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Questions tagged [cell-battery]

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1answer
59 views

Calculate battery discharge time to a certain voltage value [duplicate]

Let's say I have a 14.8V battery with capacity of 5200mAh. My load constantly draws 20 amps from it. I want to estimate the time it takes until the cell reaches let's say 10V. This is just an example, ...
0
votes
2answers
77 views

Charging 8 LiIon 18650 cells in parallel

I'm working on project that is Powered with 8 LiIon batteries/cells connected in parallel. Everything Works fine until batteries run out of "juice". For charging module I decided to use TP4056(@ 1A). ...
0
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0answers
37 views

Building a LiPo battery pack for output 270v DC

so this is related to my other question if anyone wonders. I’m building out a EV battery pack to boost charge a vehicle in real time during heavy duty cycles. The vehicle currently has no external ...
0
votes
1answer
36 views

Battery Management System (BMS)

Suppose that a lithium-ion cell having total charge capacity Q=10Ah is discharged at a rate of 1A for 30min. What is the net change in the cell's state of charge (in percent)? Round to the nearest ...
0
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2answers
75 views

Security/safety circuits in removable cell phone batteries?

It seems like the aftermarket phone battery is so flooded with terrible counterfeits it can't be too hard to trick a phone into thinking a battery is genuine. I'd really like to learn how to use an ...
1
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1answer
54 views

LiFePO4 cells - self-balancing in series or parallel?

I am building various banks / packs from individual prismatic LFP cells, nominal 3.2V each. New and pretty large, 60-400AH. I have a good power supply, charge each cell independently, Bulk stage CC ...
0
votes
1answer
35 views

run ac device on battery [closed]

I recently purchased a radio which unfortunately doesn't have battery option. Its spec is AC 230V - 50/60 Hz and 14 W Is there any way to use my Ni-Mh rechargeable cell battery with this device. ...
0
votes
2answers
72 views

Calculate the Li-ion battery remaining capacity

How can I calculate the remaining capacity (exact or approx value) of a Li-ion battery by measuring its voltage. The battery is connected the load and i know only the battery voltage and the value of ...
0
votes
1answer
98 views

Battery Balancing system [closed]

I am trying to build a Battery balancer system for 16S8P battery pack.It consist of li-on cells(NCR18650PF). I understood how serial balancing is working properly.If serial cells are not equal,an MCU ...
1
vote
1answer
28 views

Increase working hours for an external speaker

I have an external speaker which uses one 18650 cell (3.7V). I would like to increase the working hours by adding one more cell of the same type. I have two questions: Should I add the second cell in ...
0
votes
1answer
51 views

Factors to be considered while replacing dead cells with a new 18650 Li-Ion cell in a Laptop

I am currently using a Lenovo Z50-70 laptop. My battery condition is very poor and it lasts for only 20mins. So I decided to replace the dead cells inside the laptop battery on my own. My Laptop ...
-1
votes
1answer
29 views

Li-ion Modded Powerbank Question

So I got this single Li-ion power bank. It's a 18650, and I wanted to add another 18650 in parallel. I want to use the same circuit which produces a constant 5v. Is it safe to do it that way? in ...
1
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1answer
55 views

How to connect a CR2012 coin cell battery with a PCB?

Im trying to build a flat, battery powered PCB assembly that fits into a small gap of approx. 2mm. I have found the CR2012 coin cell with a thickness of 1.2mm, which would be a good fit in terms of ...
0
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2answers
52 views

In Impedance track algorithm, How is resistance is related to soc(state of charge)?

In impedance algorithm for battery capacity, why we are calculating impedance and why it important to know impedance for SOC(state of charge)? 2.I doing some research on algorithms which we have,so,...
1
vote
1answer
71 views

How to calculate capacity of a battery from the readings of current and time?

The requirement is to compute the capacity of the battery in order to calculate the capacity degradation. The input which can be acquired are current, voltage, relative time, battery level (in terms ...
1
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0answers
34 views

battery life of rechargeable lithium battery

I am trying to determine the life of a lithium rechargeable battery (approximation) before a complete replacement is required. From Panasonic's datasheet, I see that at avg. 10% discharge, it is rated ...
1
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2answers
121 views

Running case fans on D cell batteries

I'm moving into my car and I may need to wire up ventilation that doesn't depend on the engine running. So I found these case fans. However, because I'm not going to be using the car battery, I need a ...
-4
votes
2answers
127 views

Charging 4x 18650 Li-Ion Batteries in series [closed]

Hello StackExchange community. So i have been for a long time wanting to build someything portable and recharchable with the 18650 batteries. the only problem is i cant find any good guide on how to ...
1
vote
2answers
41 views

Can you discharge a 3s LiPo battery from both its main plug and it’s balance plug?

