Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [battery-chemistry]

produce electricity by chemical reactions of its constituents, i.e., Lithium-Ion, Lead-Acid, and others. Those are commonly called the chemestry of the battery.

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Duracell PowerCheck - How Does It Work?

I've been using these batteries for a long time and I've never seen such a feature. There's a band on its outer wrapping having two ends: The white circle on the left side and the another one on the right side (not visible because it's under my…
Rohat Kılıç
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Why do batteries recover after a load is removed?

I carry a small 2-AA flashlight, and a few times, I have accidentally left it on in my holder. Each time it dies completely, so that no light is emitted, but if I turn it back off and wait for a few minutes, the light works weakly again. The…
Daniel
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What's the highest theoretical energy density for a chemical battery?

This is more a physics/chemistry/nanotech question, but what's the theoretical best energy density you could get out of a chemical battery (or fuel cell), if you could arrange atoms in any manner you wanted? I'm thinking of the nanotech batteries…
endolith
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Is temperature the only battery charging speed limitation?

Charging too quickly can cause the battery to blow up due to heat. But what if I cool the battery down? Can I charge as fast as I want, provided that I cool it down sufficiently? Can I enforce higher charging speeds by increasing the input voltage,…
neverMind9
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What battery chemistry is suitable for a "time capsule" applicaton?

What battery chemistry would be most suitable for an application where the cells are expected to sit a very long time, say 100 years, disconnected, with minimal self discharge? Assume the storage temperature would be something on the order of…
Theodore
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Is it safe to discharge Li-Ion to 0V?

first of all: I know that a completely discharged battery is damaged permanently. I know it experiences irreversible chemical changes. I know it might blow up if you try to charge it. But that's not at all relevant to my question: Is it safe to…
xsrf
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Allowable reverse current into Alkaline battery

Anyone know what happens to alkaline battery if a small current pumped in? For example 0.5uA into a 9V battery alkaline? I want to add a simple 9V battery + rectifier as backup voltage to a 12v circuit. Voltage regulation isn't important, and 9V…
codechimp
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Why does the voltage of vinegar batteries in series not equal the sum of the individual voltages?

I'm working on an in-class demo / hands-on for my sons primary school class, and I've made some small batteries with New Zealand 10 cent (copper coated) coins, and zinc washers, and vinegar soaked cardboard. Each individual cell is measuring about…
Kem Mason
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New alkaline batteries with 10-year shelf life—what's changed?

I'm finding that some new alkaline batteries, such as the new Duracell Duralock and Energizer Power Seal batteries, have a shelf life of 10 years. Most other alkaline batteries have a shelf life of 7 years. How is the chemistry or structure of…
bwDraco
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Looking for a explanation/cause of lithium polymer battery failure

I'm hoping that someone on the EE StackExchange could give me some insight into what is going on with some lithium polymer batteries that I have under test. The question I am trying to answer is: what conditions/causes lead to the type of failure…
RobGah
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Can copper-zinc be substituted for silver-zinc?

Silver-zinc batteries are in the news (the pop science news) these days because they are being researched to compete with lithium ion batteries. But the price is high because silver is expensive. So it got me thinking about copper. Just quoting the…
DrZ214
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Why are these capacitors treated as if they are in series? Why must the incoming and outgoing current in a battery always be equal?

A circuit with three capacitors and an open end at A: I am a high school student. I am very confused by this example. The circuit is open at end "A" as shown but still there would be some surface charges on the capacitor which is not connected in…
Arun Bhardwaj
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A battery is not connected to anything. Is there a voltage between its plus and minus poles?

Here's one mental picture of a battery: The electro-chemical reactions inside the battery happen only when there's a closed circuit. When you place a voltmeter across the poles, then you create a closed circuit (with very low current) - the…
John
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How fast may I trickle charge a full LSD NiMH battery?

I've bought two packages of low-self-discharge nickel-metal hydride AA batteries, each made by a different well-known battery manufacturer. Sadly, the datasheets aren't very detailed: • One datasheet is just a single page long. It says that I should…
unforgettableidSupportsMonica
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Lithium-ion rechargeable battery, shelf life

For Lithium-ion rechargeable batteries, that have never been charged, or been charged like 2-3 times at most, some 2-3 years back, and having since-then been in packaged condition, what should I expect their condition to be ? Reading this wiki…
bdutta74
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