Questions tagged [battery-chemistry]
The battery-chemistry tag has no usage guidance, but it has a tag wiki.
210
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Can I use a MAX17262 to measure battery capacity of a 300mA 3.7V Lipo?
First, I a very basic understanding of lithium based batteries and from what I have learned, gauging their capacity can be quite complex. I was looking into MAX17262 as a fuel gauge to measure the ...
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Is it possible to measure state of health momentaneously on LTC (Li-SOCl2) batteries mid lifetime?
I'm developing a product that uses LTC Li-SOCl2 batteries, a D-cell bobbin type.
I would very much like to be able to take an unclear battery from my desk or some old/demo device and get an idea of ...
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Drop in charging current, could it be an issue in the long run?
Recently, I've noticed a slight decrease in charging current for my 8s LiFePO4 battery after around 7 charge cycles. The charger used to deliver 1.48A, but now it charges at around 1.45A. I'm ...
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Detect battery type (NiMH, 14500, alkaline) and only charge the rechargable types
I'm building a flashlight that uses AA size batteries. I want to automatically detect the battery type and charge it with the appropiate method, and also detect alkaline cells so it won't try to ...
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Are lithium-ion battery cells' maximum discharge ratings based on heat?
For any given lithium-ion battery cell, would I be able to discharge more than its rated maximum discharge value provided that it's for a brief time and/or the heat does not rise up and be sustained ...
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Why do battery cells fail in groups?
I have been observing for a long time that battery cells seem to fail in groups that are in close proximity.
I agree that observing 3 cells in a flash-light is not a very ample set, but I recently had ...
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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 ...
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Why do car jump starter packs often use lithium cobalt oxide batteries?
I have looked at car jump starter packs and found something peculiar. Almost all of them are three lithium cobalt oxide cells in a series.
This seems odd to me. I have understood that lithium cobalt ...
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Identify battery chemistry
I have a small project where I would like to use a single 18650 LiFePO4 battery. Problem is that they are somewhat difficult to procure in very small quantities around where I currently live (Japan). ...
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Bypassing a 17S lithium battery pack, can I use 17S BMS with a 16S battery pack?
I have 60 V lithium battery with 17 series.
In this one series damaged.
I bypassed the damaged series and tried using the same 17S BMS (by ignoring the last wire).
But it didn't work.
Looks the BMS ...
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LiFePO4 battery capacity, influence of temperature
The main question is, if Lithium Iron Phosphate batteries are regaining capacity when heated up.
Assume:
a nominal 3000mAh 3.2V cell @ 25°C
capacity at -20°C taken from datasheet is 1500mAh
battery ...
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Mixing old and new Li-ion batteries in parallel: long term effects?
I have four lithium-ion APC batteries. They are all from the same facility and their condition seems to be alright.
I'd like to connect all of them together in parallel, but my question is this: Will ...
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Safest battery for harsh conditions
I have a bunch of plants on my balcony and I would like to automate the watering.
I don't want to drill holes in my window frames so I can't provide power from within my apartment.
I'd like to have a ...
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Why is my lead acid battery suddenly dead?
I have a 12v 12ah sealed lead acid battery that was used 3 years in a battery friendly environment. Now I wanted to use it to power a security camera.
I use a cv cc buck converter as a charger. I ...
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DC current measurement in a battery cell
I want to apply a fixed voltage (around 1.1V) to an electrochemical battery cell in order to remove some oxygen from it due to parasite processes that affects the battery operation.
At the same time, ...
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If you mix the anode and cathode in a electrolyte solution you will have a short-circuit?
So, I just saw this video a person makes a rechargeable copper-zinc battery in an epsom salt electrolyte solution where the zinc and copper are two metal plates.
If you, for some reason, took copper ...
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How to make a copper/zinc penny battery rechargeable?
I just saw the copper+zinc+vinegar battery also known as "penny battery" and I thought it would be perfect to make at home since I don't know anything about chemistry.
On the Wikipedia page ...
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Charging 18650 li-ion cells with higher voltage than 4.2V
I'm charging my Samsung INR-18650-30Q with a lab PSU with the current limited to 3A and the PSU voltage set to 4.7V. I'm also measuring the voltage directly at the cells, and that meter is showing 3....
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What is the maximum pulse current from a watch battery?
I know that a comprehensive answer probably spans 1-2 orders of magnitude. Reasons include different battery sizes, chemistry, etc.
I can't access a lab at the moment or I would just measure it.
I ...
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Does battery chemistry matter for state of charge determination (discharge only)?
Someone in a chat was discussing this and I am curious.
If I have a fuel gauge that explicitly states a certain chemistry and I use another chemistry is that ok ? For instance, the part below, is for ...
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DIY lead acid battery
I need a battery to act as capacitor for a small generator (~7V peak) which does not produce smooth DC. Normal capacitors are unable to deal with ~0.2 second dead time when load is attached, lithium ...
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Voltaic pile: question on components
I have some questions on voltaic pile components.
The following show images of the voltaic pile. The vertical pile in I1 has four outside (labeled m in Fig 2) bars and one bar in the center ...
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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 ...
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What are the possible reason for swelling a coin battery?
A CR2032 lithium battery is powering a Bluetooth LE based smart device. During the long-hours- continuous-testing, the battery in some test pieces got swollen. The heat is controlled max 80°C. Battery ...
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Li-ion End of life
What will be the reason for reduced capacity of Li-ion cell at End of life? What will be the nature of voltage at EOL with respect to BOL? Will it be still reaching something like 3.65 or 3.7?
