Questions tagged [lithium-ion]

Questions regarding Li-ion (Lithium-ion) cell and batteries, including proper charging and usage.

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Charging a LiPo using Battery Protection Circuit

I have an application where I power an ESP32 from a LiPo battery. Between the LiPo and the ESP32, I have a DW01A battery protection circuit (data sheet is here: https://hmsemi.com/downfile/DW01A.PDF). ...
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4 answers
88 views

How to get multiple voltages from a single battery?

I have a 12V battery. I want to take 3.3V from it for my ESP32 Microcontroller. I also want to take the remaining voltage (say 8.7V) for my motor driver to drive motors. How can I achieve that ...
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3 votes
5 answers
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Are smartphone cells actually charged with 9V using QC and other techniques or does the smartphone always step down the voltage?

I'm having this disagreement with a good friend of mine regarding charging voltage of the cells inside modern smartphones when quick charge, USB PPS and other techniques are used. Let's take as an ...
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How to simply balance two parallel connected cordless drill 18v batteries?

I am fairly new to battery management systems. I am planing to use two cordless drill 18v battery (5A each) in parallel for an IoT project. For the time being, I've just coupled the batteries through ...
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Is using a non-balance protected lithium-ion battery ok?

I am building a project where I use 4 stepper motors. Since they require a lot of power I am considering using a Lithium-Ion battery for them. This is what I was looking at: https://www.onlybatteries....
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46 views

Charging only the first battery in a series

I have a series of three 3.7v 600mAh LiIon batteries powering a ca. 12v circuit. Currently, a DPDT switch rewires them into a parallel configuration when I charge them–each battery with its own ...
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3 votes
1 answer
187 views

Fully charged battery voltage of devices

What is the voltage value of fully charged (and what is the value of fully discharged, out of curiosity) battery (1s li-ion) in common devices such as smartphone? Of course li ion provide ability to ...
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2 answers
58 views

Charging Power Banks from Electric Car Charging Stations (DIY, LiFePO₄)

Is it possible to charge my own Lithium-Ion Battery Bank from pay-to-use Electric Car charge stations? I’m traveling in an (ICE-powered) caravan. I have a 0.7 kWh Lithium-Ion Battery Bank and a 100 W ...
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1 answer
55 views

Two battery control

I have two Li-ion batteries in my system. (7.4 V 12000 mAh and 7.4 V 2200 mAh; also they have BMS). The larger one of the batteries can be easily removed and installed from my system, so I can charge ...
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3 votes
1 answer
100 views

Why does it take 4-5 hours to charge a small hearing aid? Can a larger NFC coil shorten charging time? [closed]

Oticon makes hearing aids with wireless charging. For one of their models they use a size 13 Lithium-ion battery which corresponds to 270-320mAh. They claim that it takes 4-5 hours to charge this ...
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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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Difficulty in deciding battery requirements. I am using 64 A3144 Hall sensors connected to eight 74HC165 shift registers & 64 WS2812B LED strip

The image is just a basic representation. I am making a college chess project. I was powering all this with my laptop using an Arduino Uno. I plan to introduce a 16*2 LED display and one ISD1820 with ...
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10 votes
3 answers
2k views

Is it okay to charge a deeply discharged Li ion cell below 1V?

I accidentally discharge my lithium cell to 0.45V. Is is okay if I try to revive it by charging with 10mA of current till it reaches 2.5V? cell capacity is 4000mAh.
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TP4056 DW01A Problem

I have TP4056 with protection circuit. In charging, Everything is OK. OC : VDD - VBAT OD : VDD - VBAT While the battery is charging, the circuit continues to work on the battery when the charging ...
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2 votes
2 answers
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Is swapping lion batteries (of same voltage, different capacity) on wireless headset going to affect anything? (charging, etc)

My wireless headset had a 400mAh 3.7V battery in it which was very low quality and ended up lasting very little. So, I replaced it with a 1200mAh 3.7V battery. The 400mAh battery had a protection ...
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Utility engineer trying to understand electric vehicle charging when the car is getting "topped off"

I'm an engineer trying to understand the impact electric vehicles will have on service transformers and other customer facing grid equipment. I'm mainly interested in the energy consumption profiles ...
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How do Li-Ion batteries detect their temperatures?

I know that Li-Ion batteries have specific charging temperature ranges... but how do they detect when they're too hot/cold to charge and prevent the charger from working? Secondary question: a ...
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0 answers
50 views

Trying to alternate power supplies seamlessly when a certain current threshold is hit?

