Questions tagged [cell-battery]

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15 views

How can we detect leakage currents and open lines in a lithium ion battery module?

I’m doing ground work on building a bms prototype and I stumbled up on the fact that I know nothing about how to detect open lines and leakage currents. I’ve seen some ASICS doing the part but how ...
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1answer
46 views

Lithium ion Battery

What is the difference between lithium ion battery internal resistance and internal impedance? Are both same, if not which is greater ? How these values will be measured and how they help to analyze ...
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1answer
35 views

If cells in series are mismatched in capacity, will the capacity tend to even out?

A closed question is about cells in parallel, and does have hints about series, but it also has contradictory answers and comments. We have more than a dozen alkaline AA cells, and the only current ...
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2answers
83 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 ...
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36 views

is briefly connecting same voltage/different capacity batteries safe

Ok, so I am working on a project that has two battery packs: a: 7.4v 2Ah - 8 x 3.7v 500mAh b: 7.4v 500mAh - 2 x 3.7v 500mAh These packs will be powering a raspberry pi clone, a handful of servos, ...
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1answer
43 views

is it safe or not to replace my old laptop battery's cells which can increase its Ampere hours from 6600 mah to 13200 mah? [closed]

My old laptop battery's total designed power is 6600 mah and if i replace its cells from Samsung rechargeable cells 3.7V and 2200mah per cell.it will increase battery's power from 6600mAh to 13200 mAh....
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1answer
37 views

How to prevent circuit from shutting down when motor drain too much power

I have a device which has motor and circuits with PLC. This device is connected to a 12v battery which is powering the PLC and motor. Everything is working fine but when the motor's load is heavy, it ...
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1answer
100 views

6v battery low voltage cut-off circuit

I have a circuit that draw 150 ma and i use 6V/4Ah dry cell to supply. Voltage regulator of this circuit needs minimum 8V so I use boost converter to draw the battery voltage to 8 volts.This converter ...
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1answer
47 views

Does 18650 cell voltage sag have a direct relationship with its internal resistance?

When a cell is connected to full load does it drop some of its voltage due to internal resistance and quickly jumps back to normal whenever the load is taken off??
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38 views

Will the BQ2970xx IC do everything I need for Li+ battery protection?

I'm modifying a circuit to use a rechargeable 1S LIR2032 coin cell battery. This is my first time using Li+ and understand I need to add circuitry to protect the battery/circuit. My specs are: Max ...
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1answer
50 views

How to measure dry cell charge level

I'm trying to measure dry cell charge level. I'm using 6V/4Ah/20Hr dry cell battery. In my system there are atmega32a and 6 seven segment display; how can I measure the charge level of this battery?
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1answer
160 views

Building a Huge 18650 Battery Powerbank DIY [closed]

I know there are a lot of threads about this topic already, but I still have some questions about it. Anyways, I am thinking about making a 50-80 thousand mAh power bank depending on the batteries and ...
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1answer
69 views

How bad are 3 degrees Celsius for a lithium battery and electronics?

I have a PCB powered by a lithium battery , it works well inside the house, but when I leave it exposed to low temperatures with humidity the PCB or the battery stops working. I leave the PCB in the ...
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1answer
111 views

Do standard NiMh AA or AAA battery's have any kind of BMS or protection circuit built-in?

Do standard rechargeable NiMh AA or AAA battery's have any kind of protection circuit like over discharge? Or are there any circuits out there that do that kind of stuff? I want to power my Arduino ...
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2answers
227 views

How to efficiently read a battery voltage level with ADC

There is a circuit powered by a battery (3V button cell) and another circuit with a microcontroller (Attiny85 in my case) reading perfectly the battery level (through ADC3 pin) each 5 minutes interval....
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1answer
67 views

how the battery behaves in this diagram

My question is this. I'm using this ic mppt SM72445 along with a 250 watt solar panel, mppt output configured to 50.4 or 51 volts, 12-cell lithium-ion battery pack and bms, if the load is less than ...
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2answers
116 views

how a battery behaves in parallel to the charger with a shared load but with a voltage difference

how the battery behaves in this diagram how a battery behaves in parallel to the charger with a shared load but with a voltage difference
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68 views

Short circuit protection of lithium pouch cells in parallel

I want to put together a battery pack with 2 or 3 lithium pouch cells (for example SLPB11543140H5) in parallel, and a few more in series. Of course they have to have some kind of short circuit ...
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2answers
181 views

Replace 3.7V flat tablet battery with a 18650 cell

I am building a device using cheap Chinese tablet. One of the problems I have is weak built-in battery. I'd like to replace it with a few 18650 cells. As far as I know, 18650 cell can be charged up ...
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2answers
85 views

Switch battery usage off when jack 3.5mm is not inserted

I have an ongoing project where I'm using a condenser microphone to record various stuff, it's powered by a CR2032 battery and the output of the microphone is directed to a TRRS jack connector (3.5mm),...
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3answers
149 views

Peak TX current of LoRa RFM95W

I'm running into some issues powering a test board using a LoRa chip (RFM95W) with a CR2032 battery. I'm well aware of the peak current limitation of such battery and I can see a major voltage drop ...
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1answer
30 views

Thinkpad 420 battery not charging despite of Cells inside are good [closed]

My thinkpad 420 battery is not charging. So far I have done following. Put another battery in my thinkpad and it is charging perfectly. Opened the defective battery and checked all three sets of 2 ...
2
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1answer
312 views

Can I make endless parallel li-ion connections?

I'm looking into building my own li-ion battery pack. I read about linking the cells in parallel and in series, and how to add a BMS. I would like to build a 12V pack with a very large capacity (mAh)....
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52 views

Charging Voltage of Lead Acid Batteries

I recently installed a solar ups and it has been charging the batteries all the time. I have two 12v 230ah Batteries (lead acid tubular) in series and my solar charger software says that it is ...
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1answer
59 views

Battery Protection IC in Series

I want to make a project to protect each individual cells of 16 series battery pack. I have read some data sheets of battery protection IC's such as BQ29209DRBR,S-8261,AP9281 etc. None of them clearly ...
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1answer
344 views

How to measure battery capacity?

I hope this is not off topic. Consider I buy brand new 12V battery. Normally, will be 13.8V when it fully charged. According to the info written in the cover, it capacity is 42Ah. After used for ...
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1answer
133 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, ...
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2answers
716 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). ...
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1answer
100 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 ...
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1answer
64 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 ...
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2answers
90 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 ...
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1answer
410 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 ...
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1answer
71 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. ...
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2answers
505 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 ...
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1answer
151 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 ...
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1answer
32 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 ...
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1answer
113 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 ...
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1answer
31 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 ...
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1answer
151 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 ...
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2answers
166 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,...
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1answer
141 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 ...
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0answers
45 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 ...
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2answers
180 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 ...
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2answers
234 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 ...
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2answers
164 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 ...
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1answer
264 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 ...
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3answers
114 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
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1answer
130 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 ...
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1answer
78 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 ...
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2answers
123 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 ...