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Questions tagged [lithium-polymer]

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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
  • 783
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
1 answer
160 views

Help with selecting charging IC for LiPo battery charge management

I have a project for which I have a 1 cell LiPo battery, and of course I need a BMS to monitor it and charge it/ensure it doesn't get discharged too far. I also want LED indicators to inform of the ...
Arthur Isnt original's user avatar
0 votes
1 answer
70 views

Battery Bank Replacement [closed]

I have an old power bank with swollen battery with the specs you can see in image 1 This is the module, but I can't find any specs nor schematics on the internet. The image below will show the full ...
Johan Darmawan's user avatar
0 votes
0 answers
65 views

Lithium Polymer Battery Touching a Stepper Motor

I posted this question in the Arduino forums, but I thought I would post it here too for a broader audience of advice. Hey there everybody :) I’m Cal and am super new to Arduino. I’ve been into ...
Cal Courtney's user avatar
1 vote
0 answers
92 views

What happens if you bypass the load sharing FET in a Li-ion battery charger IC by connecting the input directly to the output pins?

I'm developing a lithium-ion battery (4.2V) charging circuit using the MPC73871 from Microchip - a linear charge IC with load sharing functionality. The output of the charging IC will feed into a ...
Nick's user avatar
  • 11
1 vote
1 answer
844 views

Why does my LiPo charger's display voltage not match the battery's measured voltage?

I'm using an HTRC C150 charger to charge a single-cell LiPo battery for my RC quadcopter. When I let the device charge the battery, it ends with a reading of 4.2V, however, when I connect a multimeter ...
Taylor Brown's user avatar
2 votes
1 answer
38 views

Unexpected voltage in Li-po charger circuit

I'm confused about something with this Li-po charger circuit: The components are: U2 - Li-po charger IC is MCP73832T-2DFI/OT U1 - LDO is 621-AP2210N-3.3TRG1 Q1 - MOSFET is DMP3099L-13 D1 - Schottky ...
Charlie Skilbeck's user avatar
1 vote
1 answer
54 views

Power sharing with Li-po charger

I'm working on a Li-po charger with power sharing. I had a look at this post which shows a circuit like this: I may well be misunderstanding, but I can't see how the MOSFET Q1 is ever switched on. It ...
Charlie Skilbeck's user avatar
0 votes
0 answers
250 views

DIY TP4056 Li-Ion does not charge

I created a DIY TP4056 Li-Ion charger, but for some reason it does not charge. Here is the schematic I created in EasyEDA. I tried replacing R4 with 2k - no effect. The red LED keeps flashing when I ...
Post Fah's user avatar
4 votes
1 answer
4k views

Replacing three AAA batteries with a 3.7 V, 1200 mAh lithium battery

I have earmuffs that use three AAA batteries that need to be replaced after one day's worth of continuous use. I was wondering if I could replace these batteries with a 3.7 V, 1200 mAh lithium ...
WillNZ's user avatar
  • 143
0 votes
2 answers
93 views

Calculate a phone battery capacity by percentage charged with a given input

I wanted to see if I can calculate an Android's phone battery capacity by plugging into a powerbank that displays the output in Watts. I see that the output is shown steadily at 17.2W and the battery ...
ono's user avatar
  • 103
0 votes
1 answer
806 views

LiPo Battery (parallel cell) Protection - Fuse Selection to Support BMS

I'm designing a LiPo battery and I'm struggling with the protection, or more specifically, the fuse selection. Can I please have some help? This is a really convoluted problem with a lot of factors, ...
Dan's user avatar
  • 133
4 votes
1 answer
425 views

Solder reflow pure nickel strip to PCB ENIG pads

I've arranged for a custom shaped strip of pure nickel that I intend to solder to ENIG pads on a PCB using reflow/paste. Will we have problems getting the solder to adhere to the nickel? Is there a ...
Dan's user avatar
  • 133
1 vote
1 answer
128 views

Is there a way to connect JST RCY female end to JST PH male end?

I recently bought a lipo charger with a 2 pin JST RCY female end, however I did not realize the lipo I owned had a JST PH 2 male end (not RCY), so I was unable to connect the two and charge the ...
Rena W's user avatar
  • 123
2 votes
1 answer
593 views

USB-C QC3.0/PD charging circuit for a portable device

(Maybe) trivial question for sophisticated electronics engineer but hard one for a newbie in Li-Po battery charging design. My portable device is planned to have Li-Po battery and USB type-C port for ...
Ivy Growing's user avatar
1 vote
2 answers
3k views

Can I charge a 3.7V 150mAh LiPo battery from USB?

Can't get a clear answer anywhere. Need to replace small batteries in small sports mp3 players. They had 150-190 mAh Li-Ion batteries. All I can find are Li-Po replacements. Can I charge those the ...
MarkSpace's user avatar
  • 111
1 vote
1 answer
409 views

Risks of exceeding current discharge rating of a LiPo battery

I have a project that consumes a maximum current of 1.6A, that requires the use of a small LiPo battery. I have one that has the perfect size, but has capacity of 400mA, and a discharge rating of 1C (...
Jay's user avatar
  • 1,195
2 votes
3 answers
2k views

Is there any difference between a Li-ion and a LiFePO4 BMS?