So I’m building a quadcopter, and I want to be able to use the same battery to power both the escs and the flight controller. However, the escs are connected to the PDB which is connected to the ...
0
votes
1answer
66 views

Connecting battery cells in series VS using boost converter

I need a dc output of 12V 60AH through 18650 li-ion battery cells to use with a 1000W AC inverter to power a 650 Watts computer ( each cell 3,7 Volts 3500 mAh ) One way would be make 17 packs in ...
1
vote
3answers
112 views

How to find out which end of a dead battery is the anode, and its voltage [closed]

The battery pack for an old rc car I played with as a kid, has died. Salt crystals everywhere, smells like vinegar. The pack consists of 8 batteries of AA-size connected in series. The red markers ...
3
votes
1answer
116 views

Need help designing an airplane legal battery pack

I know this is not really a technical question but it might also help other people like me who design products with batteries. If it doesn't fit here, then please tell me where I can ask to find a ...
0
votes
1answer
64 views

Button batteries vs 9V headache

I am working on an arduino controller project with a few attached components returning data e.g. gps and mini camera. All works fine with usb power or 9V battery. I tried using button cells in ...
0
votes
2answers
90 views

E-bike battery: upgrade 18650 cells [closed]

I have an e-bike battery of capacity: 4.3Ah (Li-ion). Specifications: http://industrial.panasonic.com/cdbs/www-data/pdf2/ACA4000/ACA4000CE285.pdf For charging, the label on battery says "Rating 25.9V ...
0
votes
1answer
155 views

Max Discharge Rate of typical Alkaline Button Cell Batteries

I have simple circuit that has some led diodes, 3 LR41 batteries and no resistor. By looking at this website, it seems their capacity is about 30mAh. But I couldn't find anywhere the max discharge ...
0
votes
1answer
66 views

Li Ion battery issue (voltage appears and disappears)

I built up a Rspberry Pi self-driving car and everything was fine while I collected data for the Neural Net. After NN finished its training, I want to test the system. At the beginning, everything was ...
1
vote
2answers
93 views

Making a 100 LED Lamp

So I'm still very new to electronics but I would like to make a 100 LED Lamp for fun. I got my hands on a few 18650 batteries yesterday so I decided to do this project. I thought it through but I am ...
-1
votes
1answer
55 views

Can a cell phone battery be used in a power bank at 2A?

Can/will a lithium ion cellphone battery that can be charged at 2 amps safely discharge at 2 amps if used as a power source for a power bank? (Samsung galaxy S4 mini battery in particular) Edit: I ...
0
votes
1answer
54 views

Is the usual model for batteries still valid in the reverse direction?

We all know the usual (simplistic) model for batteries, that is, representing it by a pure constant voltage source in series with its "internal resistance". This is probably sufficiently precise for ...
0
votes
3answers
371 views

Sram battery backup

I don't have an option here in my country , No non-volatile sram and i need it for my project . i designed a circuit for that and need anyone's opinion if it's ok or need a correction .
1
vote
3answers
167 views

Can you build a battery from scratch which is able to make a computer run?

I'm learning about batteries and I'm really fascinated by this topic. I saw some online videos on how to build some "Voltaic Pile - like" batteries with coins and other kind of cells in different ways....
-3
votes
2answers
92 views

Dead laptop batteries [closed]

I disassembled a dead laptop battery and found 6 AA size batteries interconnected. 5 of them still give 1.2V on meter. If I replace the defective one would the pack be usable again and would it keep ...
1
vote
1answer
108 views

Basics of battery charging and discharging [closed]

I am trying to understand batteries. 1) If I have a rechargable battery of 1.2 V 1000mAh, it means I can draw 1A at 1.2 V for one hour and the battery is said to be discharged ? Does "discharged" ...
0
votes
1answer
3k views

Identify the pins of the circuitry that resides within a laptop battery [closed]

My ASUS laptop battery stopped working all of a sudden, when it had no reason to (new). Windows says "Plugged in, charging" , but the battery always stuck at 0%. Before getting a replacement battery,...
0
votes
2answers
64 views

Li-ion battery voltage?

