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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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280LM Led Headlamp needs FCC certificate?

Do I need FCC certification for my 280LM Led Headlamp with 1800MAH Lithium battery which is rechargeable only via USB? More details: Watts out: 3W Lithium-ion Cells: 103450 Energy Content:1800Mah ...
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316 views

Help with high current single cell lithium charging

I am designing a system to charge a single cell lithium battery. It requires pass-through, path-selection, over and under voltage protection. The bottom line is this system needs to power a device ...
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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 ...
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230 views

Are there any high energy density (i.e. zinc-air or lithium-manganese dioxide) batteries without high internal resistance?

For my wild life camera, I want a small cell that can provide 0.5W for 8 hours or more. It doesn't seems rechargeable lithium ion batteries have that energy density. I don't mind if the cell is non-...
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174 views

Why are the charge and discharge rate of Lihium Polymer Batteries different?

I have a 3S 1.3MAH Lithium Polymer battery with a 25C discharge rate, and a 5C charge rate.From what i know, the discharge rate is the rate at which the battery can be safely ischarged( i.e how many ...
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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 ...
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3answers
233 views

Can I swap any two lithium cells on an MP3 player / camera, etc? [closed]

Lithium batteries commonly have +/- and temp monitor connections. I'm pretty sure I can swap a 290 mAh MP3 battery with a 1400 mAh battery, it will charge very slowly. Can I swap the temp sensor ...
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1answer
530 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 ...
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0answers
365 views

Li-SoCl2 battery state of charge

I'm developing a data logger powered by Li-SoCl2 (http://www.100y.com.tw/pdf_file/02-SAFT-LS33600.pdf) battery and I have no idea on how to overcome the problem of estimating the residual charge of ...
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2answers
324 views

nexus 7 battery repurposing [closed]

I have just broken my nexus 7 and I was about to salvage the battery. I was thinking of using it maybe to power my raspi or arduino. My main question is how do I charge it? I was thinking of cutting ...
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1answer
319 views

What Lithium chemistry in phones' (now) 3.8V batteries?

I'm specifically looking for the discharge tolerances...can communicate with the charge controller on the phone and want to increase the discharge depth from 3.5V to say 3.1-3V for longer battery life....
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2k views

What do B+ and C+ mean on the wires of a Lifepo4 battery pack?

I bought this Lifepo4 battery pack. It came with its own charger. The seller told me the charger can be connected directly to the battery. There are 4 cables coming out of the battery: C+, C-, B+ and ...
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1k views

Confusion regarding the design of Lithium Ion PCB

From this site and many others, it seems to be universally recommended that a lithium ion battery not be discharged lower than 3.0 volts. Most actually recommend to stop discharging at around 3.3 ...
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1answer
7k views

Why do batteries leak/explode, and how can I prevent it? [closed]

I've been the owner of many-a-battery which blew up, particularly inside of flashlights. I've recently purchased a fairly-decent-quality flashlight, and I'd greatly like to prevent the battery from ...
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2answers
3k views

How to charge double cell lipo battery with single cell charger?

My setup is simple: I have this bluetooth module with a built in single-cell Lithium ion/polymer battery charger. I have this double cell LiPo battery and I also have an arduino nano that I will have ...
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2answers
300 views

Need to charge a lithium power pack from USB

I need to charge a small lithium power pack from a device that was originally charged using a 5v USB connection. The connector on the device is damaged so I need to charge the power pack directly. I'...
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1answer
412 views

Upgrade a cordless screwdriver (16.8 V) to Li-Poly [closed]

I'd like to upgrade my cordless screwdriver/drill to use lithium polymer batteries. Problem is, the screwdriver uses 16.8 V at the moment (14 NiMh 1.2 V cells). So, using lithium polymer batteries ...
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2answers
13k views

Will a device charger with higher current output necessarily charge an electronic device faster?

Charger specs Charger type : USB Charger Voltage : 5V Amp : 2 Amp Freq : 60 Hz Battery specs Type : Li-ion Power : 7.4 Wh Current : 2 Ah Discharge Voltage : 3.7 V Charging limit voltage : 4....
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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 ...
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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, ...
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1answer
198 views

What are the possible causes of sudden extremely high internal resistances in Lithium batteries?

