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Questions tagged [lithium-ion]

Questions regarding Li-ion (lithium-ion) cells and batteries, including proper charging, protection, and usage.

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Uninterruptible power supply for wireless equipment using cheap modules and cheap batteries

I've built an uninterruptible power supply (UPS) to use in my house during power outages that last for 16-18 hours per day. The idea was to use previously bought cheap modules from Aliexpress and old ...
Zero Cool's user avatar
0 votes
1 answer
27 views

Is it possible to get a dual supply from 2S Li-ion battery which has a battery protection IC connected to it

In the image below, can the node connecting cell 1 and cell 2 be used as ground and PB+ as the positive rail and PB- as the negative rail? Those positive and the negative rails will then be regulated ...
Pranav Agumbe's user avatar
1 vote
1 answer
41 views

Selecting the generator frequency for an active battery balancer

I started researching ways to balance batteries and settled on capacitive balancers. I found a diagram on them and most of them use NE555 to generate a square wave with a frequency of ~7 kHz and a ...
minto's user avatar
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1 vote
1 answer
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Step up lFP battery cell voltage - from 44.8v to 53v

I have 50 Ah cells LFP 3.2 V. I connect 14 of them in series - giving me an output of 44.8 V (nominal). I will use this battery pack to power an EV 2 wheel that requires 53 V to function. With a ...
Ameen Khan's user avatar
0 votes
1 answer
41 views

Automobile 12V UPS circuit with Li ion battery

Currently I have a battery backup circuit for a GPS device to run on automobile power source and I am trying to improve a few things. Any help is appreciated. Currently I am facing issues of negative ...
user387542's user avatar
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50 views

Creating a 12.6 V 3S Lithium-ion Charging Circuit from 5 V USB-C

I have some questions about what is considered standard for a charging circuit, as this is something I have not much experience in. I am constrained to the following: 3S lithium-ion battery of 2600 ...
Kevin Lupercalia's user avatar
4 votes
4 answers
797 views

Impact of high-power USB-C chargers on Li-ion battery longevity

Context: I have a 24 Ah 65 W power bank. I use a USB-A 5 W charger and it takes over 12 hours to charge it. Considering buying a more expensive USB-C fast-charger + cable, as this power bank can take ...
DansAltamira's user avatar
2 votes
1 answer
38 views

1 Cell LFP Battery Pack Protection

I am starting a project that requires a single 3.2V LiFePO4 18650 cell to be in a housing with exposed contacts, suitable for easy swapping in and out of an unpowered device. The device will only be ...
zambetti's user avatar
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43 views

How to design a battery charging circuit for solar panels and USB

I'm working on a low-power project using an esp32 and an e-paper display which will be used indoors. It uses a lithium ion battery. I want to harness solar power so the battery has be manually charged ...
uzumaki's user avatar
  • 195
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1 answer
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Why is there a sudden drop at the rest initial point after discharging? (trying to find IR Drop of LIC)

I'm trying to get IR drop of one of my LIC cells. After discharge, at the initial point of rest, I believe there should be a sudden increase in the voltage due to resistance. Does anybody know why is ...
Kyu Dooo's user avatar
1 vote
1 answer
83 views

Can PE and GND be the same for HY2112 to Function?

If C1 is connected to GND instead of PE, will the HY2112 device fail to disconnect the battery? My understanding is that HY2112 (similar to DW01A) measures cell current using R2 as a shunt. If OC for ...
sdolan's user avatar
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1 answer
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Can I charge multipe 18650 lithium cells at fixed 4.2?

