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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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58 views

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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2answers
49 views

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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4answers
63 views

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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1answer
145 views

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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1answer
98 views

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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820 views

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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1answer
61 views

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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2answers
101 views

HC-SR04 Distance Sensor Trigger Signal on 2.5V 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 3V (Nominal) voltage Coin Cell. The HC-SR04 is ...
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52 views

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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169 views

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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3answers
167 views

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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292 views

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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1answer
858 views

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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1answer
72 views

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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2answers
288 views

Running a magnetic buzzer using coin cell battery

I would like to operate a small magnetic SMD buzzer using a coin cell battery. However, magnetic buzzers require at least approx. 40mA to run, which I think is more than a coin cell battery can output....
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69 views

Any side effects when substituting bigger capacity battery in place of smaller capacity?

I have a car key fob whose batteries recently died. The coin slot says it accepts two cr2025 coin cell batteries. But I was thinking, since a majority of coin cell batteries run at 3v, I should be ...
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2k views

Lack of documentation on batteries? Trying to understand why LR1130 and LR1131 aren't equivalents

Recently I purchased some AG10 button cells for a device I have. The device specifically calls for LR1131 batteries, but someone online told me that AG10 was equivalent (and they are in a way: same ...
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1answer
63 views

Increasing Board VCC with op amp

I am trying to make a small board with an RGB LED on it. I would like to power the board with a nice small 12mm coin cell (3V). However the typical forward voltages of the RGB LED (and minimums) are ...
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334 views

Schottky diode in series

I have a circuit from u-blox website in which the backup voltage pin of NEO-M8N is connected to coin cell battery 3V. In the circuit, they put two schottky ss14 1A 40V in series with the battery. Is ...
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0answers
75 views

How can smart car keys work with such a small battery?

On my old car, I used to have a push button based key for my car. I push the button in the key, and the radio transmitter opens the locks. The battery lasted for 5 years. Easy to understand why the ...
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1answer
49 views

Should I use li-ion CR1220 cell or a different chemical type?

I have bought an RTC module that needs a CR1220 coin cell, but is supplied without one. Should I use a Li-ion cell or a different chemical type, and what advantages or differences are there between ...
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2answers
278 views

what is the difference between coin battery and alkaline battery

i'm quite curious with coin battery and alkaline battery. I have submerge 2 coin battery into the water and the battery short circuit and damaged after a while. While i put 2 alkaline battery into the ...
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1answer
118 views

Efficient alternative to a charge pump for stepping up a 3V supply to 3.3V?

I'm currently using a charge pump ic chip (http://www.digikey.com/product-detail/en/microchip-technology/MCP1252-33X50I-MS/MCP1252-33X50I-MS-ND/529831) for stepping up a 3V coin cell to a 3.3V ...
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9answers
8k views

Is it safe for a CR2032 coin cell to be in an oven?

I'm designing a portable temperature logger that I would like to be able to measure temperature within my home oven. I plan on designing a mechanical enclosure to hopefully protect the design from '...
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1answer
1k views

Is a battery's internal resistance a function of integrated current over time?

I've got a question regarding the internal resistance of a CR2032 coin cell. Here's some background info on the project I'm working on: I'm working on an electronics project in which I hope to have ...
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1answer
137 views

Capacitor charging circuit review needed

I recently posted a thread about using a coin cell to power an electronics project that features an SD card (here). The problem at hand is that the SD card will pull high current during read/write ...
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1answer
478 views

Is it viable to power a circuit board featuring an SD card using a coin cell battery?

I'm currently working on an electronics project implementing an SD card. It is also required that this device be portable and small, thus I'm attempting to use a coin cell to power the board. ...
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2answers
881 views

What is the 'continuous standard load' of a battery?

I'm currently integrating a coin cell power design into an electronics project. I am trying to verify my understanding of the 'continuous standard load' rating given for a battery (datasheet) When ...
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2answers
929 views

Coin cell regulation required?

I am designing a small PCB which I want to power using a CR2032 coin cell. The circuit will include a 555 timer, a 40xx TTL and a few small LED's. I chose both IC's with a minimum supply voltage of 2V ...
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2answers
408 views

Ultra low power input ORing/power muxing

I'm working on a project with three power inputs and I need to automatically switch between them (favoring the highest voltage). There are plenty of posts on this topic (especially on this exchange) ...
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1answer
296 views

Should a 555 IC remain powered when a [battery powered] device is turned off?

I'm fairly new to electronics. I wasn't able to find anything addressing this on the Web but that may be because I don't know the search terms to use. I'm trying to design a device that contains two ...
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1answer
160 views

What happens when discharging coin cell battery too much?

