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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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 invertor. I did not connect ...
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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 ...
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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 ...
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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 ...
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DC voltage amplifier circuit with up to 10kV output, up to 1mA
What components would I need for a circuit that would be able to magnify an input voltage in the 10s of volts at an appropriate wattage to produce an output voltage of up to 10kV at 1mA? I've read ...
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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 ...
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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 ...
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Buck/boost converter behaviour when MCU is sleeping
I'm building an optical wireless mouse based on nRF52833 and a 16340 cell, I need a sanity check on some considerations regarding the DC regulation.
The battery voltage goes from 4.2V when fully ...
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What to look for when selecting a lithium ion battery charger IC
I'm looking into battery charging ICs for a 3.7V Lithium Ion battery, and want to make sure I understand the criteria involved in searching for such an IC.
The obvious one is to make sure the IC is ...
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Disable output using battery protection IC
I am trying to design a pretty simple battery pack for a project, I'm relatively new to designing circuits, and I had a couple of questions I was hoping to get some advice on.
The circuit I'm ...
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How to add 2 or 3 parallel Li-ion cells to my custom PCB
I've tinkered with electronics and components for quite some time now, but I'm kind of a noob when it comes to taking things to "production".
I've this project using an ESP12-E, powered by 2 ...
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Making a high-temp, battery-operated, heating/burning device
Crazily enough, this is not for recreational smoking use.
I am trying to create a small, battery powered device, that can hit temps around 250 to 350 degrees Celsius (482 to 662 degrees Fahrenheit), ...
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Preventing backfeeding buck converter
I have a device powered by either USB or a single-cell NiMH, like in the diagram below. The boost converter is resistant to backfeeding, but I need to prevent backfeeding the buck converter when ...
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How do you create small devices that can remain "dead" for a very long time without damaging the battery?
I'm working on a product that uses a very small 20mAh lipo battery. The device only needs to operate for 8 hours, and that's not a problem. However, I expect that customers may run the device until it ...
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LED : Efficiency vs Forward Current (rather than Light Intensity vs Input Current)
LED Characteristics
LED datasheets commonly provide:
\$ I_{v}\ [cd] \$ Light Intensity vs \$ I_{f}\ [A] \$ Forward Current
\$ V_{f}\ [V] \$ Forward Voltage vs \$ I_{f}\ [A] \$ Forward Current
(...
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Read battery voltage for external RTC on STM32
I am using STM32F446RE for my application to just log the time accurately. I have an RTC module DS3231SN connected to the STM32 on the I2C. The RTC is connected to a coin cell battery CR2032 for a ...
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How do I calculate the type and size of battery to use for this solar-powered USB charger?
I've been out of the electrical mathematics for a while and want to see what battery I need to do this.
5 V USB output, 5 V DC solar power panel (I do have two I could use together, assuming the ...
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ESP32, pin powering a 5V circuit: which MOSFET, transistor, octocoupler ...?
I want to have a DFRobot FireBeetle 2 ESP32-E board (connected to a 3.7 V Li-Po battery using the integrated battery circuit) drive a 5 V circuit. So I figured out that I need a step-up boost ...
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How can I improve the algorithm for switching between lithium ion batteries with different voltages?
I have made a device which switches between 2 different lithium-ion batteries with different voltages and only puts them in parallel when their voltages are the same. Lithium-ion batteries' voltage ...
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STM32 development board design
I am making a board to learn STM32 with a future Li-Po battery powered project in mind. The aim of the project is to have a device that wakes up a couple of times a day on its own and can also be ...
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Are these components safe to use together?
I am hoping that someone has some time to help me double check to make sure these components are safe to use together? Everything seems like it checks out, but I would really like to get a second ...
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ESP32 power efficient battery monitoring
I'm trying to implement a simple battery monitoring circuit for an ESP32 that gets completely shut down and then powered on periodically. I don't want to drain the battery and/or backpower the ESP32 ...
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How long will Li battery with 100 mAh last when my MCU runs 1% of the time?
I am planning a hand-held design (similar to a remote control) using an STM32F030. It is low cost and has good low power options.
There are alternative devices on the market which are pin compatible ...
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Detect battery type (NiMH, 14500, alkaline) and only charge the rechargable types
I'm building a flashlight that uses AA size batteries. I want to automatically detect the battery type and charge it with the appropiate method, and also detect alkaline cells so it won't try to ...
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How can I avoid this crosstalk issue?
I have cutout a piece of my PCB that generates the crosstalk (I measured with multimeter.)
In the middle I have a 3.3 V boost/buck converter which generates power for my ESP32. On the left there is a ...
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How to add 12V PSU and 12V battery together to power the PCB
I have designed a PCB. Now I am facing a issue that I want to use 12V PSU and 12V battery together so that if 12V PSU fails then 12V battery can supply power to PCB.Battery charging is not part of the ...
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How can I wire a MOSFET to put 1.5 A through a short length of nichrome wire using an 18650 battery and an Arduino?
I'm doing some antenna deployment work on a CubeSat testbed prototype for a school club. Here's a wiring diagram of what I'm doing:
I'm using two 18650 batteries to power an Arduino which ...
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Wiring multiple 5.2 V Li-ion booster modules outputs together to get 3 A output current
I need help figuring out how to wire booster modules in parallel for a high current output. I'm using four 18650 batteries to power a tablet I'm putting together that runs on a Raspberry Pi 4, and ...
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How can I reduce the spark while connecting the battery?
