Questions tagged [lithium-polymer]

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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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What conditions are required for a Lithium Polymer battery to ignite?

If a Lithium Polymer battery cell sustains a small amount of damage that only effects the pouch (eg a small puncture or tear in an area where no contact is made to the electrolyte / anode / cathode ...
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57 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 (...
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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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40 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-...
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62 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 ...
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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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1 answer
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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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2 votes
1 answer
2k 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 ...
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1 vote
2 answers
250 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 ...
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2 answers
203 views

How to make a solar battery charger using more than 1 Lithium polymer

I have atleast 5 lithium polymer [not 18650] batteries taken from laptop. the print on them is pale, it is 14.01wh [ 6 cell 6 x 14 = 84wh, but i split each battery now] it is 3840mah each. I would ...
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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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0 answers
50 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 ...
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1 vote
2 answers
191 views

Lithium ion battery CV mode

I am working on lithium ion batteries charging(NMC chemistry, max charge voltage is 4.2). In charging mode after cell reaching 4.2V, charger is going to CV mode and after this Charge ends(based on ...
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1 answer
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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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1 answer
382 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 ...
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1 vote
1 answer
146 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 ...
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177 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)?
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9 votes
2 answers
193 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: ...
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1 answer
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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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2 answers
6k views

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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1 vote
1 answer
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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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1 answer
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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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1 vote
3 answers
3k 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 ...
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1 vote
4 answers
240 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, ...
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2 votes
0 answers
383 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 ...
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3 votes
1 answer
111 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% ...
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-1 votes
1 answer
72 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 ...
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2 answers
195 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 ...
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13 votes
3 answers
3k 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 ...
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1 vote
0 answers
151 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 ...
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0 votes
1 answer
472 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 ...
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2 votes
0 answers
320 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: ...
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0 votes
2 answers
740 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 ...
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1 answer
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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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0 votes
1 answer
175 views

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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1 answer
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Battery protection circuit

I’m trying to design a battery protection circuit for this 300mAh 3.7V LiPo battery. I’m an EE student which is designing his first pcb. Please forgive questions with obvious answers. My questions: ...
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-2 votes
2 answers
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Lithium-Ion - leave at full or charge and discharge [closed]

I am getting a laptop soon, and am wondering if I should leave the Li-ion battery at full during use, or have it charge and discharge within a range of, say, 40-80%. The goal here is maximum battery ...
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0 votes
0 answers
193 views

Best battery configuration: 1s1p vs 3s1p vs 1s3p? [duplicate]

I’m designing a product prototype using a single board computer (like a Raspberry Pi) that requires an 8-18V DC supply. It has to become battery powered, so I’m looking into the best possible ...
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2 votes
2 answers
2k views

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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1 vote
2 answers
216 views

Constant Power Micro Load

I am trying to make a circuit that slowly discharges a multi cell lithium battery to storage voltage. I already have a comparator circuit that can turn on or off discharging. I want to support 2s to ...
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1 vote
0 answers
159 views

A cheaper way of Lipo battery charge and power switching

I have been reading stackexchange for last 5 days but could not see any proper / answered circuit / discussion about Lipo battery charging and backup and thus asking the question here. I am doing a ...
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1 vote
0 answers
52 views

Can lipo and Lithium-ion batteries be used together?

Lithium ion batteries have high specific energy and lipo have high c rating (high power). Is it possible to put lipo and lithium-ion batteries in parallel if they are at the same voltage and ...
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0 votes
1 answer
56 views

Batteries for Drones [closed]

I am making a drone for geological applications and for that we require a flight time of 1.5 hr without payload. Could anyone recommend any battery types of alternate power sources that I could use?
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4 votes
2 answers
1k views

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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1 answer
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May I replace ICR 18650 22F with 26H in Laptop battery?

As in the title, I have a worn laptop battery, made out of 6x SAMSUNG ICR 18650 22F. Now I can't find any 22F near me, nor slightly farther for a sane price. But SAMSUNG ICR 18650 26H are practically ...
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0 votes
1 answer
2k views

Tablet battery voltage

I'm building a sort of homemade tablet out of a 10" touchscreen (designed for RPi-like devices) and an Asus TinkerBoard SBC. The SBC takes the standard 5V 2.5A power source, but the screen requires ...
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2 votes
2 answers
1k views

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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