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Questions tagged [battery-operated]

Involving or pertaining to a circuit or device that is intended to be operated with cells or batteries (as opposed to mains power, for example).

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Is it possible to get a dual supply from 2S Li-ion battery which has a battery protection IC connected to it

In the image below, can the node connecting cell 1 and cell 2 be used as ground and PB+ as the positive rail and PB- as the negative rail? Those positive and the negative rails will then be regulated ...
Pranav Agumbe's user avatar
1 vote
0 answers
14 views

Creating a short signal transmission in HT12E based RF communication

In HT12E we continuously transmit even when the input data pins are not changed.My problem is battery optimisation. I am transmitting only ON/OFF switch state through HT12E based RF module and Since ...
Anandhan A's user avatar
1 vote
0 answers
24 views

Low Quiescent Current over USB Type-C [closed]

I'm working on a battery powered project which I'm currently planning on powering over USB Type-C for flexibility. The 5V/3A spec would satisfy my needs for the high end of power draw, however, I want ...
TianCilliers's user avatar
0 votes
1 answer
16 views

Managing Solar Power, battery, and load for raspbery pi - designing power management system

So, I am working on a scientific instrument that measures air quality. It uses a raspberry pi with a couple of sensors. Essentially, this instrument is going to be deployed in an Urban area in a ...
Jack's user avatar
  • 1
4 votes
5 answers
579 views

Do the decoupling capacitors act as capacitive load to the opamp which is used to make a virtual gorund?

Source: https://tangentsoft.com/elec/vgrounds.html I am trying to design a circuit using a single battery as shown in the image above, I am worried that all the decoupling capacitors that will go from ...
Pranav Agumbe's user avatar
3 votes
2 answers
104 views

Are these cells likely to be in series or parallel or both [closed]

Here is a Dell product that is battery operated. Link to a website selling a Dell computer. The buyer can choose from 3 battery options. From this would you infer that the different options produce ...
H2ONaCl's user avatar
  • 401
6 votes
5 answers
2k views

Best way to halve 12V battery voltage for 6V device, while still being able to measure the battery level?

I have a device that is powered by 4 AA (4x1.5V=6V) batteries, but I want to power it with a 12V battery. The device measures its input voltage to determine the battery level. I only need to know if ...
Juicer's user avatar
  • 377
1 vote
1 answer
97 views

Can I charge multipe 18650 lithium cells at fixed 4.2?

This question is edited. I am currently working on an emergency light and I want to power it with 4 18650 cells in parallel. I've tried using TP4056, but that is really slow. It takes well above 10 ...
Saad Nisar's user avatar
9 votes
4 answers
2k views

Why does this battery use 4.2 V when its nominal voltage is 3.7 V?

I changed my headphone power circuit and I noticed it was using 4.2 V to charge a 3.7 V battery. I am confused why it is using 4.2 V. I know to charge a battery you need more voltage than its rating, ...
Ray's user avatar
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0 answers
35 views

Running Teensy41 on battery

I'm trying to get my Teensy41 project to run on battery. The docs at the link below seem to indicate that connecting 5v across VIN and GND pins should be enough to run on battery. Initially I am just ...
Hubert B's user avatar
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0 answers
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Schematic review of lipo charger

please review my schematic for battery charging
Poupiloup Polpy's user avatar
2 votes
0 answers
109 views

Powering a microcontroller with an Li-ion Battery --> How to choose a protection?

The introduction I'm currently working on a low power project that is using the ESP32-S3 microcontroller variant from Seeed Studio, the XIAO Series ESP32-S3 (Official wiki: https://wiki.seeedstudio....
Benjamin's user avatar
-1 votes
1 answer
61 views

Power two microcontrollers with different voltages from one power supply [closed]

Background: We want to extend a Lasertag blaster with a Raspberry Pi Pico microcontroller (and more peripherals, e.g. LEDs, IR TX & RX, buttons). Goal: Use the existing 4xAA battery source (6-7V). ...
Felix S's user avatar
  • 99
3 votes
3 answers
169 views

How to light up a rocker switch powered by a battery of only 1.5v?

I have a small hobby project for which I wired 4 AA batteries in parallel to achieve the desired result, which comes to 1.5V, as the batteries are in parallel, which is what works for my project. My ...
electrical's user avatar
0 votes
2 answers
39 views

Vcc for MSP430FR6047 with a battery- Ultra-Low-Power system

I want to design an Ultra low Power device with MSP430FR6047, which can work over 10 years. For the supply power of MSP430FR6047 in the datasheet it is mentioned that the voltage on the supply pin ...
Andromeda's user avatar
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0 votes
2 answers
42 views

D-cell Ni-Mh 12v battery-pack (10S) ok for a 12v device that can be a little heavier/bulkier?

