Questions tagged [lithium-polymer]
The lithium-polymer tag has no usage guidance.
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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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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 ...
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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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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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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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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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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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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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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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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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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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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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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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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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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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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 ...
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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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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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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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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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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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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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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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3.7v to 3.3v voltage regulator [closed]
I want to use a 3.7v lithium-polymer battery to power a esp8266 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 ...
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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?
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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 ...
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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 ...
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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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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 ...
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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% ...
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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 ...
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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 ...
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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 ...
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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 ...
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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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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:
...
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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 ...
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Does charging near maximum C rate have the same effect as high battery levels?
We know: The maximum C-rate decreases with the increasing charging state.
Let's assume an 2 Ah Lithium-Ion or Lithium-Polymer mobile phone battery. (2 Ah is considered tiny in 2018, but this is just ...
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Charging and Using a Lithium Battery
I’m using an Adafruit micro-USB Charger connected to a standard 850mAh LiPo battery. I would like to know if it’s safe to charge the battery while also using it. The circuit that the BATT and GND pins ...
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