Questions tagged [lipo]

Questions regarding Li-Po batteries (Lithium-ion Polymer, Polymer Lithium Ion or more commonly known as Lithium Polymer), including proper charging and usage.

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335 votes
6 answers
83k views

Why is there so much fear surrounding LiPo batteries?

I've been trying to design a charging system for a small robot powered by a 2S 20C lithium polymer (LiPo) battery. Were I to trust everything I read online, I would believe that the LiPo will kill me ...
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  • 4,329
18 votes
2 answers
4k views

LiPo vs. NiMH for kid's toy

I've been researching here and on google regarding potential battery technologies for a toy that I want to make for my kids. I was hoping to get others' perspectives on this, keeping in mind that ...
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  • 3,790
14 votes
3 answers
18k views

Low current battery monitoring

I want to run a micro-controller from a 1S lipo through a 3V linear regulator. I need to measure the battery voltage however. The problem with using a voltage divider is that it would drain the ...
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  • 2,495
12 votes
5 answers
12k views

Parallel charging of lipo batteries, maximum voltage difference?

There are numerous products that enable lipo batteries to be charged in parallel. Most sources are clear on voltage and capacity requirements, which follow pretty directly from basic circuit ...
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12 votes
2 answers
26k views

Understanding LiPo charging / protection circuit

I'm in the process of learning to design PCBs and understanding electronics design. For a project, I need to charge a 3.7V LiPo battery. I also want to protect it from over‑charging / over‑...
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  • 399
10 votes
3 answers
2k views

NiMh or LiPo batteries for unattended charging/usage

I'm in the planning stage of a summer project: A WiFi controlled robot for remotely monitoring a shore home. The robot will consist of a 4-wheel platform (4 motors, 1 A stall current each, 7 V), ...
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10 votes
5 answers
14k views

DC-DC Boost converter in Parallel

I'm trying to power a 12V 1A device with 1 cell lipo battery. At 12W, the lipo would need to provide 3.24A (assuming no power loss) to step up the voltage to 12V and providing 1A. However the DC-DC ...
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10 votes
2 answers
456 views

Before storage why should a Lithium Polymer battery be charged up to only 40-60%

While storing a Lithium Polymer battery cell or a device with a Lithium Polymer battery why should we make sure to discharge the battery to 40-60% (and only then put it to storage)? What happens if ...
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9 votes
5 answers
8k views

How much can I overcharge a 4.35V LiPo?

I'm building a charger for a set of LiPo cells. My circuit needs to make sure they get fully charged to their maximum level of 4.35V. At the same time, the circuit should protect the cells from ...
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  • 2,237
9 votes
2 answers
6k views

"Breaking-in" lithium polymer batteries:Is there any research on that?

Well I just got new batteries for my RC glider and I'm thinking about what to do with its battery. For those who aren't in the RC hobby the story goes something like this: New kid buys a battery and ...
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  • 22.6k
9 votes
1 answer
14k views

How does a battery balance and protection circuit work?

I am building a 4S LiPo battery pack that I would like to incorporate in a portable speaker project and I need to make sure the batteries will never require maintenance beside replacing them ...
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  • 562
8 votes
1 answer
1k views

Is this MOSFET upside down?

I'm looking at existing circuits and trying to understand them so I can design my own. Also to improve my electronics knowledge, for some reason MOSFETs have never quite sunk in for me. I came across ...
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8 votes
5 answers
27k views

Why do drones use Li-Po instead of Li-Ion? [closed]

According to every source I've found the only advantage of Li-Po is their shape, but they are more expensive, have lower energy density and are more dangerous compared to Li-Ion. Why do drones use Li-...
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7 votes
5 answers
20k views

Do cell phone batteries contain protection circuits?

I have tens of old cell phone batteries lying around and I want to try to make use of them. I've googled around for the answer, but haven't able to come across anything consistent. LiPo batteries ...
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  • 5,794
7 votes
3 answers
29k views

Adding voltage cutoff to a circuit?

I'm powering a project with a 2-cell 7.4V LiPo battery. What circuit do I add to make the unit stop drawing power when the voltage from the battery drops below 6.4V? The goal is to protect the LiPo ...
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7 votes
4 answers
10k views

To protect a LiPO cell from undervoltage, how low current is low enough?

