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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.

16
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4answers
9k views

Pulse-powering heavy loads with a coin cell

Lithium coin cells are rated for fairly low standard current draws, on the order of 1 to 5 mA. Also, while they allow greater pulsed current draws (i.e., periodic bursts), this appears to be ...
7
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1answer
20k views

How much lithium in lithium polymer batteries?

This document summarizes aircraft travel guidelines for batteries: http://safetravel.dot.gov/documents/airline_passengers_and_batteries.pdf It has two categories of lithium batteries: 8 grams or "...
0
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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 ...
2
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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, ...
-2
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2answers
174 views

Do Inverters change the lithium-ion batterie's mA capacity and wattage? [closed]

let me say if I have a pack of lithium batteries connected in series and parallels, and i want to connect it to an Inverter, BUT...BEFORE I connect it to inverter, lets say it gives out 12 volts "...
4
votes
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 ...
5
votes
1answer
31k views

How to Calculate Theoretical Capacity and Energy Density of Li Ion Battery

Specifically if the cathode and anode are known materials how do you calculate the theoretical capacity and energy density of the full cell? For example if you have a Lithium Iron Phosphate cathode ...
4
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2answers
4k views

Making a lithium polymer circuit

I want to create a circuit that will power my Raspberry Pi using Lithium Polymer. My knowledge of LiPo is rather low and I believe they can get dangerous if used incorrectly so I turn here. THe ...
6
votes
2answers
28k views

How can I safely charge 3 lithium 18650 batteries to use in one pack?

I'm working on a project to make my own super-bright bike taillight using an emergency flasher LED (something like this:) The LED package requires a 12V input, but from what I've read from other ...
4
votes
2answers
818 views

Safe Lithium Battery Management

I'm building a device that needs to run from Lithium batteries. I am well aware they need to be charged/dis-charged properly to avoid damage and explosions. To my knowledge a charging system has ...
1
vote
3answers
218 views

Is it safe to have 4V continuously supplied to a lithium battery?

I have a compact digital photo camera that will be on for very long periods(for a time-lapse video). It is powered by a Lithium-Ion 3,7V, 720mAh battery I want to supply 4V to the battery terminals, ...
4
votes
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 ...
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
2answers
7k views

How should I connect multiple Lithium Polymer battery packs in parallel?

I have an application for which I need a relatively high amount of current @5V. I was thinking of connecting four external USB battery packs like these in parallel, as they output a nice regulated 5V ...
1
vote
1answer
660 views

Does a crude Li-ion 18650 battery have internal thermal (mechanic?) protection?

For clarification: crude means "it does not have any protection circuit attached". Short history long: I extracted 6 18650 (Sanyo) batteries from an Acer battery pack. They had more than 3V each and ...
1
vote
1answer
122 views

Li-Po charger booster circuit

I'm trying to design a simple circuit that has the ability to charge a single cell Li-Po battery and can be used as +5v power source. I chose the circuit from here. It seems that when ...
0
votes
2answers
315 views

Options for 12v battery pack with charger

I have an amp that requires 12-20v dc power. I'm looking into a solution for a portable battery pack that I can charge while running the amp as well with discharge and overcharge protection. This is ...
0
votes
2answers
114 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 ...