This question is edited. I am currently working on an emergency light and I want to power it with 4 18650 cells in parallel. I've tried using TP4056, but that is really slow. It takes well above 10 ...
Saad Nisar's user avatar
3 votes
1 answer
257 views

Lithium ion vs LIPO battery which has more durability

I am trying to build a power bank and due to some asthetic reason, it is better to use lithium ion battery in the project, and also the casing is designed for lithium ion battery. now I want to make ...
Sayan's user avatar
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1 answer
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DC power out projects from laptop batteries

I am aware of existence of SMBus signals on the battery connector and the dialog between battery and computer, to supply and charge However, I am only interested in the DC supply from the battery and ...
Daniel Perez's user avatar
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2 answers
35 views

Drop voltage from 4s Li-ion (16.8v) to 15v and lower for 12 DC-AC Inverter

I am making a high capacity battery bank that uses a 4s Li-ion cells from a car manufacturer. With Li-ion there is no 12v direct drop in replacement as it ranges from 16.8 full to 12.8 empty. So here ...
user3243621's user avatar
1 vote
0 answers
68 views

How does the "earthing" system works in a UPS

PLEASE SEE EDIT 1 I want to know how exactly the earthing system works in a UPS, an example with by the ECOFlow RIVER 2. From their webpage it seems so simple, you charge the battery, switch the AC, ...
JoeyB's user avatar
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batt charger [IMAX B6] - force to charge when LOW VOLTAGE

The Imax B6 battery charger refuses to charge batteries when they are below certain values, and it is highly recommended and safer for users. However, certain times I need to force the load and accept ...
Daniel Perez's user avatar
0 votes
1 answer
56 views

Calculate Li-ion discharge time for two different loads, one after the other

Battery: 2S (2 cell), 7.4 V nominal, 3000 mAh, and 8C max. CC LED driver: TPS92691 LED string 1 (in series): I(f) = 1.5 A CC @ V(f) 17 V As simulated through WEBENCH, the input current required at ...
roaibrain's user avatar
  • 407
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0 answers
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Enable/Disable Power of Board with ESP32-S3

I am using TPS63001 Buck-Boost Coverter with a 3.7 Li-Ion Recharable battery. I want to Control Power of the board with ESP32-S3-Mini. Enable pin of the TPS63001 is connected to MCU and its also ...
Zunuran Nasrullah's user avatar
1 vote
2 answers
57 views

Connecting two Li-ion batteries in series, with different capacity

I'm going to start by saying this is an "emergency", because the delivery of my new battery cells are delayed. I have two 3S Li-ion batteries: one with 2250 mAh (50 C) and the other with ...
Júlio César E. Jr's user avatar
0 votes
1 answer
30 views

Not able to understand S2-5’ in IPM motor datasheet?

I am working on an electric go-kart, the only specs of the motor I have are: Motor type: IPM, Operating voltage: 48V, Nominal power: 6kw, Peak Power: 8.5kw, Peak motor torque: 42Nm, Max rpm: 6700, ...
naman sanghvi's user avatar
0 votes
2 answers
79 views

Bipolar 2s1p Li-ion array BMS and charging

For powering my portable circuit, I need a bipolar power supply of ±2.5 V. The circuit is low-power, but requires very precise power. For its stabilization, I am using ADM7154 regulators for positive ...
nighma's user avatar
  • 3
-1 votes
2 answers
54 views

Is it okay to raise the output voltage of a 5v charger to charge a laptop battery whose charger supplied 15v (with a step up module) [closed]

I have a small 5v 2A charger, I would like to charge and use a laptop battery(for projects) which the laptop it belongs to is destroyed beyond repair, so I can't charge it in the laptop and the ...
Daniel Alemu's user avatar
1 vote
1 answer
55 views

What sort of connector is this (Gtech robotic lawnmower)?

I am trying to get a replacement battery for my Gtech robotic lawnmower but they don’t sell the batteries (they come pre-assembled from the factory apparently). I have opened the mower up and the ...
braindeadclown's user avatar
1 vote
1 answer
55 views

When to include a fuse in a battery protection circuit?

