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Questions tagged [lithium-poly]

Lithium Polymer batteries

11
votes
3answers
351 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 ...
10
votes
1answer
1k views

Intelligently Charging and Profiling Lithium Polymer Battery Packs

Lithium Polymer battery packs are widely used in Radio Controlled (RC) airplanes among other things for their charge/weight advantages. These packs typically consist of X series cells and Y parallel ...
7
votes
2answers
7k views

What type of fire extinguisher do I need for lithium polymer batteries?

I plan on using reasonably cheap powerbanks (like the Aukey Mini 3600mAh) with my own circuits, and - ideally - I'd like to have an appropriate fire extinguisher on hand in case I mess up. I know ...
4
votes
1answer
723 views

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 ...
3
votes
1answer
5k views

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?
3
votes
1answer
2k views

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 ...
3
votes
1answer
398 views

What battery has more capacity: Lithium Polymer or Lithium-ion battery?

In my project I need a battery with a cylinder of 10mm diameter and 35mm high. I thought only Lithium Polymer technology can create battery for this size. Now I discovery Lithium-ion can have the same ...
3
votes
1answer
301 views

How do you protect a Li-ion / Li-polymer battery from over-dishcharge?

I'm setting up a power regulation system for a lithium polymer battery, but I'm aware that my LDO will continue to draw current from the battery even after it's fallen below an acceptable level of ...
3
votes
1answer
133 views

Lipo uninterruptible power supply?

How can you safely build an uninterruptible power supply with Lipo batteries? There are a lot of boards out there for connecting a charger to an external supply to build a UPS. However, all the Lipo ...
3
votes
1answer
421 views

3.7 to 5V Boost Converter Design Issue

I am an electronics hobbyist who has started dabbling in making circuit boards for my projects. I have designed and fabricated a board for a solar powered sign I am making. The sign essentially ...
3
votes
1answer
2k views

Charge Li-Po battery with TP4056? (Or what else?)

I bought a single cell Li-Po battery and two different charger modules (one without protective circuit and one with protective circuit) from AliExpress. The Li-Po battery has a protection circuit ...
3
votes
1answer
107 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% ...
2
votes
2answers
802 views

How can the SparkFun Lipo USB charger power other devices at the same time as charging?

How is this SparkFun charger capable of charging a LiPo at the same time as powering other devices? The Set up would look like this: This is what the schematic looks like. Basically, my confusion ...
2
votes
2answers
1k views

MCP73831 Li ion battery charger problem with load sharing circuit

I am building a device which is being powered by single cell Li ion battery (1100mAh), i am using MCP73831 Li ion battery charger and controller in my design to charge the battery. I am using below ...
2
votes
1answer
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 ...
2
votes
1answer
1k views

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 ...
2
votes
1answer
545 views

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 ...
2
votes
0answers
177 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: ...
2
votes
1answer
57 views

Add li-poly battery to projects

I would like to upgrade my RC project, changing from common AA batteries to li-poly. I've chosen them because I always see them in RC planes/cars. My model would require 7.2/9V and a max instantaneous ...
2
votes
1answer
93 views

Replacing Lithium batteries with larger ones

I have some background with electronics, but that was in the "old days", so my knowledge of lithium battery types and charging processes is very limited. I have a bunch of gadgets with one of those ...
2
votes
2answers
384 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 ...
1
vote
3answers
1k views

How to gauge safety of cheap Lipo batteries?

I see a ton of cheap 12V lipo batteries for sale on Ebay, but other than the mAh rating, I can't find any info or datasheets on how to safely operate them. I'm looking for a good battery to power a ...
1
vote
3answers
272 views

Creating DIY ON/CHARGING switch for an Arduino

Currently I'm using the newly released WEMO LOLIN32 (pictured below), and it's a great board, save for the lack of one thing, a power button. Initially I was thinking of a simple ON/OFF switch that ...
1
vote
2answers
112 views

Can I convert L-ion battery backup to supercapacitor?

I have a RAID card in my home server and the battery went dead. It's a lithium ion chemistry with the circuits to tell the RAID card miscellaneous information. I could buy another L-Ion battery to ...
1
vote
2answers
913 views

Why MCP73871 lithium battery charger IC takes so long?

