuit will power an audio exciter?

I understand that this question has a lot of moving parts to it and I am quite a noob. I have a battery operated circuit which in turn powers a planar audio exciter (such as this one: https://www....
RedSash's user avatar
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How is power taken drawn from a home battery/inverter in preference to mains/grid power [closed]

I have a home battery energy storage system with some solar panels, the solar panels don't provide enough energy for me to be completely off grid (especially as I'm in the UK where the weather is ...
Bryan's user avatar
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Can we charge a 12S LiPO battery through a DC safety switch?

I'm working on a robot that uses a 12S battery as its main power source. The problem is that wanted to add a short circuit protection and an overcurrent protection, so added a DC automatic safety ...
Mito's user avatar
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design of a 12v dc hot plate using a solar powered battery [closed]

What are the components(material) needed and what factors can someone consider when designing it?
REMIGIOUS's user avatar
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21700 Lithium Ion Cell Battery Packs [closed]

I'm struggling to find commercial (not custom), certified (UN, UL), low-profile 21700 lithium ion cell battery packs. Are they elusive or non-existent?
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21700 Lithium Ion Cell Battery Packs : Commercial, Off-The-Shelf, Direct Purchase [closed]

Background I am attempting to design a 3Sx2P or 2Sx3P cell-array of lithium ion 21700 high-capacity (3.7 [V.nom], 5[Ah], ≤10 [A.nom]) cells to embed in a low-profile portable electronics system. (I ...
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I am asking that Can anyone tell me which mosfets to use for for charging Circuits using bq24133rgyt , also explain the working if possible , also I [closed]

Can anyone explain me the charging circuit using ic bq24133rgyt, and also provide with mosfets datasheets used in that circuit, `
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Battery Bank Replacement [closed]

I have an old power bank with swollen battery with the specs you can see in image 1 This is the module, but I can't find any specs nor schematics on the internet. The image below will show the full ...
Johan Darmawan's user avatar
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Making a flashlight watch

My son has a rare genetic disorder (nyctalopia) in which the rods in his eyes don't work and so he can't see anything in dim light. I've seen him very confused and scared in environments where I can ...
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Best battery type for outdoor equipment

As per the title, I'm looking for a battery that can be left outdoors (in an enclosure) and withstand a wide range of temperatures, from around -5 to 40/45 °C. It will be kept under charge constantly ...
Meika's user avatar
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Isolated two battery load/charging system (parallel 18650)

I am working on a project and wanted it to be very robust and user-friendly. To power said device, I had planned on using two 18650 in series (li-ion), like everyone else. The problem I had was that ...
Prototype_Zero's user avatar
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1 answer
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Using a potentiometer to adjust a capacitor voltage

Update: The purpose of the circuit is to cause a capacitor's voltage to be set to the voltage on the wiper of a potentiometer that is connected from battery to ground. I.e. when the potentiometer is ...
Mbadugha Chimuanya's user avatar
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Battery (Charge-/Discharge) Efficiency Curve

I’m working on an university assignment at the moment and can't figure out how to do derive the efficiency curve of my battery. I have a fully functional battery model (on current/voltage level) on ...
Bernardo's user avatar
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Mainboard heated/reballed components - mobile phone [closed]

I recently attempted a DIY repair on my Samsung A51. I heated the motherboard in an oven, suspecting that the solder joints on the board might have been disconnected. Additionally, I replaced the PCB ...
user2387843's user avatar
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In a DC circuit with a battery and a capacitor how do electrons on the capacitor plate connected to positve terminal flow?

In a DC circuit with a battery and a capacitor how do electrons on the capacitor plate connected to positive terminal flow? It seems the voltage between them and the positive terminal of the battery ...
Ragtaglm's user avatar
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1 answer
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NTC wire in a replacement LI-ion battery has a different color [closed]

I am replacing a battery pack in a speaker. It is a Li-ion 18650 2600 mAh 7.4 V. I got a replacement from a shop in China claiming to be local. The replacement has an NTC and three wires just as the ...
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Why does loading a circuit cause voltage drop in DVOM?

So this question relates to cars but applies to all electronic circuits really. I was watching a car diagnostic video on youtube and in the video he demonstrates the difference between doing voltage ...
Aden's user avatar
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Why don't oppositely charged ends of separate batteries and capacitors produce current flow? [duplicate]

I have a question here regarding the flow of current from charges. I understand if you connect a simple circuit to a battery it creates surface charges which allow the current to flow. My questions ...
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Does "Torque control" using FOC consider input (battery) voltage drop?