This may seem like a topic beaten to death, but bear with me.. this is an apparently ignored wrinkle. Over the past several weeks I've been designing various circuits to protect a LiPO cell from under-...
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  • 3,115
7 votes
1 answer
18k views

LiFePo4 vs LiPo

I'm planning on building an Ebike and I am not quite sure what type of battery I should get. What are the bigger differences between the two? I have Googled, but I don't understand the answers. I ...
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  • 225
7 votes
1 answer
8k views

Under Voltage Protection for LiPo Battery

I have a 3Cell LiPo battery which I am going to use with an RC Car, and I want to design a circuit to protect the battery cells from going under ~3.3v each. So what do you think of this design? As ...
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7 votes
3 answers
2k views

A separate MCU to cutoff LiPo on low voltage?

I'm designing a project that is going to work on a flying quadcopter. It features an ATmega328P MCU in the main 5V circuit, and is powered by a small (<500 mAh) 1-cell LiPo battery. I want to ...
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  • 211
7 votes
2 answers
2k views

Schematic for a lipo battery bleeder overcharge protector

OK, so I am building a 12v (really 11.1v) 10000mah lipo battery. I am going to use it on campouts to run things like 12v fans and car chargers and run other high-current devices that couldn't be run ...
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6 votes
4 answers
6k views

Algorithm for charging LI-PO batteries?

What is the algorithm used in charging lipo batteries? From watching my charger, I see that the amperage is close to the maximum specified (i.e. what I keyed in) at the beginning and gets smaller as ...
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6 votes
4 answers
833 views

Understanding working of MPPT charger

I am trying to understand working of MPPT charger for LiPo battery (3.7V nominal) and 6V 2W solar ‎panel so that I can select right charger for my project. After searching and reading lot of related ...
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  • 163
6 votes
5 answers
971 views

Need help with LiPO batteries

I am planning on a 1 cubic inch robot as my next project in robotics and the biggest challenge I am facing is on the battery. Lithium polymer seems to be the best option in terms of weight and the ...
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  • 807
6 votes
2 answers
13k views

Add a rechargeable LiPo to Arduino micro project

I'm somewhat confused by the various options, hoping someone can clarify which breakout board I need. I want to build a prop that drives a bunch of Neopixel sticks. It should: have a rechargeable ...
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6 votes
2 answers
4k views

LiPo charger MCP73831 does not light an LED with it's STAT pin when done charging

I'm trying to charge a LiPo with MCP73831 with 2 LEDs for status. I have an amber LED D1 which is on when VUSB is getting power ...
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6 votes
2 answers
8k views

How to monitor voltage and charge status in USB battery pack

What's the easiest, least intrusive way to monitor voltage, charging status, and remaining charge of a USB battery pack? Battery packs and charging circuits for mobile projects can be complicated and ...
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  • 4,329
5 votes
6 answers
601 views

why do laptops have 10 or 20 volt batteries if most components only use logic level voltages

I've noticed that often laptop chargers and batteries are higher voltages than logic levels, 1 to 5 v. I am building a laptop and was originally using 3.7 v lipo battery. I am curious if I should put ...
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5 votes
1 answer
1k views

Unable to understand Drone's LiPo battery capacity loss

I have ruined a 3S LiPo 5400 mAh and I am unable to understand the reason. This is directly related to my earlier question which was about same battery. I bought a new balance charger and put the ...
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5 votes
3 answers
2k views

Can I draw power for a component while this charger is charging the battery?

So I am working on a design for battery-heated wrist warmers. My mother has Reynauld's and arthritis, and as winter approaches it gets much worse. My basic design is that I will take a form-fitting ...
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5 votes
1 answer
350 views

Block battery if USB is plugged in

I'm building a battery powered device and I want to make sure, that no current is drawn from the battery, if USB is plugged in (while charging). I know that I could solve this with two diodes, but ...
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  • 73
5 votes
1 answer
3k views

Are lithium ion batteries damaged by strong magnets?

I'm wondering if it is okay to put a lithium ion battery directly next to a strong permanent magnet. Would this affect the functioning of the battery? Can it lead to early failure? In the worst ...
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  • 3,279
5 votes
2 answers
5k views

How to charge Polymer Lithium Ion Battery that comes with the Lilypad Development Board

There is a Lithium Polymer Ion Battery that comes with the Lilypad Development Board from Sparfun. Does anyone know if the battery charges if we plug in the battery to the Lilypad Arduino and connect ...
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5 votes
2 answers
9k views

Charging a 12.6V 3SLiPo from 5V USB (Or similar) voltage?

So, I understand that a 3Cell LiPo battery can output 12.6V when fully charged and that the cells must remain balanced to guard against Fire/Explosions/and general bad stuff happening. However, each ...
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  • 444
5 votes
2 answers
3k views

Circuit for testing LiPo batteries?

