Questions tagged [coin-cell]
A coin cell (also known as a button cell) is a small round cylindrical battery. They consist of a single cell and are typically 5-20mm in diameter but often only a few millimetres thick therefore having a similar profile to a coin or button.
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How are these pins glued/stuck/soldered on a cell coin battery?
I need to attach wires to a CR1620 cell battery, in a device I'm repairing with not enough physical space for a plastic "battery holder".
Even the smallest "battery holders" 3D ...
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Coin Cell Low Voltage Disconnect
I have a rechargeable coin-cell that needs to be protected from overdischarge. It supplys power to a Real Time Clock and SRAM ICs when my application is not powered(3.5uA). I was thinking of using a ...
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PCB Footprint Design of a Coin Cell Holder
I have a PCB that has issues with the coin cell bottom side making poor contact with the GND pad below it. Even with solder paste applied during the assembly, the pad is a bit inset of the soldermask. ...
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Confirming Application of LT1308
I am intending to power a small microcontroller off a coin cell battery. The microcontroller consumes as little as 15 microamps. I have a couple questions:
Just confirming, will the IC work with such ...
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Battery draining faster than predicted based on measured current draw
Summary: I have an LED circuit powered by a coin cell. It loses voltage faster than expected and the LED signal becomes too weak to be useful in an unacceptably short time period.
I have a circuit ...
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Is it safe to connect CR2032 cells in parallel?
As mentioned in the title, I would like to connect two CR2032 cells in parallel to increase their capacity. If they are slightly different voltages then won't the better battery "charge" the ...
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Powering RTC DS3231 through BAT pin while keeping the coin cell battery in place
I'm working on a battery-powered DSLR camera controller with a MCU (ATMEGA328P) that spends most of the time in deep sleep and a RTC (DS3231) that wakes up the MCU a few times a day to take a picture. ...
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Handling large current peaks on CR2032 battery
I’m designing a nRF52832 SOC based device and I came across this issue with energy buffering and battery voltage drop.
I am using a CR2032 battery, nRF52832 SoC and a VCNL3040 proximity sensor.
This ...
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Commercialising an electronic project - Li-ion pouch cells or coin cells?
I'm looking to move past the prototype stage and bring a small, low voltage, wireless electronic project to market. (it's a musical instrument)
The prototype incorporated a Li-ion pouch cell and USB ...
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ML2032 battery charger
I have recently bought some rechargeable ML2032 cells and also bought a charger for it.
Unfortunately the charger does not work, so I tried to find alternatives, but here the problem starts. According ...
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Best way to power a single LED from a battery
I'm looking for a good way to power a single LED with a coin battery (CR2032). Here are some of the requirements/characteristics of the system I'm trying to add this LED to:
I don't need full ...
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Resistor values for LED matrix
I am designing a binary coded watch with an attiny1616 MCU and an LED watchface. The matrix I designed is displayed below along with the rest of the schematic. The LEDs is 2.1V 30mA and I plan to ...
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Coin cell holder not powering circuit
I use a 3023 Keystone electronics, through-hole coin cell holder in my circuit. When I connect the Arduino to my computer, it gets powered up without any issue and my circuit works just fine.
The ...
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Circuit for charging a coin cell battery while also powering main circuitry
I am looking to design a USB rechargeable device that feature a small microcontroller set up to run at low clock frequency driving a few LEDs. I'd like to power it off a 2032 coin cell battery or ...
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TP4056 circuit - have I got this right?
I've designed and built this circuit which seems to work, but this isn't my day job so if anyone's able to take a look at it and let me know if you can see any flaws or potential improvements I'd be ...
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What are these types of coin cell contacts called?
I am working on a low-profile product that will be powered by a coin cell. I've seen some products that use coin cell contacts that allow the battery to be beside the PCB, rather than on top of it. ...
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When do I have to worry about shorting? (Coin cell battery assembly)
At work I assemble coin cell batteries (lithium metal) inside a glovebox. I'm a bit confused as to when I do and do not have to worry about shorting. For example, say I'm making this battery:
Cathode: ...