I'm working on a Microchip IC: MCP73871, a very small linear charger for lithium-based batteries. It has very nifty feature: a load-sharing system that gives priority to the load over the battery in ...
1
vote
2answers
835 views

Lithium Ion Battery Capacity: Discharge Analysis

I have taken apart a battery module consisting A123 Systems ANR26650-M1A cells (they are technically Lithium-Iron-Phospate (LiFeo4) cells) that were used in a commercially controlled environment. ...
1
vote
2answers
375 views

Lithium Ion prolonged lifespan

According to the Battery University, charging a Li-ion cell to just 3.92v is the optimal voltage to avoid stress and lithium plating. Problem is, nearly all consumer chargers focus on going to 4.2v ...
1
vote
1answer
112 views

Rest time for testing lipo cells

My university's student electric racing team has to test a large number (250) of lipo cells before using them in our electric car. Our testing methodology will be approximately like this: Discharge. ...
1
vote
2answers
133 views

Does slowly charging a battery extend the lifetime? -Why?

Does slowly charging (like usb: 500mA) a battery of a cellphone/ tablet/ notebook increase the overall lifetime of the battery itself? If yes: why is it ? Why do LiIon batteries lose capacity over ...
1
vote
2answers
238 views

Is a battery management system necessary for wearables? [closed]

My team and I are working on developing a wearable device (like a heart rate monitor with IP68 dust/waterproofing) and we're utilising wireless charging for our 3.7V 350mAh non-removable battery. We'...
1
vote
1answer
151 views

Prevent Lithium battery discharge until USB/Charging voltage is present (for the first time)

I would like to prevent the battery in a device from discharging (initially) until the usb is plugged in (to keep charge on the battery during storage and shipping). I am using a typical LiPo ...
1
vote
2answers
244 views

Finding an ESC for a LiFePo4 Battery

I have a project that uses 12S LiFePo4 batteries, and I need an electronic speed controller. The main problem I have is that pretty much all the existing ones I've found are designed to work with Li-...
1
vote
1answer
120 views

How can I charge just one Lithium Polymer cell?

I have a small 3.7V 100mAh Lithium polymer battery. This is just like any other Li-Pol battery, but it is smaller. Like any rechargeable battery, I want to recharge it. From what I found online, I ...
1
vote
0answers
42 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 ...
1
vote
0answers
70 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 ...
1
vote
0answers
34 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 ...
1
vote
1answer
536 views

Difference between Lithium Polymer batteries of varying capacity and cell amount

I was looking to purchase a LiPo batteries online for a side project. Upon shopping around, and reading up on LiPo batteries, I have a fair understanding on what the numbers/letters on the battery ...
0
votes
2answers
122 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 ...
0
votes
2answers
294 views

Lithium Ion battery charging

Its just a simple Question Lets Say, I have 4 x Lithium Batteries each 6800mah capacity and Lithium Battery Charger IC BQ24618 from texas instruments. Will I be able to charge these batteries ...
0
votes
2answers
1k views

Best way to power sensor circuit from LiPo

I want to make small (~cigarette pack size) oscillometric blood pressure monitor (with arm cuff). The device will be powered by single cell 3.7V LiPo battery with USB charger circuit, without LCD ...
0
votes
1answer
774 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 ...
0
votes
2answers
576 views

Monitoring Lithium Polymer Battery Voltage from Microcontroller

I am working on a project in which a microcontroller (specifically an RFduino) is powered by a LiPo battery and the microcontroller needs to monitor the voltage of the LiPo. Five of the RFduino pins ...
0
votes
1answer
3k views

Adafruit trinket power question

I am reading the Adafruit Trinket tutorial here. It states that BAT+ is used for battery INPUT: If you want to power the trinket from a battery or power adapter or solar panel or any other kind of ...
0
votes
1answer
662 views

Faster charging of Lithium Polymer battery possible?

I am designing a system which needs to run for 3 minutes, then charge as quickly as possible, then run for 3 minutes, then charge as quickly as possible, and so on. In order to reduce the charging ...
0
votes
1answer
504 views

powering android phone from 3 AA battery directly (not USB!) [closed]

I have Sony Arc phone which was spoiled by me (story OutTopic) as it won't charge lion battery anymore. the phone itself works perfectly. I don't want to do the regular 3AA to USB charger way. Trying ...
0
votes
1answer
52 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 ...
0
votes
2answers
144 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 ...
0
votes
1answer
52 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?
0
votes
1answer
446 views

Paralel charging two Lithium Polymer batteries on a MP3 player Colorfly C4

Is it a good idea to replace a built in lithium polymer battery rated: 3.7 V, 2000 mah with TWO x brand new 3.7 V, 1800 mah (...
0
votes
1answer
121 views

Is there any way to control a 12Vdc relay using 60Vdc line

I have a 60V li-ion battery back with PCM board attached to it for protection. According to the PCM datasheet, under fault condition the PCM cuts off the load and thus isolates the battery bank. The ...