Questions tagged [cell-battery]

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How to protect single cell Ni-MH battery (overcurrent, undervoltage, overtemperature, etc.) during discharge?

Story I am designing a boost converter for a battery powered board. I am planning to use single Ni-MH battery. The needed output voltage is 3V3. The device will be in deep sleep mode (drawing few ...
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3 votes
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92 views

Blinking fishing lure, best way to save this design?

Background I ordered 10 PCBs with a design for a blinking fishing lure (it's a hobby project.) I have discovered I made a mistake when I designed it and wanted to see if anyone has any ideas how to ...
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2 votes
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120 views

Cell matching by capacity and resistance

When matching li-ion cells in a battery pack how do you use both the cell's resistance AND capacity? I've seen sources mentioning that each parallel group should have about the same capacity, and that ...
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2 votes
1 answer
57 views

Shortcircuit protection using transistors

I'm designing a short-circuit protection circuit for x2 AA battery (3V) and I'd like some tips from the community on how can I make it a low power mode circuit. When V_out is short cirtcuited, the ...
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2 votes
0 answers
69 views

Creating battery pack with biased thermistor resistor network. How to ground if sensing externally

I designed a battery pack board for a customer that uses a multi-cell low-side (NMOS) protection IC. The protection includes OV, UV, OC, and OT/UT protection for the pack. The Overtemp and Undertemp ...
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2 votes
0 answers
53 views

Electric skateboard ESC and homemade battery pack

I am building an electric skateboard and it requires an 80A ESC and 22.2V Li-po battery to run. I found a video where a guy connected a bunch of 18650 Lithium Ion cells in series to form an equivalent ...
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2 votes
1 answer
174 views

voltage fluctuation observed in two parallel Li-socl2 battery

Application: our device working is like it wake up 5 times a day wake up period is nearly 30 sec and during this time take measurement from sensor and send data on zigbee and go to sleep.active mode ...
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1 vote
1 answer
61 views

Use multiple board Arduino to read cell voltage batteries series

As title, I have 3 batteries connected in series composed by 7 cell each. I have several Arduino nano and I want to use one on each battery pack to measure all cells voltage. Then they will be queried ...
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1 vote
1 answer
168 views

18650 Cell boost converter to 4.8v (not 5v)

I have a torch in which 3 AAA cells are put in (1.6 (new AAA) * 3 =4.8v). The problem is these are not long lasting and i have to change them after few days. What i am looking for is a rechargeable ...
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1 vote
0 answers
76 views

Why Protons travel through the membrance but electrons travel through the wire?

In the case of having two electrodes (anode and cathode). I will always hear that positive ions will jump from one electrode to the other causing the electricity to flow the wire. How come only ...
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1 vote
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40 views

How to control the potential in multiple-electrodes (3 or more) in electrochemical cells?

Usually, in most cell designs, the concept of two-electrode design is the baseline. The two electrodes are anode and cathode where the electron transfer happens between them. However, I have been ...
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1 vote
2 answers
111 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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1 vote
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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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1 vote
1 answer
466 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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1 vote
0 answers
73 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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1 vote
1 answer
238 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 ...
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Drawing more current from a battery than what it was designed for

I have built a system that requires at least 8A to run properly. It is powered by 6S1P li-ion battery pack protected by BMS circuit. I did some research and found that maximum battery current output ...
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Microstrip on FPC board

Do anyone know, what is the strange track on FPC board on image below? My guess is, it is something like a microstrip track. The image is for a FPC board, that measure cell voltage of batteries.
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What is most effecient cathode material for fuel cells?

I am a beginner working with fuel cells. In my lab two main cathodes (electrodes) are used : 1- Silver Oxide Ag2O 2- Platinum on Carbon Powder (Air cathode) I would like to upgrade to a better cathode....
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0 votes
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137 views

What can be possible reason for explosion and fire in battery pack built with 3S Li-Ios BMS

I recently made some 12v battery back using regular 3S Li-Ion BMS and 18650 cells. Unfortunately, 3 of them EXPLODED and one even caught fire on site. The BMS I used was almost exactly like this but ...
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1 answer
51 views

Having battery cells in parallel does increase autonomy ? (My load is a constant power load. DC/DC)

I have 4 AA alkaline cells and I'm trying to figure out which is the best cell configuration to achieve maximum autonomy with constant power load. I understand that if your load is a constant current ...
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75 views

Is it okay to double wrap 18650 cells?

