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Questions tagged [lithium]

Lithium batteries are disposable/non-rechargeable batteries, often found in button/coin-cell form and sometimes in cylindrical cell form. Lithium batteries are used in portable consumer electronic devices, including watches, cameras, calculators, thermometers, etc.

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506 views

Are laptop cells balanced while charging?

I have little-to-no knowledge about how the laptop batteries work. I know there is a microcontroller to actually verify the balancing between cells (and in case blow up a fuse or something similar). ...
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1answer
86 views

Are the specifications of this lithium polymer battery believable? [closed]

I recently found this lithium polymer battery which claims to be 12.6V, 10Ah: http://battery.com.sg/un_product_details.asp?pid=4252 for S$ 67. For reference, a single 18650, 3400 mAh cell costs ...
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3answers
57 views

Massive Parallel Lithium Lead Wire Connection Point

I was wondering where the connection point should be on a "massive" parallel block of lithium batteries. Let's say there is a pack of 100 LiFePo4 18650 batteries all spot welded together with nickel ...
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1answer
543 views

Should I charge a 3.7 V 500 mAh battery with a 5.2 V mobile charger? [closed]

I don't have the Li-Po charger but the mobile charger I have outputs 1 A and 5.2 V. So should I charge it? I completely drained my battery by the way.
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0answers
39 views

Insuring primary batteries are fresh

I am about to go into production with a CR2450 battery powered product that is designed to be in service for 10+ years. What is the best non-destructive way during production to verify the batteries ...
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2answers
330 views

How (do i need to?) do i balance cells during discharge?

i have a 4s4p 18650 lithium ion pack and i balance during charge (from 4 to 4.2V) down to ~5mv difference on discharge i still see >100 mV difference at the end (2.5V). is it worth it to add a ...
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1answer
4k views

Can 1.5v Lithium AA batteries be recharged?

I hope this is the best place for this question. I have some Energizer lithium AA batteries (1.5v), that work very nicely in electronics that have heavy constant usage, such as my Apple Magic ...
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6answers
12k views

What is the truth about 1.5 V “lithium” cells?

At least one manufacturer out there is marketing "Lithium" cells in familiar AA and AAA sizes, as direct replacements for those standard 1.5 V sizes, boasting the typically better than alkaline ...
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0answers
185 views

Recommendation for simple path management circuit for backup lithium battery

I am using a lithium ion (~100mAh) battery in my application, which is almost all the time powered up by 12 V source. The 12V gets converted to 4.2 V through SMPS, which then further powers up the 3....
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1answer
4k views

TP4056 modules with 18650 lithium cells

These tp4056 can charge at lithium battery up to 1A. https://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/TP4056.pdf I would like to use them in series but charging each battery separetely ...
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2answers
2k views

How to calculate amp hours when voltage and amperage changes [closed]

I have a Lithium battery pack. All I know about this battery is that its no-load voltage is exactly 20.0v when charged. I then connect a load to this battery; I have no direct information about the ...
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1answer
1k views

charging a bottom balanced lithium battery

I'm trying to understand the notion of bottom balancing a series battery of lithium cells and I've reached a sticking point in my understanding. Help would be greatly appreciated. Once I've ...
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2answers
156 views

How do I use Lithium Polymer batteries in a very high draw system without tripping the overload protection?

UPDATE: Firstly, let me say thank you for all the responses. I appreciate it. Further to my last, I today tried a little experiment - I ran my 3Ah 12v lithium polymer battery to a heating element ...
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2answers
101 views

Series or parallel lithium cells for 5v portable power supply?

Would it be more typical to connect 2 lithium cells in parallel or series, where a 5v output is required, and the cells should be charged from a 5v supply? Is this due to efficiency, safety, cost or ...
0
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1answer
52 views

What battery specifications to look for, to run the following setup?

I need to run 3 brushless motors(3/5k rpm) of 10hp and 120v each, on a lightweight battery(upto 50 kgs) for minimum of 7 hrs. Is this even possible? What is the closest option I can go for. I am ...
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1answer
314 views

Lithium ion battery cutoff current?