All information related to Torque Control using FOC technique consider a current control, so they suppose a correlation between req_Id (Id desired) and requested mechanical torque. PI regulators ...
Álvaro César Satué Crespo's user avatar
19 votes
3 answers
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Can this battery be charged?

I have a battery that looks like a lead acid battery, contains lead, and it's from one of those little electric cars that kids can ride on, so it should be chargeable, but it says on the casing not to ...
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Drone power distribution board for multiple battery setup

I'd like to add multiple Li-po batteries to my octocopter without worrying about different voltages across different batteries while also allowing regenerative braking. I have seen designs where ...
KWang's user avatar
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How is a DC battery’s voltage distributed across the components in an ideal wire?

If the sum of voltage drops in a circuit is equal to the battery's voltage, then how do the electrons maintain their flow after passing the voltage-dropping components if the components had already ...
Ragtaglm's user avatar
1 vote
1 answer
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Two 14S Lithium-Ion batteries have different charging speeds: the smallest is slower than the higher capacity one

Long story short: I built one 14S battery last year, using Molicell P42A cells. 6 cells in parallel for every series. So, around 58.8V total voltage on the battery. Recently I made another battery ...
justanaverageuser's user avatar
1 vote
1 answer
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Best approach to switch high-power charging port

I have a robot with a high-capacity 24V Lithium Ion battery, that is going to be charged with a 70A charger. The robot is supposed to be able to toggle charging on/off through an input signal. ...
Nicklas Lyck's user avatar
2 votes
2 answers
83 views

Which specific type of P-MOSFET is suitable for Reverse Polarity protection for 18650 li-ion battery circuit?

I'd like to make a reverse polarity protection circuit for 18650 3,7V Li-ion battery (like here: Can I use a p channel mosfet as reverse polarity protection but still charge a Li-Ion battery?) I only ...
iotdeveloper's user avatar
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3.7 V Li-ion rechargeable battery

I have a rechargeable flashlight that uses 3 Li-ion 3.7 V batteries. This flashlight works great the light is extremely bright and adjustable. It's one of those flashlights that plug right into the ...
seejake's user avatar
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Charging a super cap with a Li-po battery while maintaining charge

I have a 3 V 100 F capacitor and 400 mAh 35 C battery, the battery is to be charging the super capacitor and maintaining charge until a button is pressed to discharge the super cap. I am stuck with ...
roaibrain's user avatar
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Design a 12 V battery pack for portable electronics project [closed]

I am doing some electronic project for a portable escape room business that I am running with my wife, the project are basically running or Arduino to take some inputs and switch on a 12 V solenoid ...
AHMAD Q ALBASRI's user avatar
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BJT voltage rail

I have run into some misunderstandings regarding voltage rails in circuits with components such as BJTs. And not the BJTs, but rather the conventional current model schematic made, and the real thing, ...
David Ab's user avatar
3 votes
1 answer
52 views

Protecting parallel 18650 cells

My son is doing an Eagle project where he is creating a solar charged LED light set up using two 18650 cells in parallel. We are working to ensure they are safely protected. From the research we have ...
Shy Dinosaur Productions's user avatar
2 votes
3 answers
113 views

Powering a 3 V motor with 2xAA batteries for several hours

I have a 3 V toy motor that I want to run with some kind of stability using 2x AA batteries. In terms of load, imagine a little fan. I'm not sure how much torque that would add. The motor is a brushed ...
rcot's user avatar
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Regulating 4 AA batteries to 5V over the discharge cycle of the batteries?

Over the discharge lifetime of these batteries the voltage might range from 6V down to 4V. If the batteries were consistently over/under 5V, I could use a step up/step down converter such as a MCP1640/...
Mark Harrison's user avatar
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DIY motor project - Help needed for configuring Maytech 6374 motor

I have very elementary electrical knowledge. I need help with configuring motors. I have dual Maytech 6374 motors (150 kV, 08 A idle current, 65 A max current, 60 A rated current, max output 3550 W, ...
Jeff Kessel's user avatar
1 vote
3 answers
88 views

Unable to start and run 12 V DC pump, only jolts

I have a 12V 19 watt DC water pump (800LPH), A 12 V DC step down converter, and two Dewalt batteries. One at 18 V 5 Ah, other 18-54 V 9 Ah. I've connected pump to step down to battery correctly, but ...
David jones's user avatar
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1 answer
72 views

How to power ESP-12 (ESP8266) with LiFePO4 battery?

