Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [lithium-ion]

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

Questions regarding Li-ion (lithium-ion) cells and batteries of all formats (pouch ("LiPo"), 18650 and other small cylindrical, small and large prismatic) and chemistries (LCO/cobalt, LFP/LiFePO4, NMC, LTO/titanate), including proper charging and usage.

1406 questions
48
votes
5 answers

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 their discharge cycle. My circuit (running at…
boardbite
  • 4,892
  • 11
  • 47
  • 73
29
votes
1 answer

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. However it's completely unclear which kind of…
vdudouyt
  • 391
  • 1
  • 4
  • 7
24
votes
6 answers

Why are Alkaline, NiMH, and Li-ion AA measured differently (mAh, mWh, etc)?

Looking around Amazon, it seems that different types of batteries are measured differently: Does anyone know why? Li-ion are measured in mWh 1200mWh ALTIZURE (Cheap-Os) 3200mWh Deleepow 3000mWh AmpTorrent NiMH are measured in mAh 2000mAh…
coolaj86
  • 417
  • 4
  • 12
23
votes
3 answers

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 by a corresponding Microchip charger IC. What I am…
boardbite
  • 4,892
  • 11
  • 47
  • 73
21
votes
3 answers

Lithium Battery Protection Circuit - Why are there two MOSFETs in series, reversed?

I was studying a battery protection chip and reference circuit (below) commonly used in cell phone Li-ion batteries, and am confused by the two MOSFETs in series on the negative terminal EB-. According to this question, I now understand that MOSFETs…
Ryan Griggs
  • 2,596
  • 2
  • 30
  • 53
21
votes
5 answers

How to safely dispose of a damaged lithium ion battery?

I replaced a lithium ion battery in a device and the old battery is swollen/bulging but no otherwise damaged. My municipality (NYC) requires many retailers to accept batteries or devices containing them but I am concerned that none of them can…
Kenny Evitt
  • 339
  • 1
  • 2
  • 11
19
votes
2 answers

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 manufacturer follows to say that it reduces the…
sharptooth
  • 12,374
  • 26
  • 83
  • 144
18
votes
4 answers

How do rechargeable 1.5 V batteries work?

Until the last years, my knowledge was that the rechargeable analogue of the 1.5 V batteries have only 1.2 V. This greatly decreased their usability (many devices did not work well with 1.2 V). The cause of this lower voltage was chemical and it was…
peterh
  • 638
  • 8
  • 25
18
votes
4 answers

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 when the device is needed again after a year) or…
Vi0
  • 517
  • 1
  • 5
  • 14
17
votes
6 answers

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 3.6/3.7V li ions work the same standard way with a + a -…
Sam
  • 515
  • 1
  • 7
  • 17
17
votes
6 answers

How to solder wires on Li-ion cell phone batteries?

I am making a obstacle avoiding robot and wanted to power it with mobile phone batteries. But wondering how to solder wires on battery correctly for no inconvenience. p.s. I am a new arduino enthusiast.
geeky me
  • 289
  • 1
  • 2
  • 5
16
votes
6 answers

Is draining a Li-Ion to 2.5 V harmful to a Li-ion cell?

I am running one of my projects from two 2000 mAh Lithium Ion cells 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, and when I checked the voltage on the cells, they…
Patrick Cook
  • 275
  • 1
  • 2
  • 11
15
votes
5 answers

How does laptop 'limit battery charge' work?

Charging while using the device reduces battery lifespan*. The charger gets confused in the Constant Current Phase because of the additional current drawn by the device. Windows OS and some laptop firmwares offer the option to "limit charge to 80%".…
Vorac
  • 3,091
  • 5
  • 29
  • 52
15
votes
2 answers

Is it safe to use a Li-ion battery after being completely discharged?

I've got a Li-ion battery (LGDBHE21865 Q153F022A2) that has no protection circuits (as far as I know). The battery can support a 20 A current. I used it in my vape device some time in the past, but then the battery was lying on the shelf for a long…
Zhuravlev A.
  • 253
  • 1
  • 7
15
votes
5 answers

Is it safe to discharge Li-Ion to 0V?

first of all: I know that a completely discharged battery is damaged permanently. I know it experiences irreversible chemical changes. I know it might blow up if you try to charge it. But that's not at all relevant to my question: Is it safe to…
xsrf
  • 461
  • 1
  • 3
  • 7
1
2 3
…
93 94