In a previous question I was asking about a way to use dc charging in combo with an 18650 battery pack for an audiobox. Since site rules mean I cannot change or add to that question after it has been ...
Respoda555's user avatar
1 vote
2 answers
191 views

Soft-power-on switch and USB power

I am using the following circuit to create a soft-power-on button, based on schematics I found online. simulate this circuit – Schematic created using CircuitLab Pressing S1 switches Q1 ON, ...
tagy22's user avatar
  • 67
0 votes
1 answer
59 views

Battery size needed for a submersible pump

I bought a small solar fountain pump which does not work well on cloudy and monsoon days. So I want to hook this pump on to a battery which I am considering to recharge once in a month. The pump has ...
Baxu's user avatar
  • 3
0 votes
0 answers
39 views

PIR Sensor Interference When RF Transmitting

I have created a small DIY circuit which sends a signal over 433.92Mhz when a PIR sensor is triggered. The circuit consists of 4 modules soldered onto stripboard. Schematic: Components are: 0.71mm ...
Jonas's user avatar
  • 179
0 votes
1 answer
77 views

What's the best way to make sure I have a known VCC on a battery powered device?

I'm making a portable device (well not really portable, but intended to be set up away from mains power) powered by AA batteries. I need a stable VCC as I have displays that I don't want the ...
Steam Ranger's user avatar
1 vote
1 answer
89 views

Is it possible to draw 12V from both halves of a 24V battery pack?

Firstly, I am fully aware of buck converters. This question is all about the possibility of my imagination. I have a 24V battery pack, powering one 24V device. Because I am able to tap into the middle ...
Aura's user avatar
  • 133
0 votes
1 answer
43 views

Battery-powered device: trade off between voltage and power requirements

I'm designing a device that would be powered (LiPo I guess) by rechargeable batteries. They will be charged externally. The power requirements are the following: the load runs at 12 V (pump and few ...
Mark's user avatar
  • 1,235
3 votes
2 answers
352 views

Powering a Raspberry Pi Zero with a Li-po battery

I want to design a circuit to power a Raspberry Pi Zero using a single-cell Li-po battery (3.7 V). I'm working on a portable hobby project that's required to be battery powered and allows recharging ...
Amir Rachum's user avatar
1 vote
1 answer
57 views

Low power consumption/leakage tips and tricks (input NC magnetic reed switches)

I have an ATtiny412 that has 2 pins (PA1, PA2) set as internal input pullups. These 2 pins (PA1, PA2) sense magnetic reed switches with the NC setting. GND is active when closed on these switches. The ...
Jonas's user avatar
  • 179
1 vote
1 answer
43 views

What type of memory should I use in a temperature datalogger with battery?

I'm designing a temperature data logger that will operate with a CR2032 battery, but I'm unsure what storage device would be good to use in this application. I would like to have capacities greater ...
WalterPH's user avatar
  • 440
0 votes
0 answers
24 views

Powering vibrator for clearing vacuum cleaner filter

I've found that one easy way of clearing the corrugated filter in many vacuum cleaners is to tap it lightly with a hammer. I suspect that using a vibrator would be more effective, and I would like to ...
Bill Bell's user avatar
  • 129
2 votes
1 answer
183 views

Where to connect shielded cable when you have no chassis?

I joined a project after some of the initial design decisions were made, so it’s not quite how I’d like it, which now presents me with a bit of a problem. I have two power cables that are emitting ...
Sylvester's user avatar
2 votes
0 answers
187 views

Problem with battery power circuit

I am a 14 years old boy and I am currently making a MacroPad with a 3.7V battery and a charging circuit but powering the circuit with a battery does not seem to work. I also have made some ...
Loic Daigle's user avatar
0 votes
0 answers
55 views

Is my PCB shorting to ground?

I am working on a senior design project that utilizes a 3.7V lithium ion battery. Before I connect to the board, the pins show 3.7V (as expected). When I plug the battery into the connector, measure ...
Carson Green's user avatar
0 votes
1 answer
82 views

My MQ6 gas detector stops working properly after some time when using a battery

I've connected an MQ6 gas sensor to the output of a 78L05 5 V regulator, with its input connected to the + terminal of a Duracell 9 V battery. The DOUT pin of the MQ6 is connected to the - terminal of ...
Aminos's user avatar
  • 103
0 votes
0 answers
42 views

Alternate power supply for dashcam, with latching relay

I am trying to setup dashcam with a dedicated battery for my car, I have a crude diagram to explain my logic. Yet to figure out detailed specs. The dashcam will run as usual car's ignition power, when ...
Alex Robbin's user avatar
3 votes
1 answer
336 views

Am I doing something dangerous with an AC to DC power supply?