I am working with the MAX17320 and I am looking at two MAX17320 example circuits from AD - the MAX17320 Eval Board and the MAXREFDES1299 for inspiration. Each schematic is roughly the same, except the ...
user1045680's user avatar
0 votes
0 answers
29 views

Powering BLDC motor with 20V 2.5A battery

I have a Pichler Boost 20 motor. Max power load is at 25A/30s, recommended batteries are LiPo 7V or 11V. However, I'm generally against using LiPo batteries. I have however multiple batteries ...
Sterling Duchess's user avatar
0 votes
2 answers
107 views

Will I damage a Li-Ion pack with a charger voltage greater than the pack voltage?

I am building a 4S battery pack with Molicell INR-21700-P42B batteries. I am using an Analog Devices MAX17320G as my BMS and Fuel Gauge for the pack. Can I use a 19V 3.42A wall charger to charge these ...
user1045680's user avatar
1 vote
1 answer
97 views

Charge batteries in parallel, discharge in series

I'm interested in building lithium ion battery packs, and I was wondering if there is a way to change the pack on the fly from series to parallel - basically to allow charging in parallel and ...
Alex I's user avatar
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1 answer
143 views

Vax Blade 4 BMS board issue (5 x 21700 cells Li-ion 18v battery)

I have a problem with our VAX blade 4 4.0ah battery. Referencing this page: Repairing a 5-cell Li-ion battery: dead 21700 cells replaced, but BMS still reporting error when charging it seems that a ...
Rodp's user avatar
  • 9
1 vote
1 answer
47 views

Will this Ebike powerbank circuit work?

A noobie here. I'm making a powerbank for my ebike. The ebike that I have has a power supply that outputs 42 V 3 A. I'm trying to mimic that with my power bank so that I can plug the powerbank into ...
O M's user avatar
  • 11
0 votes
3 answers
125 views

Reduce the current from a Li-ion battery with 6S 18650 cells and BMS to a motor [closed]

Beginner in electronics looking for advice. I got a 6S BMS board from AliExpress rated at 25 A. I need to reduce current to 5-6 A. The board goes in a mobile vacuum cleaner, its motor is max. 120 W. I ...
Aldas 's user avatar
  • 13
0 votes
1 answer
130 views

TP5100 battery charging IC PCB design burning out

It's been almost 4 days now trying to diagnose this design of mine. I ordered 5 PCBs from JLCPCB with this design. Here is my schematic, and the schematic from the component datasheet. It's an TP5100 ...
Gabriel Howat's user avatar
2 votes
1 answer
51 views

Protection circuit for a 12 V Li-ion battery pack

Is there an integrated circuit or a conventional circuit topology to monitor edge conditions of a 12 V battery pack without measuring individual cells within that unit? A conventional BMS or battery ...
lucenzo97's user avatar
  • 2,442
1 vote
1 answer
88 views

BMS 3S 25A circuit diagram explanation [duplicate]

Can somebody help me figure out what the circuit in the red box does? What is the purpose of the six FETs and how do they behave once P- is connected to the negative supply voltage? What is the ...
JoeyB's user avatar
  • 2,389
0 votes
1 answer
58 views

What's the difference in loading outcome with a 42 vs 48 V charger? [closed]

I have a Lithium-Ion battery for an ebike. The battery is 48V, and is rated 15 Ah, so that means 15V*15Ah = 720Wh, and as it says on the battery as well. Now it has a 48V charger (rated 2 amps). ...
Stefan Steiger's user avatar
1 vote
1 answer
27 views

One-Way charging connector for 4S Battery

I want to use a connector to charge the 4S Battery of my underwater robot. The connector is the 6 Pin hybrid Cobalt Series connectors from BlueTrail Engineering (https://www.bluetrailengineering.com/...
Teusner's user avatar
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0 votes
0 answers
35 views

State of charge (SOC) and open circuit voltage (OCV) estimation of INR18650 20R Lithium Ion battery

I want to calculate SOC and OCV of INR18650 20R Lithium Ion battery from CALCE battery dataset available at the website https://calce.umd.edu/battery-data. In a research article I read that SOC = (...
user366549's user avatar
9 votes
3 answers
3k views

18650 Cell (8800 mAh) accepts only 300 mAh on recharge

My ESP32 device uses a new 18650 until it is down to 3.3 V. My charger draws current until it is again at 4.2 V. Its indicator shows that 330 mAh has been loaded. This is surprisingly far off the 8800 ...
Dieter Menne's user avatar
0 votes
1 answer
95 views

Laptop battery "extension" / external connect?

