Engineering Stack Exchange
Engineering Stack Exchange

Questions tagged [battery]

108 questions
12
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1 answer

What causes rechargeable batteries to age? What can be done to extend life of these batteries?

These days most of modern electronics use rechargeable batteries as a power source. Also, these days most modern rechargeable batteries are Lithium Ion or Lithium Polymer based. Like any other devices, over time these rechargeable batteries lose the…
Mahendra Gunawardena
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7
votes
4 answers

Charging a smartphone battery while using it

While this question pertains to smartphone , it is being asked from purely an electrical engineering view (My electrical knowledge is very basic) Trying to understand if charging a cell phone and using it is recommended or not, I came across this…
beeshyams
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6
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1 answer

In the Apollo 13 mission, how could the batteries have "no Volts" with two Amps of current?

In the movie Apollo 13 there's a scene when the LEM is losing power; when they switch the module on, one of the astronauts reads the levels and says that one battery has no Volts but 2 Amps. What did he mean?
user6396
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6
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3 answers

Why do modern diesel electric submarines predominantly use lead acid batteries?

I have always wondered why the diesel electric submarine industry has not kept pace with the consumer market for high power/energy density batteries. We have seen a historical transition from lead acid, to nickel-metal hydride, to lithium ion…
Alex Popescu
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6
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3 answers

How to prevent shorts between exposed battery terminals and racing vehicle chassis

I have a small issue that is causing a lot of problems. I'm on a Formula SAE team and our battery is consistently shorting between our positive terminal and our chassis. Our chassis is the grounding point. Our battery is underneath our seat, our…
Adam
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5
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4 answers

Why do rechargeable Lithium Ion & Lithium Polymer batteries explode or catch fire?

There are many Lithium Ion and Lithium Polymer rechargeable battery related accidents. Are some of these accidents are battery design related? Are some of them misuse of rechargeable batteries. What is the chemical composition of Lithium Ion and…
Mahendra Gunawardena
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4
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2 answers

What are the consequencies of intermittently charging a smartphone battery?

I would like to build a little water mill to place under the sink of the kitchen to produce electricity. Considering that the mill will work when the user opens the tap to wash a dish, using a dynamo and a little electric circuit (bridge rectifier…
wibix
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4
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1 answer

What is the minimum current required to charge a smartphone battery?

I am planning to make a portable charger for my smartphone. My input current is 300 milliamps and I am not sure if that will be enough to charge my phone's battery. What is the minimum current required to charge a typical smartphone battery?
user2338
4
votes
1 answer

Simultaneously charging and transmitting data to an android phone using usb

Dear engineers, I have to make an engineering project which is a portable solar phone charger. One thing I need to do in it is to somehow charge the phone (android) from the battery (which is charged by solar panels) and simultaneously send data…
Uzzernaim
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3
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Is there fire suppression in some phone batteries, and if so, how does it work?

I recently saw a rugged smartphone, three or four years old, with a ~5000 mAh battery, suffer a major impact to its back. This wasn't a fall, it was a fast impact with a heavy object. Immediately there was this loud hissing sound, and clouds of what…
Jonathan Brickman of Topeka KS
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3
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2 answers

Battery Swapping in Electric Cars

What are the advantages and disadvantages (technical, financial etc.) of having battery swapping system over charging stations for electric cars? As per my reading, battery swapping seems feasible for electric buses and 2-wheelers but not for cars.…
user16060
2
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0 answers

Are two solars panels more efficient than only one of twice the power output?

Is there any advantage to use two 50 W solar panels in parallels instead of one 100 W panel? As we know, the effect of partial shadow on a solar panel can make the whole panel ineffective. We want to mitigate this effect by doubling the panels so…
Charles
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2
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1 answer

Why do most lithium batteries have 4 terminals?

Most consumer devices that have lithium single-cell batteries have 4 connections. I've noticed the following diverse types of devices, this is true: Samsung smartphone with removable battery GoPro camera Laser barcode scanners Nikon DSLR…
BetterSense
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2
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AGM battery float voltage

It is a fact that AGM batteries are typically charged with higher voltages, compared to the other lead-acid batteries (flooded and GEL). I don't understand the reason for this, is it related to the cell manufacturing? (Since the chemical reactions…
Federico Toso
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2
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2 answers

How is it possible that "fiddling around with" batteries can apparently give them more power?

I have a flashlight which I use when I have to get up in the night in the pitch-black room. It takes three AAA batteries. Recently, it has been rather dim, so I assumed that I would have to switch batteries soon. First, I took the current batteries…
Doran
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