I've been working on a drone that works on a 12S batter (maximum 50.4V.) I am using an Amass XT90 anti spark Connector to connect the battery to the power distribution board (PDB.)
The drone has an ...
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Is there such a thing as a “corrosion break”?
More often than not, battery powered electronics will result in a battery that leaks, which if not caught, can corrode the whole circuit.
I recently bought a used piece of electronics with battery ...
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Battery charger voltage question
I'm using this Battery Charger IC
I completely charge the battery to 4.17V and it is indicated by the STAT2 pin, turning ON of the GREEN LED.
After a couple of minutes, I unplug the USB cable and plug ...
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Power Regulation
I have a Li-Ion 3S1P Battery Pack with built in BMS rated:
Typ. Capacity: 5000 mAh
Nominal Voltage: 10.8V – 11.1V
Charging Voltage: 12.6V
Discharging Voltage: 9V
I need to power an STA540 in stereo ...
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What does a 9 A battery do to a 3 A motor when using the battery for movement?
I am trying to figure out why my battery keeps discharging so quickly. I have a 12 V, 9 Ah (valve regulated) SLA battery that I use on the bench to test motors. I write a small program, test the ...
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How do I convert a battery's 3.7 V, 2.7 A input to 24 V, 400 mA output? 12 V, 800 mA would also work
I want to use a single Li-ion cell to drive a 24 V, 10 W PTC heater cartridge in a cost-effective manner with closed loop control from a MCU (RPico + 10 kΩ NTC thermistor).
Is boost or boost-buck ...
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Only connect consumer to battery on button press
I want to build a toy for my daughter. It contains a couple of buttons and each of them play a different sound.
I have a 3.7v 500mAh battery, a tp4056 battery charger and a dfplayer audioplayer.
This ...
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I'm having trouble understanding this P-N MOSFET Li-po power management circuit
This circuit is for a portable ESP32-S3 based device running off a 4.2V 2500mAh Li-po battery.
BAT_VMES, is the voltage divider output with 100nF bypass cap. connected to an ADC
pin on the ESP32. ...
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Trying to power a MC145010 smoke detector without a battery
I'm trying to make a cheap MC145010 based smoke detector "smart" by adding an ESP8266.
Since the ESP8266 needs plenty of power, I have 5V around. I'd ditch the 9V battery that powers it.
I'm ...
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How to trick a BMS into thinking the battery is connected?
I purchased a Wireless Audio Adapter off of Amazon for a DIY sound system. The sound system runs off a wall switch, but because there is a battery inside the device it stays powered on after switching ...
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Optimising standby current of battery operated designs with momentary power activation - circuit example from digital level
My digital level flattened its 9 V battery within 2 weeks of little use, so I measured its standby current which came out at nearly 2 mA!
I took the cover off was shocked to see the battery connected ...
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How can I connect two motors in parallel with different RPM and voltage?
I have a kid's electric toy car with a 12 V battery and 2 DC motors (Model: RS380/6 V & 12 V with 15000 RPM) connected to battery in parallel and to wheels using gearboxes. For some reason, the 6 ...
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Can the RP2040 be powered by two AAA batteries alone?
I want to power the RP2040 using two AAA batteries. In the official documentation it says, if I don't care too much about USB and a good ADC, I can go as low as 1.8 V to power the chip. I don't want ...
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Battery isolation monitoring
I am looking to design a subsystem for EVs operating at 650 VDC. According to the requirement FMVSS 305, all subsystems of the vehicle need to have isolation monitoring.
I found Texas Instruments' ...
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Using a ULN2003A to drive a solid-state relay
I plan to use a MSP430 microcontroller to drive three different DC-DC solid-state relays. The thing is that the MSP430 provides a digital output of only 3 VDC @ 15 mA. (Vol: low-level output voltage).
...
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Can you charge and discharge a Li-ion powerbank at the same time?
I thought that you could charge and discharge a battery at the same time without issue, but after googling I find that half of the articles say that you can't do that (or you can, but the battery life ...
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Wemos D1 mini (ESP8266) consumes too much power in deep sleep 1.5mA on 3.2V battery
I am running some battery driven powered temperature sensors in the house.
Measuring the current with my multimeter shows that the Wemos D1 consumes 1.5 milli amps in deep sleep. I was expecting a ...
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High-side switching: Load switch IC vs P-channel MOSFET
I want to switch the power in one part of a circuit with a 3V0 GPIO. The circuit is battery-powered and only active for a short duration once an hour, so I want to use as little power as possible. The ...
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Calculating battery run time
How long will a 12 V, 35 Ah battery powering a 5 V, 1 A device last? Yes, there is a 12-5 V converter in this circuit.
Is the correct method for finding the solution to convert both sources to watts ...
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Feedback on PCB-layout wanted
I'm currently making a weather station as a personal project. It will consist of one BLE peripheral and one BLE central. I will fabricate both as one PCB, and panelize them with a vcut.
As mentioned ...
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Choose battery for ultrasound transmitter circuit (voltage and current rating)
I would like to build this circuit which is an ultrasonic speaker (from this YouTube video, skip to time 3:53 for the schematic, and also see the designer's website) but I don't know what voltage and ...
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Which drains first when connecting Battery A -> Battery B -> Load? [closed]
I have two large commercial USB batteries I need to combine to produce power for a 10hr period. Each alone can power my load for ~6-8 hours.
Reading a few other articles:
Can batteries be charged and ...
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