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Questions tagged [battery-chemistry]

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Battery life of Li-Po battery if it is under constant charging

This question is to clear my confusion because I cannot find a logical answer. Say a vehicle is installed with a vehicle tracker ...
Awais Saeed's user avatar
0 votes
1 answer
44 views

Battery charging algorithm

I have designed my MPPT battery charger to a state and I have been able to generate the 14.4V charging voltage, with the 40Ah battery charged upto 14.4V during bulk charging stage and absorption mode ...
Peace's user avatar
  • 11
-2 votes
1 answer
114 views

What batteries allow very fast charging times?

I have read that some batteries are able to be charged in 5 minutes. What battery chemistries allows this rate of charging?
Issa Yazigi's user avatar
0 votes
0 answers
89 views

Solution to Parallel Lithium Batteries with same VSUM but huge SOC difference

I have a query regarding charging lithium batteries in parallel. I have attached 3 batteries in parallel set dip switches correctly and connected the com wire to my solar inverter. I did not connect ...
Mansoor Akram's user avatar
1 vote
1 answer
65 views

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 ...
tronhawk's user avatar
  • 217
1 vote
1 answer
101 views

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 ...
Alexander Ohm's user avatar
0 votes
0 answers
18 views

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 ...
Akshat Sharma's user avatar
2 votes
0 answers
105 views

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 ...
AItoothbrush's user avatar
2 votes
1 answer
112 views

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 ...
plu's user avatar
  • 705
2 votes
1 answer
115 views

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 ...
Paulo Ney's user avatar
  • 133
16 votes
9 answers
3k views

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 ...
Theodore's user avatar
  • 2,181
2 votes
1 answer
196 views

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 ...
juhist's user avatar
  • 1,673
1 vote
0 answers
120 views

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). ...
laolux's user avatar
  • 143
0 votes
0 answers
364 views

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 ...
across's user avatar
  • 105
1 vote
0 answers
41 views

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 ...
Jogitech's user avatar
  • 760
1 vote
2 answers
243 views

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 ...
Emmanuel Lopez's user avatar
4 votes
2 answers
111 views

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 ...
Leonti's user avatar
  • 341
3 votes
1 answer
682 views

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 ...
Panthera's user avatar
  • 130
0 votes
1 answer
148 views

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, ...
bardulia's user avatar
  • 407
6 votes
3 answers
1k views

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 ...
contanaopessoal's user avatar
0 votes
3 answers
674 views

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 ...
Fulano's user avatar
  • 360
1 vote
1 answer
261 views

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 ...
James Strieter's user avatar
0 votes
0 answers
28 views

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 ...
Bob Doyle's user avatar
  • 119
2 votes
1 answer
169 views

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 ...
asim's user avatar
  • 600
0 votes
3 answers
209 views

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 ...
Nick's user avatar
  • 383
8 votes
2 answers
2k views

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 ...
Arun Bhardwaj's user avatar
0 votes
2 answers
420 views

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 ...
Vidu Kriss's user avatar
0 votes
2 answers
125 views

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?
No_Name__'s user avatar
2 votes
1 answer
134 views

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 ...
drc's user avatar
  • 123
1 vote
0 answers
80 views

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 ...
Emmanuel Lopez's user avatar
0 votes
0 answers
255 views

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 ...
forferdeilig's user avatar
2 votes
1 answer
3k views

Safe continuous discharge rate of a car battery

I have a car battery (Varta Silver Line of Products) that's rated at 110 Ah, and 900 A cold cranking amps. The marketing of the battery from different sources says "huge reserve capacity" ...
Hans's user avatar
  • 155
1 vote
2 answers
441 views

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 ...
Wiktor Tomanek's user avatar
0 votes
1 answer
120 views

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 ...
Harsha's user avatar
  • 1
0 votes
1 answer
2k views

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 ...
Jason C's user avatar
  • 663
0 votes
2 answers
184 views

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&...
Martian2020's user avatar
1 vote
3 answers
2k views

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 ...
Daniel's user avatar
  • 11
0 votes
1 answer
1k views

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 ...
Omaid_it's user avatar
0 votes
1 answer
572 views

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. ...
fred's user avatar
  • 451
1 vote
1 answer
873 views

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 ...
fred's user avatar
  • 451
1 vote
1 answer
81 views

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 ...
End Antisemitic Hate's user avatar
3 votes
2 answers
3k views

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 ...
Dakkaron's user avatar
  • 879
0 votes
0 answers
461 views

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 ...
Harry 's user avatar
1 vote
1 answer
120 views

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 ...
user215805's user avatar
  • 1,184
-1 votes
1 answer
158 views

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 ...
Kirill Delyukin's user avatar
8 votes
7 answers
6k 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 ...
John's user avatar
  • 469
2 votes
3 answers
86 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 ...
Mikey T.K.'s user avatar
1 vote
2 answers
871 views

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 ...
Vasilly Fedorov's user avatar
2 votes
5 answers
4k views

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 ...
Fırtına Hüseyin GÖKTAŞ's user avatar
0 votes
0 answers
39 views

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 ...
Björn Morén's user avatar

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