For an upcoming ESP8266 project, I need to use a relatively large (or several smaller) batteries and am hoping to get at least 10Ah. To achieve long life, I will be utilizing one of the ESP8266's ...
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3answers
213 views

Does LiPo4 battery amperage output increase as voltage decreases from 4.2V to 3.57? I'm trying to size up a diode [closed]

I'm trying to determine the max amp output of a battery pack that has 28 cells in it. To be more specific towards what I'm doing: I'm trying to size up a diode for the charge port; the battery charges ...
2
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1answer
212 views

Flat coil inside rechargable lithium battery

Take a look at this de-labeled smartphone Lithium-Ion battery: What is the coil used for? Possibilities I thought of: Wireless charging - unlikely because the outer metal foil would screen the ...
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2answers
6k views

Lithium charge module on NiMh batteries [closed]

Can I use a lithium charge module on NiMh batteries? The charge module has 2 led, one for charging and one for full that I would really like to use with my NiMh batteries.
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3answers
4k views

Li-ion battery maximum discharge current testing

I been playing a lot with Li-ion batteries (NCR18650Bs to be exact) and I have a question regarding how to test their maximum capabilities and generate my own conclusions. If you take a look at this ...
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3answers
5k views

Measuring state of charge of a non rechargeable CR123A lithium battery

Is there a method (voltage, resistance, other...) of measuring leftover charge in a non rechargeable lithium battery? Background: I'm trying to get a general overview of power consumption for few ...
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2answers
258 views

Is there a safe way to run a camera on a Lithium ion AND external power at the same time? [closed]

Similar, but not quite the same to this Question; "Charging and Using a Li-Po battery simultaneously", I want to have a battery in my camera but also connect an external charger at the same time. Is ...
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2answers
952 views

Lithium coin cell battery showing randomness in voltage

I have a CR2032 coin cell battery and using that I am operating a BLE 4.1 module. When I connect a fresh battery in to the module the voltage shows 3.3 V, and after continuous communication with ...
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1answer
810 views

About 18650 batteries possible accidents with reversed polarity

We all know that lithium batteries are dangerous and can blow up if we use them the wrong way. My doubt is, if I accidentally place them in the following sequence in series (Pay attention to the ...
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3answers
124 views

What type of Lithium batteries work best for my project [closed]

I have a scooter with 48v/1000w motor, now I am trying desperately to find a lighter lithium battery but I'm constantly told it will be an impossibly expensive endeavour since lithium is very costly, ...
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2answers
96 views

Changing battery from 12v SLA to 12v Lithium, how can i accomplish this setup?

I am thinking of more speed for a kick scooter project. I have a 800w hub motor for this scooter but at only 40Km/h i am thinking of making it go faster. Now I know that increasing the voltage from 48 ...
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1answer
121 views

Hazards of charging an opened circuitry lithium-ion battery?

I was opening a Toshiba Excite 7 tablet which stopped charging. Tablet turns on without issues when battery is not connected, but does not when it is present. I decided to check the little pcb ...
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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?
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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 ...
0
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1answer
180 views

High temperature battery chemistries

I'm currently developing a solar powered data logger that sits outside in direct sunlight for a good chunk of its life. Preliminary testing has shown that the inside of the enclosure can get up to 70°...
0
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1answer
369 views

Trying to combine two power source into a single micro usb output

I had a power bank which is has 2 usb port that can charge simultaneously, the problem is both of it discharge at 5.1v and 0.5a. I would like to use 2 usb plug combined them in parallel into a single ...
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1answer
450 views

Charging batteries while powering device

This may be somewhat of a common question although there are some specific challenges in this one. I have a bluetooth speaker which no longer charges its internal Li-ion cell. Using a new cell I can ...
4
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1answer
223 views

Are Lithium Thionyl Chloride Battery usable in my vibrating environment? Are they safe?

