40 votes

Lithium Coin Cell CR2032 battery specifications

I did my PhD thesis on energy management in wireless sensor networks and was working with sensor nodes using CR2032 batteries. We designed the nodes ourselves (my supervisor designed the PCB and I ...
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  • 491
19 votes
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How to calculate the maximum current a AA battery can deliver for a short period of time?

WARNING: If "trying this at home" be aware that there is a small potential for significant hazard occurring - see below. What you propose is a viable and useful and potentially dangerous method. I ...
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  • 143k
15 votes

Are AA battery and 18650 battery the same?

An AA cell is not the same as an 18650 cell. 18650 designates lithium-ion batteries of nominal voltage 3.6 Volts each. These typially consist of the actual lithium-ion battery and some circuitry, as ...
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15 votes

Explosion in a battery

If your circuit is drawn correctly, then the current is flowing backwards through the 1.5V cells. This is like trying to (re)charge them beyond their design voltage. It is very bad for them, and yes, ...
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  • 12k
14 votes

Lithium Coin Cell CR2032 battery specifications

From the data sheet: Nominal capacity indicates duration until the voltage drops down to 2.0V when discharged at a nominal discharge current at 20 deg. C So, if you discharge at a steady 0....
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14 votes
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Explosion in a battery

What you are trying to do here is conceptually flawed, and as you were fortunate to discover without injury, potentially dangerous. Do not try to subtract battery voltages If you want a 6v battery, ...
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11 votes
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How does a battery ( primary cell ) work?

is an electric field already there, before connecting it to a wire? Yes otherwise no current would be able to flow through a load connected to the battery contacts. The electric field is what makes ...
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9 votes

Connector Problem. How to conveniently connect with cell-phone LiPo batteries

The only way to connect those batteries properly is using spring loaded contacts, because you have to apply steady force to maintain low contact resistance. There are manufacturers out there, who ...
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  • 3,533
9 votes

How to calculate the maximum current a AA battery can deliver for a short period of time?

If the current is too high it will blow the fuse on the multimeter, or blow up the battery. Wikipedia says the Energiser AA battery has an internal resistance of about 0.15R at room temperature. This ...
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8 votes
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Charging a 3.7 V with a 5V usb charger

Ok, so you aren't actually asking the right question. I'm going to assume you mean you have a 5V power source (usb, battery pack, etc.) and want to charge a single cell lithium ion battery with ...
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  • 281
8 votes

Lithium Coin Cell CR2032 battery specifications

I think the answer is in this graph of the datasheet: If you draw vaguely 10mA (\$3V \div 300\Omega\$) 5 seconds at a time, you will see the voltage fall off more over time, and the overall capacity ...
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8 votes
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CR2032 alternative for higher current

50 mA is too much for a "coin cell". A CR2032 is already a fairly large coin cell, although there are larger ones. What you should do is put a large enough capacitor in parallel with the coin cell. ...
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8 votes

How does a battery ( primary cell ) work?

Normally I would say "ignore the electrons" while trying to understand electronics, but this is one of those cases where they actually matter. I'll use a standard alkaline battery as my example. ...
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7 votes

5 year run time on small battery

This was going to be a comment, but I felt it ran too long, so I expanded it a bit more... some of you guys know me by now ;-) This seems like a brilliant opportunity to include some energy harvesting ...
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7 votes

Power supply for battery powered application with precision ADC

You didn't mention any current requirements for you device nor the overall voltage ranges for the balance of your circuit. You may wish to update your question with this information in order for the ...
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6 votes
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EMF transmission from cell phone's battery

That article you linked seems to be of an unqualified source, note that the same "Dr. Mercola" who wrote this is also active in other contra-scientific movements like "vaccines cause autism", "GMOs ...
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6 votes

Replacing 18650 cells in laptop battery with greater capacity ones

Cells in devices that you do not wish to be a flaming ruin MUST have protection. Having protection circuits does not guarantee it will not happen. Cells without protection are intended for use by ...
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6 votes
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5 year run time on small battery

Lithium. Cells made by the Israeli company Tadiran are popular for this sort of application. If I did the math right, it's about 41Ah for the cellular, assuming it runs directly from 3.7V. Not much ...
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6 votes

What can I replace copper with?

What you need to look for is two metals with a large "Galvanic Potential" between them. This is also known as a metals Anodic Index. Copper and Zinc is just one of many options. The following is a ...
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6 votes

What is the meaning of 25C?

C is the rated capacity, which in your case is 5.2Ah. We conventionally drop the hour unit to calculate the current in Cs. 25C is therefore a current of 130A.
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6 votes

Charging a protected 18650 cell

The protection circuitry on a Li technology battery is not a charging profile controller. The protection circuit only tries to protect the battery from over voltage, too deep of discharge and over ...
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6 votes

Why can't electrons move in an open circuit?

I can agree that electrons in wire's side still connected to cathode side(B) can't kove because there is no space so that negative charge at cathode can push. This applies an overly simplified ...
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5 votes

How is wristwatch with 10 years battery life possible?

The key here is that it has no sweep second hand. The minute hand is incrementing only once every 20 seconds and that's the only movement that's occurring to the hands.
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5 votes

How many hours would a 38000 mAh powerbank will last?

As Plasma says in a comment this site is overflowing with calculations about batteries and warnings about power banks (some of which my own posts), I'm in a procrastinatory mood, because I have an ...
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  • 18k
5 votes
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Over current protection for a 1-cell battery

You need to look in the data sheet for the DW01-P. One copy can be found here: https://cdn.sparkfun.com/assets/learn_tutorials/2/5/1/DW01-P_DataSheet_V10.pdf The device senses on the CS pin using a ...
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5 votes

Power supply for battery powered application with precision ADC

You may switch on and off periodically your step-up converter. Switch on to charge a big buffer capacitor, switch off to measure. Inserting a low noise LDO is recommended.
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5 votes

Someone tell me if my concept is clear about voltage?

1.5 V is a measure of electrical potential. It is not energy, so electrical potential energy doesn't make sense. One way to look at EMF is the potential of charge to do work. 3 Coulombs at a ...
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5 votes
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Why 3 wire CMOS coin battery?

The extra terminal would allow the CPU to sense if such a battery is plugged into the connector. I don't know if that's what it's used for, but that would make some sense. Alternatively, perhaps the ...
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5 votes
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Re-usability of a used "pencil" (AA, or AAA) battery

Yes, you are missing something. Depending on how you used it the battery might still have most of it's charge left or it might be almost depleted. When a battery with a nominal voltage of 1.5 V ...
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5 votes

Dead laptop batteries

I am answering here because others might look up the subject. Mixing old and new batteries is false economy. You are likely to find one of the remaining 5 batteries to fail soon. The phrase "...
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