I am new to electronics, and want to check to make sure I'm not missing critical points of safety, or setting myself up to do something stupid/dangerous. The project I'd like to build is a compact ...
cyanshark's user avatar
1 vote
0 answers
144 views

Power issues with Nodemcu and Sim800L

I am building a project and i am facing weird anomalies while implementing it. Keep in mind in a student a fairly new to this. So the problem is that i have a usb- charging module connected with a ...
Solo's user avatar
  • 45
0 votes
1 answer
91 views

Resistor value to minimize current drawn from battery in an Arduino project

My Arduino project (Pro Mini, two sensors, BT09 BLE module) is powered by a PG1050 3.7V battery via a boost converter that raises the voltage to 5V. To measure the battery and report low battery ...
dobre dani's user avatar
0 votes
1 answer
113 views

Building a battery powered computer system

I want to power a PC, monitor and modem with one deep cycle 12 V lead-acid battery. The PC is a mini-ITX board with intel N100 CPU. It consumes between 10-40 W depending on usage and has a 19V DC ...
AN C's user avatar
  • 11
0 votes
1 answer
215 views

Voltage regulation for NodeMcu

I am trying to develop a custom PCB with the esp12-E module. For development and testing, I am using the nodemcu development board ESP8266 V3. I am powering the nodemcu via a 3.7V battery with a ...
Solo's user avatar
  • 45
0 votes
1 answer
759 views

How to create an electric fence for slugs and snails using a car battery

There are electric fences that are made using a regular 9v alkaline battery and two wires. One wire connects to the positive terminal, the other wire to the negative, and they are wrapped around the ...
oak savannah's user avatar
3 votes
2 answers
333 views

What size portable battery do I need?

I need to power a 10 W device to operate 16 hours a day on a 50% use capacity. So 10 W device running 8 hours a day I guess. I need to run this device from a battery pack as no AC is available. How ...
Marty Lax's user avatar
1 vote
1 answer
77 views

Parallel charging lead-acid batteries that are at different voltages

For a project of mine, I'm making a battery pack that disconnects the internal battery after switching to an external battery. I'm a bit worried about parallel charging lead-acid batteries that are at ...
sebasdt's user avatar
  • 11
2 votes
5 answers
484 views

Why does the frequency of an astable multivibrator depend strongly on the supply voltage?

More specifically, my question is why does the natural frequency of the canonical (basic) symmetric transistor astable multivibrator (STAM) vary so strongly on the power supply voltage? As a follow-...
Optik's user avatar
  • 23
0 votes
1 answer
81 views

Circuit to convert 14.8v battery with max 4a discharge current into 12v, 9v and 5v output?

I am making a robot with multiple devices mounted on top. I am planning to buy either a 14.8v or 11.1v Li-ion battery which has internal BMS limiting maximum discharge current to 4A. Now I need 9v for ...
devansh's user avatar
  • 45
1 vote
0 answers
110 views

Use 2s LiPo Battery as Battery Cell for Microcontroller

Is there a convenient way to use a large 2s LiPo battery (such as this one) as a power source for a microcontroller and LED strip? Specifically I'm looking for the ability to seamlessly switch between ...
ashbygeek's user avatar
  • 111
0 votes
0 answers
138 views

Choosing LDO to power ESP8266 on lithium battery

I want to power ESP8266 on lithium battery with a PIR sensor and have a small solar module to charge the battery, there is also weird looking 3pin transparent light sensor that by guess testing I ...
asim's user avatar
  • 600
1 vote
1 answer
87 views

1.5 V LDO regulator for lithium-ion cell conversion

TL:DR: I want to power a 1.2 V motor with a lithium-ion cell. I have a electric shaver and a trimmer that uses a 1.2 V NiCd battery cell. I'm surprised that, in 2022, I can still buy NiCd battery ...
jjrfadpammtpiagkjq's user avatar
4 votes
2 answers
213 views

Weird DC motor behaviour at low PWM duty cycle

I am back with my brushed DC motor PWM project. From all the previous replies I got, I've settled with and built a simple one MOSFET circuit as follows: The motor is a LEM130 from Lynch Motors (about ...
Solmyr999's user avatar
  • 149
2 votes
1 answer
130 views

Which battery to use for fridge temperature monitoring sensor?

Is there a difference with using two AA batteries versus a lithium coin cell battery versus lithium AA battery? I have found the lithium coin cell (CR2032 3v) is not lasting long. Would changing to ...
Applebee's user avatar
0 votes
0 answers
103 views

Solution to Parallel Lithium Batteries with same VSUM but huge SOC difference

I have a query regarding charging lithium batteries in parallel. I have attached 3 batteries in parallel set dip switches correctly and connected the com wire to my solar inverter. I did not connect ...
Mansoor Akram's user avatar
0 votes
2 answers
814 views

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
  • 13
0 votes
1 answer
125 views

24v Electric car kiddie regen brake issue [duplicate]

Looking for some help please. We manufacture small off road Land Rover Defenders for holiday parks and the likes. Up until recently these cars have run off 3x 8v lead acid batteries with a ...
Chris Tunstall's user avatar
0 votes
0 answers
26 views

Input/output USB power flow control depending on battery powered or wired

This seems like a very basic problem but I cannot really find a solution or come up with one on my own. The setup is simple (also picture for clarity): A circuit that takes 5V input Put a UPS with ...
André's user avatar
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