I have to power a circuit subject to constant vibrations (10-15 Hz with an amplitude of ca 10 millimiters) with a battery and I was thinking of a Lithium Thionyl Chloride Battery. The circuit has to ...
0
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1answer
271 views

Specifications for a charger needed to charge LiFePo4

I have a project with three 4-Cell LiFePo4 batteries. The battery specs: 4S at 3.3V 4200mah 30C I want to charge all 3 batteries in a range of 45 - 75 min (Preferably one hour) What are the specs ...
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2answers
96 views

battery management protection component

I have been looking at a lot of Battery management system/protection circuits lately and there are components that I can't identify. Can anyone tell what is the name and function of the component I ...
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3answers
184 views

Lithium batteries cycle life

We as a group have been trying to write an academic essay about advantages of lithium batteries. We have made some research about lithium batteries and found that lithium batteries have high cycle ...
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4answers
2k views

protection circuit Lithium-ion batteries

I am designing a lithium-ion battery in my project but I am a little confused in regards to certain aspects of the protection circuit of lithium-ion batteries.I know about the different stages of ...
0
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1answer
371 views

Charging board for 3 battery 3.6V used for supply an Arduino board

I would like to build an autonomous system that contains: - An Arduino board (later, it will be just the chip) - A LED strip I decided to use 3x3.6V lithium batteries in series. So, the idea is to ...
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1answer
556 views

How to power small solenoid with a 3.7V lithium battery pack

I've got a small 1.5V 2W pull-type spring-loaded solenoid I'm trying to fire with a 3.7V (45mAh at 1C) lithium pack for about 0.5 sec. I am able to get it to work using a (1.5A max) voltage source at ...
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1answer
1k views

battery chargers - AGM and lithium

I am working on an inverter with a battery charger for a 24V,200AH AGM battery pack. The battery charger current can be adjusted from 10 to 50 amps. Now, I want to be able to also a charge a lithium ...
0
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1answer
83 views

Protection from AAA Lithium Battery

I am working on a system that uses a AAA alkaline battery but I am concerned that AAA lithium batteries that run at 3.7V exist (Amazon link). Can anyone suggest simple circuits that have a low leakage ...
2
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1answer
1k views

PWM lithium-ion charger

I want to make a custom lithium-ion 18650 standard cell charger as I will be charging 100s of them (recycling old laptop batteries). Base on my research, lithium-ion cells use constant-current, ...
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2answers
645 views

Battery simulator

I wanted to make battery simulator, used to test li ion charger, and i have the schematic of the one that i use at work. I turn the knob and adjust the voltage at P1 and i can measure sink current at ...
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2answers
341 views

wire gauge for solderless lithium batteries in series?

I am making a prototype lithium battery of 2kw / 40 amps. it's 8p14s, and every bank of 8 parallel is joined with copper sheet in solderless contacts. I have bought some 0.1mm thick copper sheet and ...
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1answer
1k views

What is this Externally-Triggered Fuse?

In the datasheet for an overvoltage protector (TI BQ771815) there is a device I don't recognize: It is used in the datasheet as a fuse which can be opened by an external signal from the overvoltage ...
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1answer
914 views

charging circuit for series coin batteries

I am designing a circuit that will be powered by two rechargable coin cells in series, and I need to include a module to recharge them in-situ. I have had a look on RS at the range of rechargable ...
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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 ...
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2answers
4k views

How to charge lithium-titanate battery with lower voltage

I would like to charge a lithium-titanate battery rated at 2.4V (capacity 50mah, max charge voltage 2.75V), which is lower than the typical li-ion battery (3.7/4.2V). Most charger ics seem to be ...
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1answer
821 views

lithium polymer battery connections

I'm trying to replace my tablet li po batteries and am trying to understand the connections. The following figure shows the 2 3.7v batteries connected in series. Most replacement batteries I've seen ...
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2answers
2k views

Lithium Battery Charger IC - Charging and Power

Basically, for the circuit I'm making, I need it to be powered by a Lithium battery. Also, this Lithium battery has to be able to be charged via USB. I have seen external chargers for doing so, ...