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Questions tagged [lithium-ion]

Questions regarding Li-ion batteries (Lithium-ion), including proper charging and usage.

11
votes
3answers
15k views

Measure Lithium ion battery voltage (thus remaining capacity)

What I am working with: I am running my self-made Arduino board (in the sense that I use the Arduino bootloader and code editor) at 3.3V, and powered from a Lithium ion battery, which is USB-charged ...
4
votes
6answers
31k views

Charging Li-ion batteries in parallel

I wanted some opinion on my set up here, just to make sure I got the basics right. I have a Li-ion battery charging circuit based on the MCP73113. This is designed to be a single-cell battery charger....
16
votes
2answers
4k views

How fast can a Li-Ion battery be charged?

So far I've seen many Li-Ion battery chargers that do the full charge in about 1,5 hours or more. There're also NiMH battery chargers that claim they charge a NiMH battery in 15 minutes and then the ...
32
votes
5answers
52k views

Regulated 3.3V from a Lithium-ion (or LiPo) battery

Background I wish to power my circuit with a Lithium-ion or LiPo battery (likely a battery with around 1000 mAh capacity). These batteries have a voltage that goes from 4.2V to 2.7V typically during ...
12
votes
1answer
910 views

How to power a widget, while the li-ion battery is charging?

I am in need of a way to charge a 3.7V li-ion cell (probably an 18650 type) from a 4.5V - 20V input. That's not a problem, there are plenty of (switching) battery chargers around with that kind of ...
5
votes
1answer
16k views

Maximum *charging* voltage for Li-Ion battery

I'm implementing a CC-CV algorithm for charging a li-ion battery. I'm confused what is the maximum allowed charging voltage during CC (constant current) phase. All application notes and datasheets, I'...
2
votes
2answers
2k views

How to prevent DC motor from dropping voltage of supply when switching on

I have a circuit which uses an ATtiny85 output to a transistor (S9013), which will trigger a relay that controls a motor. The reason for the transistor to relay is because I do not have a transistor ...
1
vote
2answers
94 views

Is fast charging a Lithium-Ion battery from 0% to 30% better or worse for the battery health than fast charging at 30% to 70%?

According to this answer, fast charging is only recommended for the battery from 30% to 70% instead of 0% to 70%, while I thought that the emptier the battery is, the higher of a C rate it can handle. ...
13
votes
1answer
20k views

Why charging Li-Ion batteries in cold temperatures would harm them?

Accordingly to what I've found in several sources (user's manual of electronic devices, various forums, e.t.c.) I shouldn't charge my Li-Ion batteries in cold temperatures because this would harm them....
-1
votes
2answers
115 views

Switching Between Two Power Supplies Without Reverse Current

I'm new to electronics, so I'm bound to have gotten something wrong. I'm designing a basic sensor and want it to be powered by USB by default, but use a lithium polymer battery when not connected via ...
10
votes
4answers
12k views

How is fully charging a Li-Ion battery in 35 minutes possible?

I happen to own a power drill/driver that runs on a Li-Ion battery and ships with a charger that charges it fully in 35 minutes and claims to charge it to 70% in 15 minutes. According to answers to ...
8
votes
2answers
13k views

Charging and Using a Li-Po battery simultaneously

My system requires a power which is supplied by a Li-Po. however, I need to keep this Li-Po charging at all time so it won't die. Is it possible to connect the Li-Po to my system and also have it ...
3
votes
2answers
23k views

3 Cell Series Li-ION charging with TP4056

I've searched my situation but cannot find my exact answer, I am trying to make 3S Li-Ion battery charger with 3 TP4056 Charger Module. TP4056 Module 1A 5V one cell battery charger i thought if i use ...
0
votes
1answer
350 views

MPPT charging a li-ion battery

I just designed this MPPT solar charge controller which outputs 4.2 V regulated via MPPT, it uses the SPV1040 IC. This will be used on a satellite with 4 side panels, each with 8 solar cells in ...
0
votes
1answer
79 views

What happen with cells with different current rating put in parallel?

I don't understand how cells behave when connected in parallel. So what if I have two Li-Ion cells: one ist "rated" at 15 amps (which means that the cell is able to discharge at 15 amps without ...
0
votes
1answer
180 views

Charge controller for Li-ion or Li-Polymer battery

I am trying to work out the good charger for Mobile phones, which can serve as good performer for various smart phones out there in market these days & mostly using Li-ion battery. Charging has 4 ...
-1
votes
2answers
102 views

Higher current draw from powerbank?