My laptop battery is assembled from 4 cells in series. And the voltage of them all is 16.5V, (on battery it writes 14.8V). Can one cell be faulty even then? Is this a sign that battery is faulty, ...
0
votes
1answer
27 views

Does the charge of a battery affect its discharge voltage or current?

Although I am making an electrochemical battery (1 lead acid cell), I thought that this question would be more suitable here. Would there be any difference in the voltage and current of the cell (when ...
2
votes
1answer
85 views

Re-usability of a used “pencil” (AA, or AAA) battery

If, when tested with my multi-meter, a used 1.5 "pencil" battery is now showing, say 1.2 V and is therefore no longer suitable for the original purpose, can it still have value for some circuit for ...
1
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2answers
363 views

Lenovo Y580 battery - Panasonic NCR18650b MH12210

I am new to the group, so thank you for this great community. I am a student and "DIYer" and like to repair simple electronics. Anyway, so here is my situation: Want to repair my laptop battery as ...
0
votes
1answer
72 views

lithium coin cells, safe to completely cover? lightweight method to protect from the environment

I am trying to make equipment to measure temperature in small mammals, probably attached to a neck collar. The collar needs to be very lightweight (e.g. <3g total) so I am planning to use a ...
1
vote
1answer
324 views

How hot does a lithium-ion phone battery have to be before it explodes?

I have an LG G4, model LG-H810 (serial indicates it's one of the shoddy-soldering ones) and it gets extremely hot during light gaming or while watching videos. It's not too uncommon for me to pick it ...
1
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0answers
32 views

How to protect electrical parts from heating coil

I'm trying to diy an electric lighter with a 3.7v lithium battery, an on\off switch, and a micro lipo usb charger. Already connected the coil and everything works as expected. The only problem I ...
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votes
1answer
42 views

how high a current should flow through a device to destroy it [closed]

I have learnt that cells connected in parallel should be nearly identical in voltage to prevent one cell from destroying the other through high currents. Can anyone explain in depth?
1
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2answers
63 views

Can I replace a cel in a Li-Ion pack with a different cell?

My laptop battery is composed of 6 polymer cells in the constellation: 3 parallel pairs in series. All cells are Coslight CA653495: 3.7V, 2,4Ah. I'm considering replacing one of the cells, which is ...
6
votes
4answers
2k views

How does a battery ( primary cell ) work? [closed]

I'm having an hard time understanding primary cells. There are plenty of videos and explanations about the reactions that happen inside the battery, but you must have a strong background in chemistry ...
0
votes
1answer
28 views

What is the relationship between the current produced fuel cell, the electrodes and the voltage of a fuel cell?

I read somewhere that the bigger the surface area for the redox reductions to take place, and ultimately, the more redox reactions that take place, the more electrons that flow through an external ...
0
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0answers
63 views

How to cater for battery voltage drop when circuit draws current

I have a simple circuit in which LEDs are turned on and off by microcontroller. The circuit is run by cr2032 battery. When LEDs are off, battery voltage is 2.8v and very small current is drawn. But ...
0
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2answers
170 views

Electron flow in Lead Acid Cells in series to make a 12V

I am happy with how electrons flow from the lead negative anode to the lead oxide positive cathode. after chemical reaction at the lead anode where lead sulfate is formed and the electrons are ...
0
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0answers
50 views

How to remove deposit from leaky alkaline cell

I have an LED torch that must have been left turned on when put aside for some time, so one of the AAA alkaline cells in it has leaked and left a white deposit. It is worthwhile trying to recover the ...
1
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1answer
220 views

connecting primary cells in parallel

I want to make a holder for 2S2P(2 series, 2 parallel) non-rechargeable AA cells. Connection should be easy, because there are a lot of 2S1P holders . But I'm worried about the possibility that ...
0
votes
1answer
101 views

Does anyone know this LiFePO4-battery cell? (40138-type?)

My first question on StackExchange - I was not able to find sufficient information anywhere else, so far. I got a bunch (~150) of used Li-Ion battery cells (see picture 1). Chemistry is LiFePO4; cell ...