BACKGROUND: I'm working on a project where we use the nRF51 Bluetooth low energy chip, and our first prototype boards just arrived. So I've made some power measurements trying to calculate the ...
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2answers
947 views

Lithium coin cell battery showing randomness in voltage

I have a CR2032 coin cell battery and using that I am operating a BLE 4.1 module. When I connect a fresh battery in to the module the voltage shows 3.3 V, and after continuous communication with ...
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2answers
237 views

Adding to a circuit the ability to “remember” the last chosen settings when turned off or disconnected

If you could please bear with me: I'm just starting out in electronics and I've had an idea for a nice experimental mod that will also be useful. I've recently bought a pretty cool little 8 x 8 LED ...
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4answers
2k views

Coin cell battery retainer, problems and best practices

I use Memory Protection Devices BK-913 CR2032 Through hole battery retainer. I use Adafruit's CR2032 PCB footprint, which is almost identical to the recommended footprint in the datasheet for the ...
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3answers
373 views

Connecting LED to a microcontroller powered with CR2032 with discharge voltage range 3.3V to 2V

For my project I'm using a nRF51822 SoC with a CR2032 powering it. I'm using an LED with 1.5mA consumption to signal a rare event. The LED has to have 2 V to work. As the battery discharges, the ...
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2answers
86 views

Replacing 5 V pin with battery not working

I have a small breadboard that has a L293D motor controller and 2 DC motors. The board is hooked up to a Nordic DK and everything on the PWM side is fine. The breadboard is powered by the development ...
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1answer
455 views

Powering ATtiny85 for temperature sensing

I have been working on a miniature temperature sensing module which buzzes once the temperature crosses a threshold using ATtiny85, lm35 and a pico buzzer. When I power the whole circuit using an ...
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1answer
1k views

Driving an infrared LED from a coin cell

I am designing a remote-control type IR transmitter that will be powered by a coin cell battery (i.e. CR2032) and commanded by a microcontroller. The LED is pulsed at around 40kHz. How can I ensure ...
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1answer
2k views

How to use coin cell CR2032 in parallel with a power supply?

I have a device that is powered by a coin cell battery, but occasionally they fail and I would like to run them in debug mode to find the problem. Debug mode requires more power than the coin cell can ...
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2answers
269 views

Can I use lithium coin cell battery CR2320 for discharging about 80 mA at 3 V?

I need to use a coin cell battery as a source for supplying 3.0 V at about 70-80 mA for about 2 hr per day. The coin cell battery I want to use, its spec sheet doesn't tell me much about what I want ...
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1answer
230 views

Are there any high energy density (i.e. zinc-air or lithium-manganese dioxide) batteries without high internal resistance?

For my wild life camera, I want a small cell that can provide 0.5W for 8 hours or more. It doesn't seems rechargeable lithium ion batteries have that energy density. I don't mind if the cell is non-...
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1answer
358 views

USB lights up simple circuit but not coin-cell

I have 13 adafruit LED sequins in parallel hooked up to a CR2032 coin cell. This cell is also hooked up to an adafruit Gemma board (Arduino-like board using an Attiny85). Pads D0 & D1 on the Gemma ...
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2answers
3k views

How to make a color-changing LED circuit that runs off of a coin cell

I've been curious for quite some time about the 2-lead RGB color-cycling LED's. I know that they have 3 tiny LED's inside and an IC, but I'm really curious to understand what's going on in the IC that ...
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2answers
221 views

low power displays

What kind of displays can I use effectively with a coin cell battery (CR2450)? The backlight or the entire display would be on only when necessary. From previous answers I know that a liquid crystal ...
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1answer
619 views

Reliability of battery retainers for coin cells

I'm thinking of using a coin cell battery retainer on an upcoming project. The target application will be in a medium-to-high vibration environment with around 1-2 years between battery changes. ...
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3answers
7k views

How do I power a ATmega328 with a coin cell battery

Ok, so i am really keen to try replicate this project here I'm still a noob and my knowledge of electronics stretch as far as making a light blink using an Arduino (Maybe a bit more). I was thinking ...
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1answer
11k views

How long will a DS1307 RTC run on a CR2032 coin cell battery?

I have a homemade clock based on an atmega328 and a DS1307 Real Time Clock. When off, the DS1307 is powered by a 3V CR2032 coin cell, as usual. If I leave the clock off most of the time, how long ...
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3answers
4k views

Low power, seven segment display

I want to display a 4 digit number on a small device that fits in a hand. I have a CR2032 3V battery at around 230mA, my microprocessor is a 8051 (in a BLE112) usually uses about 0.9µA and I want the ...
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1answer
1k views

Boosting a Lithium Coin Cell

I made a board recently and just started checking it out yesterday. I used a typical lithium coin cell and a boost converter (Microchip MCP1640). With a battery plugged in I get no voltage out of the ...