I don't know much about electronics so asking the right questions is troublesome sorry about that. I need to swap from a 1S Li-Ion battery with cylindrical cells 3.8v to a 1S Li-ion battery with pouch ...
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1 vote
2 answers
85 views

Negative cell in Li-ion battery pack [closed]

I have a 6 cell Li-ion battery pack (from a knock-off dyson v6 vacuum battery) which is no longer taking charge. The voltage across the whole pack is 3V. I have opened the pack and measured the ...
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3 votes
1 answer
67 views

Simple wireless charging standard as used in toothbrushes?

I have a project that requires wireless charging of a small hand-held controller with a single 1S lithium-ion cell. People's initial thought was to use the standard Qi mobile phone chargers to save ...
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1 vote
1 answer
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Lithium Ion Cell Precharge

The IC I am using is: STNS01. As I read, charging Lithium ion cells consists of three phases: Precharge ("conditioning" on other articles) phase -> Approximately 10% or 20% of fast charge ...
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1 answer
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Want to charge 24 VDC 600 Ah Li-ion house battery with overflow of 12 VDC 600 Ah AGM battery

I recently installed a 24 V lithium-ion battery and new inverter charger for house power on catamaran but left 12 V AGM batteries connected to separate DC system which also is charged by solar, wind ...
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1 answer
56 views

Battery specifications open or closed condition

Are battery specifications for open circuit or closed circuit conditions? I understand that a battery connected to a load will have a multimeter reading of low voltage, due to the voltage dropped on ...
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32 views

Using an existing MPPT charge controller and solar panels with new battery pack

I have an off-grid setup at the moment to power most of my DC devices (bulb, router, NAS, NVR, etc.) I'm planning to upgrade my setup to a more powerful AC off-grid system to power my entire house. My ...
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0 answers
65 views

Power 5V and 3.3V components from li-ion battery

I want to make a portable device that runs of a rechargeable li-ion (4.2-2.7V) batteries. I have components that run on 3.3V (ATmega328P ,GPS) and some LEDs (5V.) There are multiple ways I can think ...
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1 vote
0 answers
38 views

Practical usage of Automotive BMS with Active Balancing

I work as an intern at one of top semiconductor companies and also in automotive industry. Since I'm assigned to BMS (Battery Management System) team as a concept engineer I'm constantly looking for ...
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2 answers
59 views

What level of imbalance in series connected cells is good?

If I have lithium battery with some cells in series (same type, same manufacturer) - how much could they disbalance after one cycle? How much is too much? If, lets say, I charge 4S pack from 12V to ...
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0 votes
1 answer
35 views

How to charge properly 3S Li-Ion battery pack?

I'm building a 3S 18650 Li-ion battery pack, which will be used for fast charging and discharging. Unfortunately, I can't find a 3S battery charging board that is commercially available. I found out ...
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2 answers
59 views

Can I charge a 4000 mAh Li-po battery with a single TP4056 module?

I bought a single 4000 mAh lithium-polymer battery and connected a step up converter and TP4056 module. I am providing a circuit image; the only difference between the image and the actual circuit is ...
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1 answer
52 views

How fast does a 65 watt charger actually charge the batteries?

My laptop (A thinkpad t440s) has a 6-cell battery: three pairs of 18650 batteries in series, for a total of about 11V. My charger is 65 watts at 20 volts, which works out to 3.25 amps. My question is, ...
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62 views

How to create current limiter to limit phone charging current to 500mA?

I have this neat iPhone case from AudioMod (https://www.audiomod.com/audiomod) that has a built-in headphone jack. I'm looking to upgrade from my 6S to the latest iPhone SE, which is the iPhone 8 ...
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2 votes
1 answer
79 views

Is this TIP102 Darlington Transistor Circuit Correct?

Objective: Power on Pi Zero by setting pin 13 of Arduino to HIGH. I plan on using the Arduino to measure the Li Ion battery voltage and, if well charged (so, say over 4V), then it will pull pin 13 ...
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1 answer
71 views

Are there 18650 cells with 1000+ cycle life? [closed]

Most cells I looked at have 500 cycles (up to 80% initial capacity). A few have 1000. Are there any 18650 (or bigger) with at least 3000 cycles? Or is 18650 somehow now capable of better cycle life ...
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0 answers
95 views

Is there any difference between Li-ion and LiFePo4 BMS

I am recently exploring how to make Lithium Battery packs and trying to build my on my own for Electric Vehicles. I've learnt about both Li-ion and LiFePo4 cells and understood their differences. But ...
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1 answer
74 views

Can I use a BMS to get different voltages?

