97 votes
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Duracell PowerCheck - How Does It Work?

According to the German Duracell website: As you press the points, a current will flow through a metal strip getting warm. The display is a thermochromatic one. So the increased temperature will ...
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  • 16.4k
26 votes

Is temperature the only battery charging speed limitation?

Can I charge as fast as I want, provided that I cool down sufficiently? No. To charge faster you need higher voltage to overcome internal resistance. If the voltage is too high it may cause damage ...
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22 votes
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Is temperature the only battery charging speed limitation?

You certainly cannot charge as fast as you want, but you can indeed increase the charging rate if you keep cooling the battery in the process. Though the point is not to make the battery colder than ...
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18 votes

A battery is not connected to anything. Is there a voltage between its plus and minus poles?

The electro-chemical reactions inside the battery happen only when there's a closed circuit. For an ideal battery, this is true. However, all batteries have some, hopefully very small, leakage ...
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15 votes
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Why does the voltage of vinegar batteries in series not equal the sum of the individual voltages?

As well as demonstrating some basic electricity generation you will be demonstrating why we don't generate commercial electricity using NZ coinage and vinegar! simulate this circuit – Schematic ...
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15 votes

Batteries in Series

If you connect the 39 + 3 batteries to a load and that load is connected for a longish time you might find that the higher ampere-hour batteries are still running OK and trying to push current to the ...
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  • 385k
12 votes

Is temperature the only battery charging speed limitation?

A lot of the chemical limitations to which speeds you can charge or discharge a battery actually get worse with decreasing temperature. For example: the charge carrier mobility in a cold battery will ...
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12 votes
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Allowable reverse current into Alkaline battery

Self-discharge of a 9V alkaline with a 20% down shelf life of 5 years and 500mAh capacity is about 2uA, so I don't think that <2uA is any kind of a possible problem. There is no net charging taking ...
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11 votes

Why does the voltage of vinegar batteries in series not equal the sum of the individual voltages?

When any battery is connected to a load its output voltage will drop a bit due to the internal resistance of the battery. If you are constructing a battery then there are four simple things you can ...
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  • 9,783
11 votes

Why are these capacitors treated as if they are in series? Why must the incoming and outgoing current in a battery always be equal?

Unless this circuit is being operated with a voltage source with frequency in the megahertz or more, there's not much point in analysing what happens to actual charges here. You can rely on Kirchhoff'...
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  • 8,348
8 votes

Is temperature the only battery charging speed limitation?

If you charge too fast, then because the heat transfer is not instantaneous the plates buckle due to thermal expansion and create localised « shorts » which can then cause catastrophic failure. And ...
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  • 5,204
7 votes

Is it safe to discharge Li-Ion to 0V?

Storing them "discharged" to ~3V with the device they were used in still preserves lots of energy in the battery. At 3V a Li-ion battery has almost no capacity left. In this graph two 800mAh ...
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7 votes

Why are lithium-ion batteries typically used if they’re so flammable?

Li-ion is primarily chosen for higher energy density (by weight and volume), but also for higher power, higher voltage, more flexible form factor, cheaper and easier manufacture, more efficient ...
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7 votes

Why are(n't) rechargeable batteries damaged by partial charging?

The three statements you quote are all about correct. What's good for a battery heavily depends on the type (chemistry) of the battery. In the old days, earlier than 10-15 years ago, the majority of ...
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  • 3,775
7 votes

Are lithium ion batteries damaged by strong magnets?

It should not have an affect on the battery, the magnetic field my deviate the path of ions and electrons slightly but not have any effects on the battery itself. If the magnets 'slam' into the ...
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6 votes
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what is the Outer casing of alkaline battery made of?

The cathode end is connected to the outer can of the battery (not the plastic casing but the metal directly under it), it's all one piece that is separated from the anode on the anode end. There is ...
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  • 985
6 votes
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Deciding on lithium battery chemistry, lithium ion (protected) or Lithium Iron Phosphate (no protection) Safety is critical

Let's start with a very important point: With Lithium based batteries a thermistor is a nice last line of defence, but you seem to be making it the centre point of your thoughts. If your thermistor ...
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  • 18k
6 votes

A battery is not connected to anything. Is there a voltage between its plus and minus poles?

Without the current loop there's a balance state generated inside the battery. As much electrons have taken the new places in the forming new compound as possible before the generated internal charge ...
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  • 21.4k
6 votes

A battery is not connected to anything. Is there a voltage between its plus and minus poles?

The chemical reactions inside the battery cause opposite charges to build up on the terminals. The buildup of opposite charges creates a voltage difference between the terminals, whether the batter is ...
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6 votes
Accepted

Safe Continuous Discharge Rate of a Car Battery

Your Varta battery is a Sealed Lead Acid, AGM type. I could not find useful information on Varta's website, so I will refer to other manufacturers that provided data. I tried to find from YUASA brand, ...
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  • 745
6 votes

Why are these capacitors treated as if they are in series? Why must the incoming and outgoing current in a battery always be equal?

This is a model, or ideal circuit, that is a useful approximation (in many cases) to a real world circuit. If we wanted to use a circuit model to take account of the charges on the surfaces of the ...
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  • 142k
5 votes

custom battery for CO2 generation

Plant a lemon tree - this will cover CO2 generation. You will also get some oxygen, shade, and other useful stuff. Don't ever burn any part of the tree or you may get CO. AS far as LED goes, wait ...
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  • 3,221
5 votes

Battery discharge current

If you look at the graphs for performance you will see that best cell capacity for various loads implies a minimum load resistance of about 3 kohm. Much lower than this and cell capacity drops from ...
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  • 385k
5 votes
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Is a battery's internal resistance a function of integrated current over time?

A cell is a bunch of chemicals between two electrodes. A chemical reaction produces an excess of electrons on one terminal, and a lack of electrons on the other. Once the potential difference ...
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5 votes

How can I calculate Ampere Per Hour if Intensity has been given

Ah means ampere-hour, not ampere per hour (otherwise the battery would last forever). But your calculation is correct, the battery has enough capacity for delivering 2.15 ampere (for one hour), so if ...
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5 votes

Is Non-Passive Cooling bad for Lithium Ion Cells?

Your concern is somewhat misplaced. At 1 A charge-discharge, normal 18650 Li-Ion batteries do not heat up. Consider that normal battery heats up only due to Joule dissipation over ESR, and the ESR of ...
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  • 37.4k
5 votes
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laptop batteries charging myths - Long life OR short life

The best report on this subject https://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries The lowest aging rate is known to be 0'C 66% SoC which is the approx. SoC charge ...
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5 votes
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Why are lithium-ion batteries stored at 50% voltage and not a lower voltage?

I've always assumed that the lower the voltage, the less material degradation, but that starting a storage cycle with a voltage too low runs the risk of dropping the voltage to a point where the ...
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5 votes
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Mixing NiMH and Li-Ion

As a general rule, it is not adviseable to mix batteries' or cells' chemistries. (edited after a comment) And any kind of mixing should be avoided: don't mix cells of same chemistry, but different ...
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