I have some lipo batteries I'd like to test. Ideally it would do the following: how much time does it take to discharge to minimum allowed voltage? how flat is the discharge curve? how many mAh were ...
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5 votes
3 answers
4k views

Charging High Cell-count LiPo batteries

I have a question about charging and balancing a 10-12 cell LIPO battery. I have been searching around for an all in one solution chip but come up empty. I have also found out that there are almost ...
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  • 491
5 votes
1 answer
618 views

Drawn out question in regards to DC power to battery backup

Story: I have a lego train that is modded to run off of a 9v train track rail system that was a control function of 0 to 9 volts when fully on. LEGO does not make the motors that can run on these ...
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  • 59
4 votes
5 answers
355 views

Choosing the type of battery for a project

I am working on a machine which consists of 10 servos, and one microcontroller. The servos need to be on pretty much all the time for about 8 minutes. I am planning on using the ATmega16 to provide ...
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  • 5,752
4 votes
1 answer
8k views

Reading a Li-po battery's remaining charge

I want to read the remaining charge on a Li-po battery in a device I'm making but I'm confused as to exactly how to get an accurate reading. I know that the voltages of the battery are different ...
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  • 1,668
4 votes
2 answers
1k views

Measure LiPo Battery Cells with Voltage Divider?

First, I am new in this topic, so please excuse unnecessary questions. I want to measure the (four) cells of my lipo battery. The connector of the battery has a plus pole and four minus poles. (Image)...
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  • 143
4 votes
2 answers
1k views

What is the best way to mount a LiPo battery in a project box?

If you were going to use a LiPo battery such as this one: . . . and needed to mount it safely and securely inside a project box similar to what is pictured below what best way to achieve that?
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4 votes
2 answers
809 views

Circuit safety -> Preventing smoke through accidental connection of battery voltages

I'm building a circuit whereby users are able to connect their battery to the pcb which will then be sampled by a micrcontroller. Voltage divider circuitry is all good so please don't focus you ...
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  • 511
4 votes
1 answer
198 views

Li-Po battery ritual when using first time

We are using lithium-ion polymer battery in our project. The battery manufacturer recommends that battery needs to be fully charged and discharged for four times before usage as to reach its maximum ...
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  • 385
4 votes
2 answers
2k views

Powering a circuit from either USB or LIPO

I have a small hobby project which includes MCU and some peripherals. It is powered by 3.3V power source and consumes 200mA-800mA for up to a minute. However, most of the time it's in deep sleep mode ...
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4 votes
3 answers
912 views

How do energy harvesting ICs like LTC3106 and LTC3105 safely charge lipos?

I'm designing a simple device with a single cell LiPo that I want to be chargeable from a single solar power cell. As I start to look through the data sheets, I'm seeing that the battery charging is ...
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4 votes
6 answers
20k views

What's the correct way to solder wires on that (LiPo) battery's terminals?

I need to solder a wire on each of the terminals on the battery shown below. They are approx. 15mm large. Should I solder the wires, of use some sort of clamp? It looks like the terminals are made of ...
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  • 197
4 votes
1 answer
884 views

Would it harm a LiPo to charge it in several periods?

I have a 3.7V 5000mAh Lithium-Polymer battery cell, which I'm charging with the MCP73831, using the typical application circuit on page 1: I have \$R_{prog}=2\text{K}\$ and \$V_{in}=6.0\text{V}\$. ...
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4 votes
1 answer
6k views

USB to 3-cell Lipo charger?

I have a data-logger project that needs to run from a 3-cell Lithium Polymer battery. It has 5v and 3.3v regulators to provide regulated power to the system. I want to build the battery into the ...
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  • 163
4 votes
1 answer
408 views

I'm trying to build a lipo discharger

The way I want it to work is to slowly discharge the lipo down to storage voltage and then stop. I think the best way to do this is to use a TL431 to control the voltage shutoff and use a power ...
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4 votes
1 answer
2k views

Discharge curve of a LiPo battery

What is the mathematical formula to calculate the voltage of a (typical) LiPo battery as a function of it's charge, current flowing and external temperature?
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  • 186
4 votes
1 answer
2k views

BLDC Regenrative ESC and LiPo [closed]

I am currently working on a project where I want to implement a Brushless dc motor (like the Turnigy C2226 - 1800kv) to run in-hub of an RC car. I need this entire project to be as lightweight as ...
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