I am making a 3s2p 18650 battery to make a 12v battery pack for a project I am working on. When I test the various battery cell pads on the BMS I get the expected voltages, 3.7, 7.4, and 12. However, ...
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-3 votes
2 answers
67 views

What is ZCV curve in a lithium ion battery?

What is the relation of impedance, capacity and voltage in a lithium ion battery?
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1 vote
2 answers
114 views

How to design DC bus bars for batteries?

What factors should we consider for designing bus bars for cell terminals? Suppose I have LFP battery pack made up of 9 cells in series each having maximum of 3C discharge rate and a nominal capacity ...
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1 vote
2 answers
51 views

I want to determine the rate of voltage drop of a Lithium-ion battery as it's being discharged at a constant load

We are going to assume the battery pack has a linear charge / discharge curve. There are 4320 cells in the battery. The battery consists of 96 blocks wired in series, with each block comprised of 45 ...
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2 votes
0 answers
87 views

Not satisfied with 2.5 V battery protection shutoff. How to stop discharge at a safer voltage?

I have some of these lithium ion battery charging modules which are very commonly available online. They use a TP4056 charger and a DW01 protection IC. The DW01 datasheet says that it should cut off ...
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-4 votes
1 answer
95 views

Can I charge my laptop with powerbank? [closed]

I have a Lenovo laptop with a L16L2PB3 lithium-ion battery. It has 4610mAh capacity which is enough for 3-4 hours of power. I want to have an ability to charge it when no sockets are around and for ...
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2 votes
1 answer
84 views

BMS Two Stage OP Amp

My company is designing a 4 cell BMS. We recently did a redesign of our cell voltage measurement circuits and are having major issues. The first stage of each amplifier is a differential opamp with ...
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1 vote
2 answers
248 views

Pre-charge Anti Spark MOSFET Switch for Li-ion Battery

I am looking for some advice on the direction of this project, I am a mech eng, who likes to tinker with electronics as a hobby. I want to build a on/off MOSFET switch for a 20s4p li-ion battery pack, ...
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1 vote
1 answer
69 views

What are the differences in procedures in charging lead-acid batteries vs. lithium-ion batteries?

So I thought that lead-acid batteries are preferred, because you would only need to apply the maximum specified voltage (mostly 14.4 V for pure lead-acid and 14.7 V for the AGM/EFB, correct?) and ...
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1 vote
1 answer
43 views

18650 Li-ion cell protection tripping at super low currents (~1 mA)

I recently bought a 3.7 V lithium-ion cell to replace an old 3.6 V NiCd one in a handheld vacuum cleaner. I am aware that Li-ion cells don't handle current surges nearly as well as NiCds do, and for ...
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0 votes
2 answers
53 views

New lithium ion battery cells stored in small cardboard boxes, potential fire risks? [closed]

I have some new lithium ion battery cells stored in individual small cardboard boxes at room temperature with low humidity. Are there possible fire risks storing the battery cells like this? I'm ...
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0 votes
2 answers
65 views

Li-ion battery 2 in parallel or 2 in series - Capacity vs voltage, which one will give more battery life?

My circuit needs 3.3 volt, and I have 2 options with a Li-ion battery pack. Option 1: I can put 2 cells in series and get approximately 4.4 to 6V (7.4 volt mean) and then using buck converter reduce ...
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0 votes
0 answers
37 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 ...
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2 votes
1 answer
105 views

Preserving lithium-ion battery vs cycle count: Greatest influence between depth of charge vs discharge?

I've read that lithium-ion cells are best preserved by charging them to be less than 80% charge and discharging them no lower than 20% charge. I'm wondering which has the most impact on cell life (...
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2 votes
3 answers
230 views

What resistor network topology to use when measuring thermistors in a battery pack

Some EV competitions require that 20% of the cells in a battery pack be monitored for temperature, and go on to strongly recommend that it be 100%. Considering that batteries can easily contain ...
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0 votes
1 answer
70 views

Using 6S lithium-ion battery with(out) bms?

I built a 6S LTO battery pack and I am wondering - does it need BMS? Battery will be charged with car alternator - voltage wont exceed passive BMS balancing threshold (battery will never reach maximum ...
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