Not a duplicate, just to separated a good question from Does a crude Li-ion 18650 battery have internal thermal (mechanic?) protection? Short history long: I extracted 6 18650 (Sanyo) batteries from ...
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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 ...
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1answer
409 views

Isolation between cells for battery charging & testing

I want to charge Lipo battery packs and possibly other chemistries too. Six cell packs for starters. But hope to handle more and less. Perhaps a lot more cells. For electric vehicles, skateboards, ...
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1answer
1k views

Boosting a Lithium Coin Cell

I made a board recently and just started checking it out yesterday. I used a typical lithium coin cell and a boost converter (Microchip MCP1640). With a battery plugged in I get no voltage out of the ...
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1answer
923 views

In circuit 2S Lithium Charging

I'm designing a board with a micro that controls a hobby servo. The circuit is usually powered from 12VDC but may be disconnected at any point, thus we have 2 lithium cells in series providing ~7.4V ...
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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 ...
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2answers
2k views

Charging phones via solar battery chargers

For a school project, I want to make a solar iPhone charger (specifically for the iPhone 4) and I've spent about a week looking up stuff all over the Internet, and I'm stuck for the hundredth time. ...
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1answer
532 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 ...
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3answers
113 views

Large battery, small component. Issues? [duplicate]

I have a basic question which I wanted to run by some better informed people than me. I'm planning on building a very simple circuit which takes a 12v feed from a broadcast camera and uses it to ...
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1answer
3k views

Lithium-ion rechargeable battery, shelf life

For Lithium-ion rechargeable batteries, that have never been charged, or been charged like 2-3 times at most, some 2-3 years back, and having since-then been in packaged condition, what should I ...
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1answer
52 views

What are some good methods for adding charging control/signaling for a docking wireless system with a rechargeable battery?

I'm working on a device that will dock to charge very similarly to a cordless phone. The dock outputs 5V DC, which is already very low risk, but I would prefer to add a control pin that turns on the ...
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1answer
750 views

Li-Po shield for Arduino with in-line recharging, soft-off and voltage protection?

I'm looking for a shield for my Arduino (or a breakout board that I can adapt for the purpose). It should have these abilities: JST connector for my single-cell battery. Over- and Under-current ...
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2answers
607 views

Regulator and charging in a portable device

There are quite a few similar posts on this subject but I'm a little confused about the best way to proceed in my specific project. All my previous regulators have been linear types (eg: 7805, LM317 ...
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3answers
259 views

replacing disposable lithium-thionyl batteries with rechargable lithium batteries?

I have a device that takes 2 disposable 3.6 V 1/2AA 1100 mAh lithium-thionyl batteries and I would like to replace them with rechargable ones. It is a device that measures angles in wireless mode, and ...
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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 ...
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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 ...
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1answer
5k 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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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 "...
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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 ...
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4answers
2k views

Creating Li-Ion charger with step up to 700mA from 500mA?

Canon apparently hasn't ever herd of something called USB-charging. The factory AC adapter for this battery(NB-5L) output's 4.2V's at 700mA. Most standard USB chargers output 5V at only 500mA. Would ...
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2answers
7k views

What are the tolerances for the maximum current a battery can supply?

After a lot of research and experimentation I have come to learn that the sentence "This is a 1.5V, 2800mAh battery" is entirely a lie. (i.e., the potential difference between the terminals of a ...
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3answers
3k views

Lithium Button Cell Characteristics

I am working on a small wireless sensor platform and trying to figure out power supply options. My power budget is approximately: .2mA constant, ~15mA for .1s every 2-3s, and 60mA for 10s very ...
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1answer
615 views

MAX1555 Alternatives

As you know, the MAX1555 is a popular single cell lithium polymer charger. It can take USB power directly, restricting the charge current to 100mA or so. Are there any other MAX1555 alternatives ...
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2answers
2k views

Can I drop 4.5 V to 3.7 V with a diode?

I have an RC helicopter with a dead 250 mAh lipoly battery with a voltage of 3.7 V. Could I use 3 button cells at 4.5 V and a diode with 0.7 voltage drop to power the circuit, which is somewhat ...
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3answers
3k views

Smallest lithium battery backup?

I'm considering putting a small lithium battery on my Super OSD Pro boards. The battery would provide power to the RTC. I am wondering how small can you get a battery? I don't really care about ...