I am exploring how to make lithium battery packs and trying to build my own for electric vehicles. I have learnt about both Li-ion and LiFePO4 cells and understood their differences. My question is on ...
sribasu's user avatar
  • 754
0 votes
1 answer
270 views

Leave phone connected to charger when full or disconnect, drain, reconnect, repeat?

I’ve heard that lithium batteries are most stable at 50% charge and anything above or below that causes their capacity to degrade. If I know I’m going to be on my phone for a few hours and a couple of ...
Danny Beckett's user avatar
0 votes
1 answer
57 views

Lithium polymer battery charging and management

Can someone help me understand this type of lithium polymer battery charging and management. I have the following battery https://www.alibaba.com/product-detail/plug-1-5-3P-704260-...
resolver101's user avatar
1 vote
0 answers
134 views

solar charging lithium batteries in cold environment

I'm trying to devise a strategy to allow my system to run off lithium batteries. From what I understand charging a lithium in freezing temperatures is a big no-no, and my project will face these ...
davegravy's user avatar
  • 439
0 votes
0 answers
81 views

Li4S Battery Full Error - iMax B6

I burnt 3 chargers (Imax B6) simultaneously by connecting Lipo 4s battery in reverse . All showing connection break error. I changed the burnt MOSFET (U5) in all chargers, one charger is recovered and ...
Sidk's user avatar
  • 159
1 vote
1 answer
2k views

What is the best way to charge phone's lithium-polymer batteries to optimize battery life? [closed]

I was looking for tips on how to best charge a phone which comes with a lithium-polymer battery, but most articles online talk about lithium-ion batteries. Can the same tips, for example those in this ...
Thomas's user avatar
  • 113
3 votes
1 answer
6k views

TP4056 Output-Voltage too low when connected to Load

I am designing a battery powered Esp32 board for the Institute I am working at. I recently got my hands on the board and the battery charging circuit has an issue. The TP4056 that I used should ...
Emre Mutlu's user avatar
1 vote
2 answers
1k views

Different capacity lithium-ion batteries in parallel

Is there any problem if I put different capacity,from different manufacturer with different specification? This is my current configuration: DW01 Protection Bord is being used on both. But power bank ...
Shohidul Alam's user avatar
1 vote
2 answers
553 views

How to make a solar battery charger for more than one lithium-polymer cell?

I have at least five Lithium-polymer (not 18650) batteries taken from a laptop. The print on them is pale; it says 14.01 Wh (six cells: 6 x 14 = 84 Wh, but I split each battery now.) They are 3840 mAh ...
Kris Swat's user avatar
  • 111
2 votes
0 answers
27 views

How do bluetooth headsets handle 2C charging current?

I have used a few of those bluetooth headsets that are wireless stereo (TWS) ones and are charged by a case in which you insert them. I haven't used expensive ones, just rebranded chinese ones. All of ...
Bagho's user avatar
  • 91
1 vote
0 answers
239 views

Li-Ion/Li-Polymer Battery Charger mcp73871-2cci/ml Issue

Hope someone can help. I have designed a pcb board based on the mcp73871-2cci/ml. No matter what I change there is no current draw and all the indication LED’s remain on. I have seen some example ...
Carlos1612's user avatar
1 vote
0 answers
57 views

Connecting both brushed DC motor and brushless DC motor to a battery

Warning: I am robotics beginner!!! Hi, I am working on a robot car in which four tyres are connected to brushed DC motor controlled using Arduino and Arduino motor shield. Also it has one brushless ...
Mohit Mangal's user avatar
0 votes
1 answer
63 views

May I connect 3.6v Li-pol accumulator to 3.3v dc supply?

I have an old Bosch electric owen which has clock and timer on-board. The problem is: on each electricity fail (even milliseconds) this clock resets to the time edit mode and zummer starts to make ...
Epsiloncool's user avatar
0 votes
1 answer
1k views

Can i charge an LiFePo4 32650 cell using an 18650 li-ion charger

i have this li-ion 18650 charger i found, pic attached below. I need to know if i can use this to charge a LiFePo4 32650 cell i bought here, the cell doesnt fit in due to the obvious differences in ...
Aditya Rajendran's user avatar
1 vote
1 answer
207 views

How to connect a Sparkfun LiPoly Charger to an Arduino Nano?

I was able to upload the Adafruit SSD 1306 OLED Library to an OLED Display using an Arduino Nano. Now I want to power the Arduino Nano via a Lipo Battery but the battery must be rechargeable and I ...
Ronald Sheaks's user avatar
0 votes
0 answers
430 views

Do li-po batteries need esd protection?

