All Questions
32 questions
20
votes
4
answers
3k
views
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 ...
- 2,178
0
votes
3
answers
230
views
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 ...
- 23
1
vote
1
answer
269
views
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 ...
- 119
1
vote
2
answers
643
views
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. ...
- 1,428
0
votes
1
answer
1k
views
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: ...
- 3
4
votes
2
answers
737
views
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 ...
1
vote
1
answer
2k
views
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 ...
- 3,182
0
votes
0
answers
156
views
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
0
votes
0
answers
359
views
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 ...
- 51
1
vote
1
answer
526
views
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, ...
- 11
0
votes
2
answers
247
views
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 ...
- 657
5
votes
1
answer
2k
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 ...
1
vote
1
answer
8k
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 ...
- 323
2
votes
3
answers
288
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....
1
vote
1
answer
331
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 ...
- 57
0
votes
1
answer
97
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 ...
4
votes
3
answers
16k
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 ...
- 43
0
votes
0
answers
100
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 ...
- 1,906
0
votes
2
answers
724
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 ...
- 3
18
votes
9
answers
12k
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 '...
- 189
3
votes
1
answer
938
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.
...
- 2,086
4
votes
2
answers
2k
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 ...
- 2,086
3
votes
2
answers
1k
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) ...
- 61
0
votes
1
answer
240
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 ...
- 537
6
votes
3
answers
4k
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 ...
- 671
0
votes
2
answers
107
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 ...
- 103
1
vote
1
answer
291
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-...
- 597
5
votes
1
answer
827
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. ...
- 727
7
votes
1
answer
2k
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 ...
- 22.9k
19
votes
4
answers
11k
views
Pulse-powering heavy loads with a coin cell
Lithium coin cells are rated for fairly low standard current draws, on the order of 1 to 5 mA. Also, while they allow greater pulsed current draws (i.e., periodic bursts), this appears to be ...
- 4,972
43
votes
3
answers
41k
views
How is wristwatch with 10 years battery life possible?
Turns out Casio offers a handful of wristwatches with "10 year battery life". The claim is that thanks to "an advanced technology" the battery life in those watches is extended to ten years.
Now if ...
- 12.5k
6
votes
3
answers
4k
views
Lithium Button Cell Characteristics
I am working on a small wireless sensor platform and trying to figure out power supply options. My power budget is approximately: .2mA constant, ~15mA for .1s every 2-3s, and 60mA for 10s very ...
- 63