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Questions tagged [lithium-ion]

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

2
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4answers
20k views

3.7V Lithium ion battery supply and Arduino Uno

So many people have asked questions related to mine already, but mine is not quite out there. So my question is I have a 3.7V Lithium Ion battery and I need to power Arduino Uno, which requires a ...
1
vote
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. ...
2
votes
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 ...
7
votes
2answers
297 views

How can a Li-Ion battery maintain decent characteristics for nine years?

Turns out Opportunity Mars rover is already working for nine years. It uses Li-Ion batteries to store energy acquired from the solar panels. In my experience Li-Ion batteries when recharged ...
6
votes
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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2answers
265 views

Lithium batteries worries [closed]

For the last few days I have had this strange fear that an external short circuit would cause an explosive fire of my laptop's Li-ion battery. Three questions: Is it true that lithium ion batteries ...
1
vote
1answer
190 views

Silicon-graphene battery energy density?

A startup called CalBattery is touting that their silicon-graphene anodes for li-ion batteries "will improve the anode specific capacity performance of lithium battery anodes by a factor of 3X." Will ...
5
votes
1answer
2k views

Why Trickle Charge a Deeply Depleted Li-Ion Battery?

I'm looking a this to write my own charging algorithm (really not looking to re-invent the wheel here) and have been referencing this article: http://powerelectronics.com/site-files/powerelectronics....
4
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2answers
2k views

Designing 14.8v Li-ion battery charger + 5v power regulator for Raspberry Pi (of other 5v device)

The RasPi requires a steady 5V and to this end I build a power regulator circuit using a LM2576T, similar to the one on page nine of the latest MagPi magazine. This works great with an external ...
7
votes
2answers
282 views

Setting a part's VCC slightly lower than board's supply voltage

I'm interested in using the undervoltage detection feature (in addition to the primary function) of this chip. This IC draws 6 uA (microamps), and accepts any VCC between 1.6V and 5.5V. The ...
4
votes
2answers
1k views

DC-DC converter with 200V output?

First of all, I'm a mechanical (robotics) engineer, so I do not know much about electric power systems. I'm making a mobile robot that should have electrical motors and drive system. The problem is ...
6
votes
2answers
5k views

3.3V Power Failover Supply with USB Li-Ion Charger

I am currently designing a "3.3V@500mA Power Failover Supply with Integrated USB Li-Ion Charger" for a uC project. I want the circuit to draw power straight from USB power when available & switch ...
3
votes
1answer
577 views

Auto-charge 8.2V Lithum-ion battery pack

I am planning a device consisting of a load, a battery, and an external power source. The idea is that the battery powers the system until the external power is plugged in -- then, the external ...
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 ...
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 ...
5
votes
1answer
22k views

Battery management circuit for Nokia BL-4C / 5C Li-ION batteries

Nokia BL-4C / BL-5C are 3.7V, 700-1000mAh (variants) Lithium-ion batteries, which are available in abundance and at very low cost ($4 - $7 a piece), since these are used in entry level Nokia phones, ...
3
votes
3answers
2k views

Lithium Ion charging schematic

I am using the MCP73831 along with a Lithium Ion battery to supply an Arduino Mini project. Is it safe to supply my project directly on the battery? Or should I use a transistor to protect the project ...
6
votes
1answer
1k views

What would cause a watch battery to leak?

I am using a CR1220 Lithium Manganese Dioxide battery to keep a real-time clock chip running during periods when batteries are removed from a device. The battery is only connected to two pins on the ...
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. ...
10
votes
3answers
1k views

Is there any sense in this technique for charging Li-Ion batteries?

This is a replication of this question on Android SE. I feel that it is in fact an electrical engineering question, since it covers batteries behavior in details. Basically there's a claim that the ...
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 ...
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 ...
0
votes
2answers
2k views

How many affordable lithium polymer batteries would it take to safely jump-start a car?

I have a couple of these incredibly powerful 12V battery packs and I got thinking about how feasible it would be to MacGyver an engine starter out of them. These things are rated on the package to ...
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 ...
0
votes
1answer
670 views

how to design switching regulator in battery operated device?

My device consists of ATMega, GPRS modem and sensors. Modem occasionally hangs and I need to reset it from mcu. The whole system is powered from li-ion battery. I can't find any switching DC-DC ...
6
votes
2answers
10k views

Why are Li-Ion battery so much safer than lead-acid?

Recently I asked how to charge a (lead-acid) car battery at home and looks like the answer is very dangerous, don't do it unless you really really have to. Meanwhile people charge Li-Ion batteries of ...
8
votes
2answers
909 views

Properly charging and discharging Lithium cells during battery testing?

I'm working on some software that automates charging and discharging battery cells to generate discharge curves. I have a few concerns about properly charging and discharging of lithium-ion / lithium-...
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 ...
0
votes
1answer
761 views

Using Dynamo Pull Strings to Charge 9 x 3.6 V li-ion batteries @ 120 mAh in Series

This question has several parts. I ordered this pull string operated flashlight --- http://bit.ly/t1lZF1 --- which charges this coin cell battery --- 3.6 V lir 2450 lithium ion battery 120 mAh --- ...
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 ...
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
710 views

Using old notebook battery to power electric screwdriver

I have: Dead notebook with live LiIon battery (HP HSTNN-CB50): 14.8V, 8 x 2500 mAh 18650 LiIon cells. Rated at 73 Watt-hour. I haven't managed to open the battery pack yet, but it's clear from the ...
5
votes
1answer
812 views

How to test internal resistance on small lithium polymer cell?

I'm coming from a computer science background, and will be writing some software to automate battery testing. I have background in math, but little to none in physics or electronics. Please consider ...
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
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 ...
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....
7
votes
4answers
5k views

How do I charge a commercial lithium battery with solar cells?

I have a digital camera (Panasonic DMC-FT1) and will be going multi-day hiking with it soon. I'm looking to build a solar charger for it using something like this and strap it to my pack. Does anyone ...