I have a powerbank with a 20,000 mAh capacity, from which I can power different devices. The devices include an LED strip and a Raspberry Pi Zero W (RPI Zero W). The LED strip consists of 60*5 ...
-5
votes
1answer
3k views

Large 10 kWh 18650 Lithium-ion power pack - What configuration? [closed]

I need to build a 10 kWh lithium-ion pack, anywhere from 70 V to 200 V. This is to drive a motor. Power output will not exceed 15 kW. The cells will be Panasonic NCR 'B' at 3.4 Ah 18650. I would ...
17
votes
6answers
42k views

Combining and Charging multiple Lithium Ion Battery Cells (3.6 V or 3.7 Volts)

1] Voltage: 3.6V or 3.7V Are all 18650 lithium ion battery cells 3.6 or 3.7 voltsor or are there different voltage Lithium Ion cells in the market as well? 2] Possible Voltage Shortage? Do all 3.6/3....
2
votes
3answers
3k views

LDO with low-voltage cutoff?

I'm building a circuit powered by a small Li-Ion battery. The battery will be connected to a 3.3V LDO, which then powers the entire circuit. Li-Ion batteries are damaged if they are allowed to drain ...
8
votes
3answers
17k views

If Li-Ion battery is deeply discharged, is it harmful for it to remain in this state unused?

It is well known that Li-Ion batteries should not be deep discharged. But sometimes they do discharge deeply. Is it OK for the device to remain in such state for a long time (and recharge again only ...
3
votes
1answer
829 views

Battery charging for DIY laptop

I am building a DIY laptop, and I need a battery pack that will allow me to use and charge my device as you would any modern laptop, i.e. by connecting a regular 12-19V DC power brick to a panel ...
2
votes
3answers
638 views

How do phones charge their battery at seemingly any rate with no issues? 500mA or 1A or 1.2A depending on the charger?

If most use some sort of li-ion battery, and those batteries like to be charged in CCCV format how can my phone charge just fine at 5V, 500mA or 5V, 1A or 5V, 1.2A just fine (actual current delivered, ...
7
votes
3answers
30k views

Is draining a Li-Ion to 2.5v harmful to the battery?

I am running one of my projects from two 2000mAh Lithium Ion batteries wired in parallel I decided to let the battery run until it died, just once, to see how long it would last. It lasted 25.9 hours,...
4
votes
6answers
16k views

How to charge Laptop Li-ion Battery cells manualy?

I have received some Li-ion batteries which were originally used in Asus A2 Laptop battery original one and I would like to know if it is possible to charge each cells independently with some device ...
2
votes
2answers
5k views

Use a lithium ion battery from a laptop, for a small project?

Now laptop batteries are very expensive, however I have a slightly beefy Dell Inspiron 1525 laptop with a half year old battery that works fine. Other than complete depletion, of which I have heard ...
1
vote
1answer
2k views

How are cell failures handled in large lithium battery packs?

In a large battery pack of lithium-based cells for an electric vehicle or grid storage system, how are failed cells handled? Answers to another question indicate these cells are usually hardwired in ...
1
vote
2answers
10k views

Simplest possible circuit for charging a li-ion cell

I want to create an ad-hoc single cell li-ion charger. I have a buck step-down that can supply 4.2 volts. If I connect a 1 ohm resistor in series with the lithium cell, the current should go down to 0 ...
1
vote
2answers
4k views

Do I need special charger for a Lithium-Ion battery?

I want to use a Lithium Ion Battery. I saw that there is also a different kind of chargers like Adafruit Micro Lipo/MicroUSB or Adafruit Micro USB Lipo for this kind of battery, do I need it? Can I ...
5
votes
1answer
26k views

Charging lithium batteries with solar panels

Let's say I have a battery pack made from 3 lithium-ion cells connected in a series (making a battery with around 12 volts). That battery pack has a PCB with balancing function and also protects the ...
4
votes
1answer
3k views

How to measure Li-Po battery leakage?

I'm working on a low-low power system, which is powered by a little solar panel and a Li-Po (Lithium-ion Polymer) battery, which can be \$20\$ or \$ 50\:\mathrm{ mAh}\$. The capacity by now is not ...
3
votes
1answer
2k views

How deleterious is topping-off my Li-ion batteries (phone/laptop) every time they drop to 90%?

I have read recently that frequent top-off charging of my personal electronics is hard on the batteries. Specifically, Li-ion batteries in recent model smart phones and laptops will show significant ...
3
votes
2answers
2k views

How to efficiently heat a lithium-ion battery so that it can be charged in sub-zero environment?