I’ve got some salvaged 18650 cells here that I’m looking to sell. Most have perfectly intact wraps/sleeves, but some have small nicks showing bare metal that I’d like to fix. I want to rewrap these ...
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0 votes
0 answers
55 views

Hybrid charger and NVDC charger

I have some questions about the battery chargers. Here are my questions, 1.) Could someone explain the Narrow Voltage DC charger, I try to google it, but I am still very confused. 2.) In what ...
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  • 349
0 votes
1 answer
372 views

Battery Cells Voltage Measurement

I'm using LM324 Q-op amp as a differential amplifier for measuring the voltages of 19-cell battery pack in series which happens to be 1.5 volt for each and the differential amplifier gain ratio is 1:1 ...
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0 votes
0 answers
48 views

Battery made of Li-ion cells assembly

Do you see any issue (feasability, safery, ...) about assembling a battery pack with 10 Li-ion 3.7V 2600mAh cells (put in parallel) having their own individual protection circuits (overcharge and over ...
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0 votes
0 answers
54 views

Parallel light failed to work, one light get's blow other remains good. How to get it working?

I'm using a mobile battery (4V) to power the two (each takes 3.0V) light in parallel since series circuit won't work with one battery. After connecting the wire, for a short time it did work. Then one ...
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0 votes
1 answer
191 views

How can I build a power bank which charges to 16.8V and outputs 12V?

I am working on a battery build project to drive a small 12V electric motor (7A max current draw), and so far I have gotten this far: I will use Li-ion 18650 cells in a 4S6P configuration I will wire ...
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0 votes
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71 views

What's the name of this battery connector?

Been trying to find this "battery bridge" as a spare part to old virtual pets. It's like cell battery connector, but it's individual part connecting two cell batteries (LR44), which has ...
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0 votes
0 answers
28 views

Does Sony NP-F type (generic) batteries have any over discharge protection circuitry inside?

I use these Sony NP-F550 or NP-F570 Li-PO generic batteries (8.4V) for video light and for powering my DIY projects. I've read you shouldn't discharge a 8.4V Li-ion (it's a double 3.7V cell inside the ...
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52 views

stack/ladder n- mosfets

I need to drive n-mosfets to switch on/off resistors in parallel with Lion cells. Each cell+mosfet is in a series - 50 cells. It looks much like a BMS except it NOT a BMS, but a cell test system. See ...
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0 votes
0 answers
422 views

How many 18650 cells in series for 48V Li-Ion pack

I'm looking at the Samsung 35e and trying to build a 48V pack. I'm trying to figure out how many I should put in series to get 48V. I'm assuming I use the nominal voltage to spec that (3.6V/cell)? ...
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0 votes
0 answers
31 views

Enhancement and MPP of a basic Al-air battery with saline electrolyte

I created a simple Al-air battery in oceans using Aluminum and graphite electrodes with ocean water as the electrolyte. There is no electrical separation between the electrodes due to design ...
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0 votes
1 answer
31 views

Is it possible to rapidly bring a cell back to equilibrium after charging/discharging by applying a current flow in the opposite direction?

This is an example electrical model of a generic Li-Ion cell. Image credit- https://www.researchgate.net/publication/260712260_Simultaneous_Fault_Isolation_and_Estimation_of_Lithium-...
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0 votes
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121 views

Connection battery charger IC to battery protection

I'm trying to design a battery charger with protection for 2 cells in series. I'll try to work with this charger: together with this protection IC: Sorry for the dumb question but I'm quite new in ...
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  • 249
0 votes
1 answer
118 views

Cell balancing in BMS

I have questions with respect to cell balancing please help me 1.when this cell balancing will occur is it when charging the battery or when any cell goes more then rated voltage. 2.can you please ...
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0 votes
0 answers
154 views

Powering a RF circuit with CR2032 along a capacitor, pulse currents of 150mA

I am designing a battery powered circuit which performs RF communication. The goal is to use a 3V CR2032 battery. The RF circuit consumes 0.2mA as average current and lowest voltage it can work on is ...
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0 votes
0 answers
48 views

Batteries in series capacity considerations

Let´s say I have a 2 AA 1,5V 1000mAh Alkaline battery cells in series. The circuit it´s connected to consumes 500mA, works at 3V and it´s powered on always, and taking into account other electrical ...
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0 answers
17 views

NiCd 60Ah battery application

What is the application of 1.2v ,60Ah NiCd(pocket type) battery now. Is it still in use in substations?
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0 votes
1 answer
62 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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0 votes
1 answer
55 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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38 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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0 votes
1 answer
125 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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  • 101
0 votes
0 answers
184 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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0 votes
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123 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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0 votes
2 answers
507 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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0 votes
1 answer
33 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 ...
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54 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 ...
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0 votes
1 answer
46 views

Can i use 2*7.4 Lipo to obtain 11.1v

I am a newbie, i have 2*7.4v LiPo, i need 11.1v, can i wire 2 of the charging wires of 1st lipo to another to obtain 11.1v(1S+2S=3S), will it be safe as i have heard that lipo's are less stable.
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-1 votes
1 answer
159 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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-1 votes
1 answer
959 views

Lead-Acid battery connections

In a lead-acid battery we have 6 cells, each cell having positive and negative terminal. The negative terminal of the first cell from the right of the picture connected to the positive terminal for ...
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