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HX711 powered directly from coin cell
Is it a good idea to use HX711 in a project (personal weight scale) that is powered directly from a coin cell (CR2032) without any external or its internal voltage regulator? I shut down the whole ...
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A question about "Coin Cells And Peak Current Draw" App Note
I'm trying to understand this small TI's app note called Coin Cells And Peak Current Draw, but I don't get it.
This white paper is interested in increasing the battery life of coin-cell-powered ...
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Power path management with coin cell
I have a small circuit which is normally powered by a CR2032 coin cell but also has a SWD header for programming. I made a simple power path switch so that when I am programming, VDD is supplied by ...
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Coin cell UV pendant Q2 [duplicate]
I am a beginner with LED lights, but would like to use a 5mm 365nm UV LED diode to make a pendant with a small fluorescent crystal.
I would like to create a very simple, very compact circuit with a ...
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Coin cell to power a 5mm UV LED?
I am a beginner with LED lights, but would like to use a 5mm UV LED to make a pendant with a small fluorescent crystal.
(This is what I purchased (https://www.amazon.com/uxcell-365-370nm-Ultraviolet-...
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Switching between VCC and V_BAT
I am designing a circuit for a GPS receiver IC and RTC.
As both of them require a V_BCKP connection I will be using a CR2032 (non-rechargeable) battery for V_BAT supply.
To make sure the minimum use ...
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What is the maximum voltage of a coin cell battery? [closed]
The nominal voltage seems to be 3V for a coin cell battery (e.g. motherboard battery), but what the maximum of a fully charged battery fresh out of a package from the factory? What is the theoretical ...
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Coin cell batteries that are 1V or lower?
Does anyone if there are any coin cell batteries that are 1V or lower? I did a Google search and I checked on websites like Mouser, Digikey and find that the smallest voltage is 1.4 or 1.5V
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IR Leds to be Driven by Coin cell
Can a coin cell with rating >= 500 mAh be used to drive a set of 3 IR LEDs if each takes 100 mA forward current? I'll be drawing 300 mA (3 LEDs) current continuously from the cell, I heard that ...
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Recommended discharge current of coin cell
I am thinking of using small coin cells to power white LEDs (20mA @ 3V FWD voltage). When I look at some coin cell specs sheets, I've seen "recommended discharge current" of only a few mA or ...
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Is boost converter enough to provide pulse currents without drawing too much current from a coin cell
I am making a RF circuit which could operate using a 3V coin cell battery like CR2032 or CR2450. In sleep mode it consumes around 10-20uA but during Tx/Rx which lasts for 10ms it consumes ~300mA-ms. ...
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Powering a RF circuit with CR2032 along a capacitor, pulse currents of 150mA
I am designing a battery powered circuit which performs RF communication. The goal is to use a 3V CR2032 battery. The RF circuit consumes 0.2mA as average current and lowest voltage it can work on is ...
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Connecting a supercapacitor to a supply with voltage lesser than capacitor's rated voltage
I am connecting a 3V power supply (CR2032/CR2450 coin cell) to a 1.5F 5.5V rated supercap. Given that the supply voltage is lesser than rated voltage of supercap, chances of any damage become minimal. ...
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Calculating Battery Life with different working voltages
I have device that draws 30 uA in current continuously, and it is powered by a Panasonic CR2032 device (240 mAh - continuous standard load current: 0.2 mA ).
There are two components on this device, ...
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Powering modules permanently with 3V lithium coin battery
I am going to use a MCU + bluetooth BLE module. Its VCC pins are going to connect directly to the terminals of a 3V lithium CR2032 battery, for example a standard 170mAh one. 99% of time the module ...
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How to use CR2032 in parallel
I want to use multiple CR2032 batteries in parallel for higher capacity in a wireless RF remote (1.8-3.8 V working range for the RF MCU).
CR3032 is an option but I rejected it due to price and ...
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Is there a low voltage LED alternative?