A common knowledge and practice on lithium-ion batteries is that they significantly loose the capacity and cannot be charged when their temperature drops below 0 deg of Celsius due to increased ...
1
vote
4answers
22k views

Charging 2 Li-Ion Batteries via a single charger

I'm currently building a portable USB charger. It uses 2 Li-ion batteries in series connected to a USB port via a 5V regulated buck converter. While a single Li-ion battery would suffice for most ...
0
votes
1answer
12k views

How to turn-on laptop's battery pack after replacing cells? [closed]

After a few years of use, my battery pack finally died. The laptop doesn't even detect or try to charge the pack anymore. So I replaced the cells in the pack for new ones, but that didn't make it to ...
8
votes
6answers
3k views

How dangerous are disconnected bulging batteries?

It is well understood that if you have a device that uses a Lithium-Ion battery, and if the battery starts to bulge, then something is wrong with the battery and you should properly dispose of it by ...
4
votes
2answers
5k views

Charging li-ion cell using constant-voltage only

Introduction Various resources [1] [2] state that the optimal method of charging a li-ion cell -- such as one found in a mobile phone -- is to charge at a constant current (usually <1C) until a ...
4
votes
4answers
1k views

Overclocking my toothbrush

I use these toothbrushes: http://www.amazon.com/Oral-B-Advanced-Toothbrush-Vibrating-Bristles/dp/B00336EUV8 They tend to run out of battery quite quickly. I'm happy to keep buying more because ...
4
votes
1answer
7k views

How can I use two TP4056 with two li-ion batteries, but single load?

I have two TP4056 modules (with protection circuit), which I am using to charge two batteries respectively, off a single power line. The modules are the ones that have charge output (B+/B-), and ...
3
votes
2answers
355 views

Li-ion Battery Rejuvenation

What can be done to repair or restore an ageing/dead/failing Li-ion rechargeable battery? As they get older; they typically, gradually lose their capacity to hold a charge. What physical and/or ...
3
votes
3answers
2k views

Designing Under/Over Voltage LiPo protection circuit

I am currently trying to design a protection circuit for a project of mine that uses a single cell 3.7v lithium ion battery. I found this image online which uses 2 TL431s: However, I am really not ...
3
votes
1answer
944 views

What is a good melting point for a lithium battery contact fuse?

Tesla uses a fuse on every battery for their cars, and many fusible alloys melt from 50 to 90 degrees. because the fuse is welded onto the battery it wouldn't matter what the fuse current was, you ...
3
votes
1answer
2k views

Li-Ion battery over discharge protection

I'm designing a Li-Ion battery charger circuit with a bq24702 chip. I will use it with two Li-Ion batteries connected in series. In order to protect the batteries from over discharging, I have to know,...
3
votes
1answer
2k views

What affect does charger wattage have on lifetime of LiIon batteries?

This questiuon is generic to LiIon and LiPo batteries but a Mac is used as an example. A Mac 'laptop' is provided with a 85 Watt charger. It is possible to charge it with 45 Watt charger that was ...
3
votes
1answer
561 views

Charge a Lipo with only Constant-Current Stage?

I'm following this standard algorithm: http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries Algorithm for charging LI-PO batteries? but am wondering if I can get ~80% of the ...
3
votes
3answers
2k views

Water on Li-Ion battery fire: good idea, bad idea, or neutral?

I always thought (like this guy) that putting out a Li-Ion battery fire with water was a bad idea because of the reaction between water and lithium. But now I read from one source: Lithium-ion ...
2
votes
3answers
5k views

How can I charge my beard trimmer's Li Ion battery from USB?

I have just bought a beard trimmer with a built-in Li ion battery. The charger that comes with it says its output is "4.2V, 600mA". I know Li ion batteries will misbehave (!) if fed the 5V from USB. ...
2
votes
1answer
17k views

Calculating battery percentage using an Arduino

I'm doing a little project using a Lipoly charger and a 2500mAh 3.7V battery, both from Adafruit. I'm trying to display the percentage left on the battery. For that I'm using this little sketch : <...
2
votes
3answers
4k views

Is it possible to use a MOSFET for Li-ion reverse polarity protection when protecting a charger?

I've made a simple charger out of 4 TP4056 modules and 4 18650 sockets. These modules have overcharge, undercharge and overcurrent protection included, but I also want to know how simple it would be ...
2
votes
1answer
386 views

RTC battery deep discharge protection

I'm doing an application using RTC on STM32F091. I'm using a small rechargable Li-Ion battery (such as MS920SE-FL27E) as the Vbat power source for the RTC. My concern is, how can I protect the ...