I have rebuilt an old laptop of mine that wasn't working and its chassis broken. In a nutshell after replacing the damaged components; I mounted the board and system on two acrylic sheets as shown in ...
ccot's user avatar
  • 103
0 votes
1 answer
75 views

Standard practice for storage of old / unused lithium ion battery cells prior to disposal

Is there a standard practice for storage of loose lithium ion battery cells that will be disposed of eventually? (in the timeframe of up to 1 year) Currently, prior to disposal, I have been storing ...
plu's user avatar
  • 713
0 votes
1 answer
95 views

Using two "tool batteries" in parallel - Need a BMS?

I have built a Bluetooth speaker, which is currently powered by a single 18V "drill battery" (Bosch BAT609 battery, to be exact - each pack has 5 lithium ion cells, and I assume, its own BMS ...
GWR's user avatar
  • 105
0 votes
1 answer
40 views

Determine proper charger specs for a lithium-ion battery [closed]

I have a device with a rechargable li-ion polymer battery but do not have a charger. Device: ZTE WF723CA ...
Chaim Geretz's user avatar
0 votes
0 answers
92 views

Protector and Charger Circuit for 2P2S 18650 Battery Pack

This post is in addition to my previous post of a different design I was exploring. I am trying to design a custom circuit akin to a BMS that allows for the charging of 2P2S battery pack whilst also ...
scelectron's user avatar
1 vote
1 answer
276 views

Designing a BMS for 2S2P 18650 batteries

I am trying to design a BMS for 4 18650 batteries in a 2S 2P configuration. Some of the requirements are: I would like to charge and discharge from the same connectors I would like to implement a ...
scelectron's user avatar
0 votes
1 answer
48 views

Estimating lithium-ion battery run time at different voltages

A polymer lithium battery in a powerbank (marketed as 30,000 mAh / 3.8 V, 114 Wh), has an actual electric capacity of 19,944 mAh, and an energy capacity of 104 Wh as measured with a constant load ...
user3026965's user avatar
0 votes
0 answers
29 views

Designing a Li-ion charge-discharge controller circuit

I have an interview test task to design a device that contains several sensors of different purpose and a heater. The problem is that the device has to be portable, so I calculated the required Li-ion ...
2222's user avatar
  • 1
0 votes
2 answers
105 views

How to revive this dead 3.7 V Li-ion pouch battery? [closed]

I made this Bluetooth speaker and I was happy it's working. I left it running and somehow the battery is dead. Battery voltage is now ZERO Any attempt to charge it using TP4056 board is not bringing ...
basitj's user avatar
  • 111
0 votes
0 answers
41 views

Switch off V_BACKUP

Please see the below schematic. V_BCKP is used to supply back-up power to the secondary MCU. V_BCKP allowed range is 1.7 to 3.5 V. The current consumption at V_BCKP pin is only a few μA. The LDO's ...
N N's user avatar
  • 1
3 votes
2 answers
164 views

Designing a Battery Management System

We have been asked to design a Battery management system that gets the state of charge while plugged in or not for a prototype EV with 5 batteries in series each 12 V 50 Ah. I've tried looking for ...
TerminalKid's user avatar
3 votes
1 answer
63 views

Can I use two of these modules to charge two lithium-ion cells that are in series?

I need a solution to charge two 3.7 V lithium-ion cells that are in series. However I have a very limited access to modules and I need to have current limitation as my source won't stand beyond 0.5 A. ...
Shamooooot's user avatar

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