I am trying to create a tiny little watch that is supposed to run off a coin cell (because it is so tiny) and basically just a microcontroller with a 30ppm 1Mhz oscillator that counts upwards. The ...
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LM4890 amplifier and CR1616, how to improve power consumption?
I'm a hobbyst trying to design a simple circuit for amplifying the PWM audio output of an ATTINY85. I'm using an LM4890 (1W amp) and a 1W microspeaker. The problem comes when I supply 3V with a small ...
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Diode behavior when reverse biased with small voltage
I'm designing a simple circuit to use a lithium-metal coin battery as a backup power supply, and I'm considering something simple like this:
simulate this circuit – Schematic created using ...
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USB and coin cell battery switching
I'm trying to do a simple, low power, low cost power "switch" for a custom board (I know, it will be complicated).
The device will be powered by default by a coin cell battery (3V3 and lower) and can ...
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Monitor coin cell voltage without loading it when power is off
Is there a good way to monitor a CR2032 coin cell's voltage, that does not load it down when other power is off?
We are using a CR2032 coin cell for a battery-backed real-time clock. When main power ...
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Does the switching frequency and ON/OFF time duration of LED affect the power consumption of LED?
I want to drive the electronics consisting a controller with different peripherals on its I/O pins, one of which is LED, with 3V coin cell battery supply.
I want to determine if its switching ...
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Protecting a coin cell from high current spikes - using a capacitor or not?
I've built some prototypes and try to gather some data from them. Skip below the two horizontal lines to read more about it.
Original Question
Brief summary
I would like to know whether it is ...
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Interfacing coin cell back up for internal RTC of ESP32
In esp wroom-32 all the VDD pins has a common connection. It includes VDD_RTC too. So in case of power failure if I switch the power between main DC source and coin cell using a mosfet, will it create ...
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How to calculate CR2032 battery life with LED
I want to power an LED that has a 3.3V forward voltage using two 3V CR2032 coin cell batteries to create a 6V supply. I set the resistor for a 20 mA current. For my application, the LED will be turned ...
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nRF52382 low power RTC data lost
Posting here, since Nordic DevZone is broken for me (Made a long post that didn't upload, just kept loading).
I am currently approaching this from HW point of view (I personally not developing ...
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HC-SR04 distance sensor trigger signal on 2.5 V voltage level gives no reading
I am using an Arduino on a breadboard setup with an ATMEGA328p MCU. The whole circuit is designed to work in a low-power state and is powered using a 3 V (nominal) Coin Cell.
The HC-SR04 is getting a ...
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Capacitor for handling startup current of DC-DC converter shows different behavior
I’m using a 5V DC-DC converter to step-up a coin cell (Nominal Voltage: 3V) to 5V which did not work. I suspected that the high startup current of the converter was causing the Cell voltage to drop, ...
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Powering 5V external sensors from 3V Coin Cell Embedded System
I have a customized circuit using ATMEGA328p with Arduino Boot-loader to develop a Wireless Sensor Network which sends readings from a JSN-SR04 Ultrasonic Sensor to another node via nRF24L01+ wireless ...
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Can you build a battery from scratch which is able to make a computer run?
I'm learning about batteries and I'm really fascinated by this topic.
I saw some online videos on how to build some "Voltaic Pile - like" batteries with coins and other kind of cells in different ways....
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Can I use 3v CR2032 to power multiple vibration motors?
I am planning to use a 3v Arduino pro mini with 2 coin cells (3v CR2032 each).
I also need to connect 6 flat vibration motors in series rated as follows:-
Rated Voltage: 3v,
Rated Current: 70mA
Can ...
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Coin cell battery recharging circuit for RTC backup power
I am designing a system that contains an RTC to for displaying the date and time on a user interface, as well as log events with time stamps. In this particular case, the system gets powered-on at ...
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lithium coin cells, safe to completely cover? lightweight method to protect from the environment
I am trying to make equipment to measure temperature in small mammals, probably attached to a neck collar. The collar needs to be very lightweight (e.g. <3g total) so I am planning to use a ...
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