Questions tagged [battery-chemistry]

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57
votes
1answer
20k views

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 ...
26
votes
3answers
5k views

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 ...
24
votes
4answers
28k views

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 ...
17
votes
4answers
5k views

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 ...
13
votes
4answers
11k views

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 ...
11
votes
3answers
3k views

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 ...
10
votes
4answers
2k views

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 ...
9
votes
7answers
3k views

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 ...
9
votes
1answer
2k views

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 ...
9
votes
2answers
375 views

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 ...
9
votes
2answers
166 views

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: ...
6
votes
2answers
896 views

Batteries in Series

i have 39 batteries of 33Ah 12V connected in series, i need to add 3 more batteries. may i add 3 more batteries of 40Ah 12V in same series? what will happen technically? kindly advise.
6
votes
2answers
581 views

Is Non-Passive Cooling bad for Lithium Ion Cells?

I'm in the process of designing a device capable of charging, discharging and testing internal resistance of 18650 cells. My device will be capable of testing 100x 18650 at the same time, each will ...
6
votes
1answer
4k views

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 ...
6
votes
1answer
2k views

If I turn a AA around will it drain or damage electronics?

I have an Apple Bluetooth keyboard. The thing turns on all the time when I put it in my backpack. This is bad because it blocks the soft keyboard on my phone. It runs on 2 AA batteries. Lately, I ...
5
votes
3answers
1k views

Why does connecting batteries in series result in doubled current sourcing while shorting?

I have Duracell Ultra Power AAA batteries, current draw is around 2.5A when shorting for single unit. I have just tried connecting them in series and parallel then measure discharge current. ...
5
votes
2answers
6k views

what is the Outer casing of alkaline battery made of?

what is the outer casing of a typical small 9v alkaline battery made of? Is it conductive?
5
votes
1answer
1k views

Why battery charge C rating is usually lower than discharge

Why most (or all?) batteries can be discharged at an higher C rating than the charging C rating? For example I have the following battery for my quad-copter: https://hobbyking.com/en_us/turnigy-...
4
votes
2answers
293 views

Electrons' flow misconception?

Conductors have a single electron in the last band, these electrons get pushed forward by electrons coming from the source (Battery), each electron pushes its neighbor and so on. Current is the flow ...
4
votes
1answer
158 views

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

Over the years, I've come across websites and people with different opinions on the "correct" way to charge rechargeable batteries (I'm more concerned with laptop, tablet and phone batteries than with ...
4
votes
1answer
2k views

Are lithium ion batteries damaged by strong magnets?

I'm wondering if it is okay to put a lithium ion battery directly next to a strong permanent magnet. Would this affect the functioning of the battery? Can it lead to early failure? In the worst ...
4
votes
2answers
2k views

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 ...
4
votes
2answers
289 views

Why do batteries have a short lifetime despite having no moving parts?

Chemical batteries do not seem to have any moving parts, but seem to have a rather short lifetime anyway. Why is this? The only reason I can think of is electrolyte leaking, but I have never noticed a ...
4
votes
1answer
3k views

TP4056 heating very badly

I’m charging a Li-ion 3.7 V, 3500 mAh using a TP4056 charge controller IC and feeding a 6 V, 9 W monocrystalline solar panel to charge it. When I connect the solar panel at good sun light at 2 PM in ...
4
votes
1answer
412 views

The voltage of capacitor across battery never reaches battery voltage

I made some homemade vinegar batteries. The voltage of each cell was measured around 0.45V. I have 18 of them in series and I measured around 6.5V for the whole chain. Since the vinegar batteries ...
3
votes
1answer
2k views

Is a battery's internal resistance a function of integrated current over time?

I've got a question regarding the internal resistance of a CR2032 coin cell. Here's some background info on the project I'm working on: I'm working on an electronics project in which I hope to have ...
3
votes
2answers
144 views

Mixing NiMH and Li-Ion

I have a toy that works with 3 AA Batteries in series. I switched to NiMH batteries but my voltage is less now. Do you think that the middle Battery in the series can be swapped to a 14500 Li-ion? ...
3
votes
1answer
2k views

Do brand new rechargeable batteries have a charge?

When a standard Duracell AA battery is manufactured, it contains all the charge it will ever have (right?), and can't be recharged. But, for a rechargeable battery like a NiCd AA battery, or a ...
3
votes
2answers
667 views

Li-ion Battery Rejuvenation

What can be done to repair or restore an ageing/dead/failing Li-ion rechargeable battery? As they get older; they typically, gradually lose their capacity to hold a charge. What physical and/or ...
3
votes
1answer
164 views

What makes primary batteries leak on very deep discharge?

From my experience, if a primary (alkaline or zink) battery is left in a device with very low consumption (like a remote control, or a quartz watch) then at some point all the energy is drained and ...
3
votes
1answer
109 views

What is the longest lasting (number of years or cycles) commercially available battery technology?

