Questions tagged [lithium-polymer]
The lithium-polymer tag has no usage guidance.
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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 ...
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1
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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 (...
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1
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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
...
4
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1
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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 ...
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2
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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 ...
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1
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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 ...
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1
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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 ...
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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 ...
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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 ...
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0
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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 ...
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Control LED strips (SK6805) using Arduino Nano and Lipoly 3.7 V battery
I am creating an LED strip controller with an Arduino Nano and a 3.7 V LiPo battery. As I understand it, the operating voltage of the Nano is 5 V, and the logic voltage is 3.3 V. Furthermore, (...
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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 ...
2
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1
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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 ...
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1
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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 ...
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2
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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 ...
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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 ...
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2
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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 ...
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1
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656
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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, ...
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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 ...
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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 ...
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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 ...
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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 ...
2
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2
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From Li-Ion to Li-Po battery: design a new battery pack for old mobile phone
I have an old working mobile phone. The battery, a compatible 3.6V 500mAh Li-Ion is almost dead (the original one was 800mAh). Is it possible replace the battery pack with a 1200mAh or so Li-Po ...
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2
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How to design a lithium-ion battery pack?
I have a project that I am working on that requires the use of a rechargeable battery pack. The major issue I have is that the battery pack needs to be as slim as possible. So far all I could find are ...
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1
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How many battery cells in a smartphone?
Are most batteries built into smartphones (e.g. iPhone) single cell batteries?
If so, why might that be?
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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 ...
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2
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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 ...
0
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1
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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 ...
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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-...
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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 ...
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Lithium Ion prolonged lifespan
According to the Battery University, charging a Li-ion cell to just 3.92 V is the optimal voltage to avoid stress and lithium plating. Problem is, nearly all consumer chargers focus on going to 4.2 V ...
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Will it hurt a non-powered power supply to see 12/24V on the output?
For an RC (mostly LiPo) battery charging setup I've got a 48V Meanwell AC->DC PSU supplying power to the charger. I'm considering simple ways to power the charger either by this PSU or directly by a ...
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Load Sharing charging circuit for Lithium polymer
Charging lithium battery while at the same time trying to use circuit didn’t quite workout, with problems like the circuit not turning on and the battery never finish charging.
The battery is 3.7V ...
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Sourcing 3-lead 3.7v LiPo batteries
I'm attempting to source replacement batteries for some medical devices (digital goniometer, inclinometer, etc.) The markings are:
GMB063048 3.7V 800mAh 2.0WH 2010.12.08 R
I've found batteries of ...
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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, ...
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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 ...
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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 ...
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1
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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 ...
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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 ...
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0
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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 ...
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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 ...
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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 ...
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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 ...
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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: ...
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2
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Charging Li-Poly Battery with Small solar panel
I have Li-poly battery that is 4.2V 2000mAh with a protection circuit.
I have solar panel that is 5V 250mA.
The aim is to charge the battery to maintain a fully charged battery, so it really ...
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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 ...
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0
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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)?
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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 ...
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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?
0
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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 ...