Engineering Stack Exchange
Engineering Stack Exchange

Questions tagged [battery]

99 questions
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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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Is it a good idea to intentionally discharge lithium batteries to 80%

Manufacturers recommend keeping lithium batteries between 40 and 80 percent charged. I tried, but sometimes I let my phone get higher than that. Then I try to bring it down soon as possible, either by playing graphic intensive apps or by charging…
user23143
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Are super-batteries theoretically possible?

Is it theoretically possible and/or economically viable to construct batteries capable of supplying an entire city with electricity for a day or two? One of the big problems with power plants of any kind is waste motion. The turbines keep churning,…
Ricky
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Why does the battery life of my iPhone last longer when charged with the USB port of my laptop?

I have an iPhone 12 that's currently at 88% battery capacity. I've noticed that when I charge it through the USB port of my laptop it lasts way longer than when I charge it through my charger. Here's the info on my charger: DC5V / 2.4A Max I…
Dave
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Detection of Li-ion battery

Can anyone explain how Li-ion battery are detected at airport security checking, and would it create any difference if the battery is discharged.
Salvik
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LiPo drone battery first charge voltage rate

Does a LiPo drone battery need a specific voltage rate for the first charge? If so, how much voltage does it need? Thanks.
Frext
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2 answers

lithium-ion battery wear out

Tesla's car batteries keep much of their capacity through 1500 cycles, but Apple's cell phone batteries only allow 500 cycles (300~500 cycles is also consistent with my experience and internet data from other cell phone makers). So, is there some…
bobuhito
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Rechargeable battery engineering: crystal nucleation and rough cut/stamped plate edges

I'm a tech hobbyist, I'm not an engineer, I'm just a IT tech guy that edits Wikipedia and answers tech questions for fun. I am aware that pure solid nanocrystal formation is the primary cause of loss of rechargeable battery storage capacity over…
Dale Mahalko
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lead acid battery discharge process

As an anode loses electrons, the electrolyte will react with the anode producing lead sulfate. Simultaneously, the cathode, receives electrons from the circuit which came from the anode, and will give up electrons to the electrolyte and produce lead…
OMAR
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At what interval should batteries be replaced in a remote controller used for security purposes?

I have a few remote controllers hidden around the house. One is in the bathroom. If the front door busts in and cops scream at me while I'm sitting on the toilet, I can press the button on the controller in order to cut the power to my computer,…
R. Beair
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Can self-discharge cause a Li-ion battery to swell?

Suppose a Li-ion battery, with a polymer electrolyte, is left unused for a few years with no load connected. Can self-discharge alone during this time cause any gassing in the the battery? If yes, can this make the battery physically swollen?
Rich_Dragonfruit_789
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4 answers

How can I measure the amount of voltage stored in a sealed lead-acid battery?

I know that the simple way to measure the voltage stored in a lead-acid battery is to simply measure the positive and negative using a voltmeter. In my case, I think that my battery has a builtin charge controller and it is sealed like the picture…
Cary Bondoc
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Where is the positive terminal on the laser pointer

I want to connect this to wires , I know where the negative terminal is on this ( the spring) but I can’t figure out where the positive terminal is, I can’t find and answer online anywhere else either. It’s a blue laser. Please help
confusionpersonified
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How much of a battery needs to be replaced for it to be a fresh battery?

If I take a battery that is "dead" and completely replace the electrolyte and maybe the terminals, would it be a "fresh" battery? So instead of pulling up to a charging station in your electric car, plugging in, and waiting half an hour or more to…
AndyD273
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Is there any battery that can provide 2 billion coulombs of charge?

What battery can provide 2 billion coulombs?
user262981
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