I've tried several different programs. A simple blinking program results in nothing. It works when connected into the programmer: The ESP12 has a blue LED. The LED blinks only when connected to the ...
adamaero's user avatar
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2 answers
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Battery voltage dropping without load: what does this say about its health?

I have three AGM batteries (VARTA LA95, 12V, 95Ah) that I want to connect in parallel in a battery bank. They were connected to a Victron charger for a long time and now that I turned it off, I began ...
Pedro Ferreira's user avatar
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3 answers
75 views

Powering 150W 24V DC motor

I have two very basic motors, basically this one: amazon Motor specifications: Power: 150W Volts: 12-24V Amps: 4.42 @ 12V, 4.76 @ 24V Speed: 3300 RPM @ 12V, 5500 RPM @ 24V The project is a robot ...
Sterling Duchess's user avatar
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Lithium battery pack in series or parallel

The goal is to build a 200V Lithium battery pack using 21700 cells. I am trying to make a design decision on lithium battery pack architecture for an electric vehicle and it boiled down to below two ...
EDMdude's user avatar
3 votes
1 answer
93 views

Charging car battery with another car - circuit schematic

I came across an example in a textbook that talked about charging a dead car battery with another car battery. They provided this picture of how to connect the two batteries: - Source: Engineering ...
Carl's user avatar
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1 vote
2 answers
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Designing a Power Supply for a 24V 350W Motor Using 18V Tool Batteries: How to Safely Parallel Them?

I'm currently working on a project where I need to design a device to power a 24 V, 350 W motor using 18 V tool batteries. The 18 V output from a single battery is sufficient in terms of voltage, but ...
Josh Jenkins's user avatar
2 votes
1 answer
32 views

2S Li-ion charger+protection with reverse protection

I'm designing a device powered by two Li-ions in series and I'm struggling with the charging and protection of the batteries. One of the requirements is to avoid battery packs, the individual cells ...
Jakub Kaderka's user avatar
1 vote
1 answer
90 views

12 V 20000 mAh Li-ion battery pack gets very hot

I'm trying to power a heated lunch box I got from Amazon (this one) via this - 12 V 20000 mAh Li-ion battery pack, which appears to be 6x 18650s. When I plug it in, the battery heats up significantly, ...
YanO's user avatar
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2 BMS in Parallel connected to 2 batteries in series

This circuit is for charging the two batteries only. The LED board will run on 3.7 volts, but 7-8 volts does not affect the function of the LED board. With this circuit, the LEDs will stay bright ...
Noel Trudeau's user avatar
1 vote
1 answer
40 views

Using 2-cell lead-acid battery as direct replacement for single-cell lithium-ion battery

I've designed a system that remotely logs some data (position, some weather data, etc.) in remote areas that currently uses a single lithium-ion battery (~850mAh) that is recharged via a solar panel ...
Microcontroller Enjoyer's user avatar
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1 answer
28 views

DfPlayer Mini not working when using three LR44 batteries

I'm working on a small project that plays audio. This project uses an ATtiny85 and a DFPlayer Mini as well as some other small components to make the whole thing work. I've tested the circuit using an ...
A Friend's user avatar
1 vote
1 answer
19 views

Can I use a MAX17262 to measure battery capacity of a 300mA 3.7V Lipo?

First, I a very basic understanding of lithium based batteries and from what I have learned, gauging their capacity can be quite complex. I was looking into MAX17262 as a fuel gauge to measure the ...
tronhawk's user avatar
2 votes
2 answers
36 views

Supplying 4 V (max 3 A) to my circuit using lithium-ion batteries

I'm designing a circuit for a portable device, and the main component requires 4 V (±5%) up to 3 A (12 W). The 3 A is the max for the circuit- typical load is 250 mA. As I understand, the voltage ...
oSmudge's user avatar
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2 votes
2 answers
55 views

Can you reliably use the voltage of an empty battery in a circuit?

I am making my first battery powered circuit. I am confused as to what happens when a battery is getting close to empty. Here is a quick example of what I am confused about: From my understanding a 12 ...
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