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Best way to measure microvolt potentials in an electrolyte solution?
I wish to measure microvolt-level fluctuations in a small volume of electrolyte solution, currently saltwater. My existing setup works but has some strange data so I'm hoping someone with more ...
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Battery-like energy storage device made of assorted batteries?
I don't know what search terms to use. I'm also extremely ignorant with respect to EE.
I'd like to build a battery bank made of parts I found on the side of the road. I know different batteries can ...
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186
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Manually balancing Li-ion battery pack
I have a battery pack which is currently 13 series and 3 paralell.
Cells are Lithuim Ion.
I want to make it into 16 series and 4 paralell.
As far as i know it's a very good idea to make the old cells ...
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Safe Continuous Discharge Rate of a Car Battery
I have a car battery (Varta Silver Line of Products) that's rated at 110Ah, and 900A Cold Cranking Amps.
The marketing of the battery from different sources says "huge reserve capacity" but ...
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How to calibrate coulomb counter using the open circuit voltage method? (Estimating battery state of charge)
According to u/Krexington_III answer from Reddit, to estimate battery state of charge in a mobile device, such as a cell phone, and do it pretty accurately (and without a need of heavy stuff like a ...
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Will the noise level change with battery chemistry? [closed]
I'm using a 48V motor controller and a 48V battery. When I check the 48V terminal with an oscilloscope, it seems noisy. The battery chemistry is LiFePO4. If I use NMC type battery, can I reduce the ...
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Recharging CR2032 (LiMnO2) battery in a pinch
My digital calipers take a 3V 2032 (coin cell) battery, they currently contain a CR2032 (lithium manganese dioxide). It's on the very low end of remaining charge, I have no spares, and no easy way to ...
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Why are(n't) rechargeable batteries damaged by partial charging (additions)?
I've read Why are(n't) rechargeable batteries damaged by partial charging? and main source quoted batteryuniversity. I found the article having deficiencies and looking to find more "accurate&...
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Lead acid battery: What happens if very low charging current is applied for an extended period?
What would happen to a 40 Ah lead acid battery if the charging current is as low as 750 mA?
Would it get charged to its full capacity, say from 12 V to 12.7 V after a long duration or go permanently ...
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12 V, 7 Ah SLA battery reads 0 (zero) volts
I have a new 12 V, 7 Ah battery which reads 0 (zero) vokts. Let me explain the situation. I have a 800W UPS (for pc) whose battery wasn't giving enough backup. So I decided to replace the battery. I ...
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Charging Batteries: Estimating SOC using a Voltage look up table
I am charging a battery using constant current. This battery can have voltages from 2.5V to 3.6V. I have characterised the battery, as in found the voltage Vs SOC (state of charge) for the battery. ...
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Practical Considerations of using batteries in parallel + parallel Vs series
I have some queries regarding charging/discharging LiFePO4 in parallel:
Initially, when they are first connected, they need to be bough to the same voltage to avoid high currents. Excluding the ...
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How to estimate Li-ion battery health for an unused smartphone? [closed]
I am considering purchasing a new smartphone that is several years old and could use a little electrical engineering help from the EE geniuses here.
I've performed quite a bit of research, and found ...
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2
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Nominal voltage of a battery
How is the nominal voltage of a battery determined?
A NiMH cell's usable voltage ranges between around 1.4-1.0V and the nominal voltage is quite in the middle of that at 1.2V.
Similarly, the nominal ...
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Relationship between plating thickness, surface area, and ampere-hours
I am reading a PDF titled Electrochemistry for the Electronics Industry. I am having a hard time understanding the relationship between metals and the Ah (ampere-hour) relationship.
For the ...
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What will be the steady state Charge distribution of given configuration- battery vs capacitor
I was try to figure it out what should be the charge distribution over the spherical conductor of radius R (in figure below) in following two configurations-
Assumptions
length of wire (l) connecting ...
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Relating Temperature and Battery Performance (HELP)
I am a grade 11 student performing a experiment on relating how external temperature affects the performance of a battery, so its voltage and current change. I've done so much research and cant find a ...
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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 ...
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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 ...
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Electrons flow in Li-ion Battery
I’m new to electricity, and I’ve got a question about electrons flow inside a Li-on battery. A lot of articles and videos show us only Li+ ion flows from anode to cathode through electrolyte during ...
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5
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Battery life calculation - depending voltage levels
I wonder if calculation of battery life depends on its voltage level. Basic calculation of battery life is given below:
Battery Life = Battery Capacity in mAh / Load Current in mAh
However, in this ...
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Refillable battery chemistry
Is there a refillable battery chemistry, where the electrodes are unmodified by the discharge, and when the electrolyte is spent, you just empty it out, and refill with fresh electrolyte?
To me it ...
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Practical Basics of Charging a Battery
I see that this question has been asked many times, but I just wanted to get a better overview, rather than asking about another individual situation.
When selecting a battery charger, what ratings ...
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Protection and charging circuit for LIR2032 or ML2032 battery
I am designing a tiny device with very low power consumption. The device needs a rechargeable battery which should be charged from USB.
I have found LIR2032 and ML2032 batteries that can provide ...
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What type of battery is best to keep in a seldom used flashlight? [closed]
I'd like to keep a flashlight by my bed for home safety. I intend to only use it in emergencies. Since it's for a home safety emergency, I want to keep the battery stored in the flashlight so it's ...
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