I bought some li-po batteries and they were in antistatic bags. They have protection circuits. Do they need esd protection (grey bags)?
Tabin1000's user avatar
9 votes
2 answers
239 views

Looking for a explanation/cause of lithium polymer battery failure

I'm hoping that someone on the EE StackExchange could give me some insight into what is going on with some lithium polymer batteries that I have under test. The question I am trying to answer is: ...
RobGah's user avatar
  • 91
0 votes
1 answer
32 views

Using solar to recharge a Li-po battery

I'm looking for help determining what size of solar (PV) I should use to recharge my Li-po battery after discharged. Battery Characteristics :Capacity:1600mAh Nominal Voltage: 3.7V Charging ...
Bryan Cunningham's user avatar
0 votes
2 answers
11k views

3.7v to 3.3v voltage regulator [closed]

I want to use a 3.7v lithium-polymer battery to power a 826۶ wifi module in a mechatronic project. This module works with 3.3v and I'm not an electronic expert so I use modules to avoid mistakes and ...
2012User's user avatar
  • 135
2 votes
1 answer
240 views

Lithium polymer battery numbering

Lithium polymer accumulators has 6 numbers on it. For example accumulator on the following image has 350830. What does this number stands for?
Misaz's user avatar
  • 385
0 votes
1 answer
1k views

Charging a 4.4v lithium polymer battery with 5v?

Can anybody tell me how can i charge a 4.4v lithium poly. battery. I have a tp4056 charging circuit, but the problem is that it stops charging at 4.2v. I have searched on Ali but haven't found any 4.4 ...
Dinesh Bhardwaj's user avatar
3 votes
3 answers
6k views

Charging a lithium battery to 4.34 V

I recently came across a device (a headlamp) with lithium-polymer battery, which is marked 3.8 V nominal voltage, instead of usual 3.6-3.7 V. It's charging circuit is based on ME4057D chip, which is a ...
simonov's user avatar
  • 121
1 vote
4 answers
342 views

How to use a gas gauge?

I must have missed an article, lesson at uni, or something obvious because I'm struggling to work out how to write some firmware to use a gas gauge to get out a rough percentage of battery remaining, ...
DSWG's user avatar
  • 1,620
3 votes
0 answers
482 views

TP4056 with DW01, can I use a diode to create an "UPS"? Design review

I'm studying lithium cells and their related mainstream modules. One of the most common -yet wrong- use of the TP4056 module is to use it with the USB 5V input and an active load on the output (at ...
theGarz's user avatar
  • 168
3 votes
1 answer
117 views

What would cause my eReader's battery to suddenly start smoking? [closed]

I was listening to some MP3 files on my eReader while shopping at a hardware store, looking at a power generator. I previously checked the battery's percentage and it told me that it was at 80% ...
HeavenlyHarmony's user avatar
-1 votes
1 answer
96 views

Does battery wear depend more on EMF voltage (capacity) or terminal voltage? (charging full slowly vs. charging fast)

Let's say there are two identical Lithium-Ion batteries. (is it any different for Ni-MH batteries?) One gets charged at 0.1C until the EMF voltage (which is capacity-dependent) reaches 4.3V. The ...
neverMind9's user avatar
0 votes
2 answers
362 views

How to check protection circuit in lithium battery

I've recently bought a single cell, 600 mAh lithium battery (like this one) and a TP4056 battery charger module, which I intended to use with the battery. The charger has an integrated protection ...
puq_87's user avatar
  • 69
13 votes
3 answers
4k views

How much do lithium polymer batteries expand in volume?

I'm designing a device with a small lithium polymer battery (4x12x30 mm, 120 mA-h). Looks like this: I've heard that there is a rule of thumb that the space left for the battery in a case should be ...
Alex I's user avatar
  • 3,491
1 vote
0 answers
207 views

DC-DC buck output voltage

I am designing a DC-DC step-down converter (asynchronous) and I would like to achieve a Li-Po charging with it (18 - 22 V input voltage). My goal is the CC/CV charging but to do this, I need constant ...
Andrew S.'s user avatar
0 votes
1 answer
634 views

Bad Practice - Charging Lithium-ion Batteries while powering circuit?

I'm using a 2s BMC (Battery Management Control) to charge a 2s2p lithium-ion battery pack (7.4v, ~6Ah). The output of the charging circuit is the same as the input - they're not separate. As a ...
Helpful's user avatar
  • 671
2 votes
0 answers
362 views

Solar Li-Po battery charger with MPPT algorithm

I'm new here but I have read a lot of topics here about my question. I am designing a solar battery charger with MPPT algorithm but I don't know if I am doing it well. First of all my specs are here: ...
Andrew S.'s user avatar
1 vote
2 answers
2k views

What is the efficiency of a lithium polymer battery?

I noticed that when charging and discharging a lithium polymer battery, the incoming/outcoming energy I calculated is very near to the specifications of the manufacturer. How is that possible if any ...
Nic1337's user avatar
  • 135