I'm asking this question because I felt that an answer would be useful to myself, and anyone else who might design a portable or other battery powered system that is meant to last several decades ...
3
votes
1answer
120 views

How does the charging curve of a deep-cycle lead-acid battery change as it degrades?

I am designing a circuit inside a UPS that periodically tests how long the battery can power the load. It does this by breifly disconnecting the power from the UPS and extrapolating from the measured ...
3
votes
3answers
727 views

Why do lead-acid batteries fail after about five years of operation?

I had some time ago a failure in the batteries of my UPS. The UPS periodically performs a self-test of the battery, and it failed, causing all the computers behind the UPS to shut down. The batteries ...
3
votes
1answer
78 views

Is the carbon-zinc battery that I am characterising overloaded? Using HPPC

I am trying to characterise a 9 V battery using a pulsed load measurement. The battery is a 9 V zinc-carbon eveready super heavy duty. The load is a controllable constant current source. When I ...
3
votes
2answers
238 views

How does a laptop maintain battery at full?

I know how a laptop battery becomes charged, however, I am not so sure how the power is maintained when when the battery has been charged to the maximum. I am unsure whether the laptop would switch ...
2
votes
2answers
180 views

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

It’s no secret that lithium-ion batteries are volatile - just look at hoverboards, Samsung Galaxy Note 7’s, and even some iPhone models which have exploded. Granted that these are not so common ...
2
votes
2answers
318 views

laptop batteries charging myths - Long life OR short life

I'm very conscious about the life of battery. Some people say that don't keep plugged-in laptop all over the time and remove battery charging at 70% and again charge at 40% so your battery cells ...
2
votes
2answers
378 views

Alkaline cells vs. LED flashlight

I have (had, actually) an El Cheapo pocket LED flashlight powered by 3 AAA cells. It was shipped with very low quality "salt" cells (regular, low weight - someone please suggest a proper English name ...
2
votes
2answers
206 views

What is an “Ni-Cr” battery?

I have encountered a few references to Ni-Cr batteries, such as a Charger for NiMH and Ni-Cr batteries. I think it may be a synonym for NiCd. If you can shed any light on this, it would be most ...
2
votes
2answers
1k views

Slightly bloated LiPo; still save?

I am using lithium polymer batteries without much internal protection, as is common in RC planes and such (weight constraints). I have noticed that some of the older ones feel like they built up some ...
2
votes
1answer
149 views

Is there an easy way to protect a PCB from leaked electrolyte?

I've come across a LED flashlight that has rather curious design. The flashlight is rather powerful - it can notably heat up in "turbo" mode and so the driver definitely deals with some serious ...
2
votes
1answer
267 views

Can a lead-acid battery charger be used for “Gel” type?

I have a PB-600-24 lead acid battery charger. Can I use it for the battery type that has an image as below? 4 of the batteries are in series.
2
votes
1answer
561 views

Is it safe to charge single 18650 cells without temperature sensing?

I was looking at 'power bank' circuit boards on Aliexpress, the kind that you add to a 18650 cell to make a basic 5V in/out supply. I noticed they all seemed to be lacking any kind of temperature ...
2
votes
1answer
184 views

What are different battery capacity algorithms used? [closed]

I need to implement an algorithm to know the capacity of a battery. I don't want to use any external gauges which are available on the market. Can you suggest which algorithm(s) is/are popular? Can ...
2
votes
1answer
139 views

Discharge Behavior of a Battery

I am working with a zinc air battery (emf 1.3 V). I have plugged a resistance of 100 ohm to this battery and I have recorded the voltage at the battery. When the circuit is opened, the voltage is 0. ...
2
votes
1answer
88 views

at what temperature does it become expeditious to use a lithium battery's charge to heat itself?

battery capacity diminishes the colder the battery gets. Is there a point where it's worth using the battery's energy to warm it up, increasing capacity? If so, where's the break-even point? If not, ...
2
votes
2answers
390 views

Best value Lithium ion/polymer cells/batteries

I've built a sound reactive, android controlled, wearable RGB LED matrix/suit which I'm currently powering with a rather heavy 12V 3Ah SLA battery. I'm looking to switch to lithium or ni-mh packs and ...
2
votes
1answer
91 views

Does the positive pole of an an electrolytic capacitor act as a cathode when discharging?

As far as I know, the anode of a polarized device is defined as the location where the oxidation occurs. For a galvanic cell, this means that it corresponds to the negative pole, while for an ...
2
votes
3answers
58 views

Protecting components from catastrophic age-related battery failure

As someone who does a lot of restoration work on old electronic devices of all kinds, finding old, leaking batteries well beyond their use-by date is common. Finding that the battery leak has ...
2
votes
0answers
25 views

How do bluetooth headsets handle 2C charging current?

I have used a few of those bluetooth headsets that are wireless stereo (TWS) ones and are charged by a case in which you insert them. I haven't used expensive ones, just rebranded chinese ones. All of ...