Li-ion

Does anyone know how i can make the lithium-ion for my laptop last longer, if you have any ideas of suggestions or ideas please tell me!

Topic by rickick 12 years ago  |  last reply 11 years ago


How can you live in a world full of lies?

How can we?????

Question by 10 years ago  |  last reply 9 years ago


So apparently...

After taking a devastating kick to the throat CO my little nephew (yeah, he's gonna be quite the Steven Seagal), my voice pitch has increased about an octave and my NY accent is totally gone (not that I'm going to miss it). My sister says it's temporary, but I can only hope. This happened Thursday of last week, and there's barely any improvement. If anyone else has taken a blow like this, please tell me about your experiences and the result. Thanks, DrWeird

Topic by DrWeird117 8 years ago  |  last reply 8 years ago


Li-ion vs Li-poly battery? Answered

I m currently searching for a battery that has an high discharge rate and I found these two:   Li-ion: http://www.ebay.com/itm/New-DC-12V-Portable-9800mAh-Li-ion-Super-Rechargeable-Battery-Pack-2-/180832863362?pt=UK_Sound_Vision_Battery_Chargers&hash;=item2a1a7a8482 Li poly: http://www.ebay.com/itm/5200MAH-6S-50c-MAX-100C-22-2V-Helicopter-Airplane-LIPO-PACK-BATTERY-BEAST-Nano-/360510967745?pt=US_Character_Radio_Control_Toys&hash;=item53f020cfc1 I need 40 volts so If I buy the Li-ion y will buy 4, and 2 of the Li-poly. I want to know which battery will be better for an high discharge for about 3 seconds, and about 15 times. I will use the batteries to create an high powered electromagnet to move steel. Thanks

Question by Kurt Gerhard 6 years ago  |  last reply 6 years ago


Li-ion battery

Whats the best way to reclaim some of my lost battery life from my laptop? Or is it imposable?

Topic by steven07 12 years ago  |  last reply 12 years ago


Li-ion Battery

So I want to upgrade my psp battery, but all the cheap batteries i have seen on Ebay really discourage me from buying one. So, i have come up with my own solution; buy a low capacity battery, and switch out the cell. the problem is, that i don't know where to get such a cell! I want to order for a legitimate company, so that i cannot get ripped off, buying a 500mah battery claimed to be 3000mah i need >2000mah square cell approximately 3.5x1x5.2 CM Thanks!

Topic by Sandisk1duo 10 years ago  |  last reply 9 years ago


Simplest Li-ion charger?

What is the simplest circuit that will charge a single Li-ion cell? It doesn't need to be fast - can I just trickle-charge the whole way? Does it need to be a constant current supply? vik

Topic by askvictor 10 years ago  |  last reply 10 years ago


Li-ion battery charger

I have taken apart a cheap disposable phone. i got a better phone because this one died. the charger still works though. i have 3 nokia 3.7v battery's. all the same. could i use this to charge the battery's in parallel.

Topic by chrischavez 10 years ago  |  last reply 9 years ago


ReHab for Li-Ion Batteries??

Is it possible to get more life out of Lithium Ion batteries that no longer hold a charge? These things are great when new, but for the cost, they seem to crap out in a yr or 2. Specifically, 18v Ryobi cordless tool batts.

Topic by Toga_Dan 4 years ago  |  last reply 4 years ago


Li-ion drill charger?

Hi So I've got a cordless panasonic drill for which the battery charger has been lost. I've been googlin' for a DIY way to make my own li-ion charger for the battery pack, but since these batteries seems pretty sensitive about the way they're charged, and none of the "how to:s" have focused on drill-packs (this one is 14,4v, 3,3Ah) I thought I'd ask the good people here on instructables for a pointer or two. :)

Question by Kejnao 6 years ago  |  last reply 6 years ago


Li-Ion battery pack

Hi, I have 4x PANASONIC CGR18650CG LI-ION BATTERY 2250mAh 3.7v.  I have connected them in series and it gives around 14v. My internet router is working on 12v 500mA. Is this battery pack too much for that router? I was thinking to use that battery pack as backup for my router when there is no electric power, because it's winter and every few days there are problems with power. Thanks!

Topic by AdvanŽ 1 year ago  |  last reply 1 year ago


Leave LI-on battery turned on?

Hello! I bought a li-on battery ( http://m.ebay.de/itm/281697770691?varId=580703135130) and it has this little switch. I want to build a boombox and dont want to open it everytime to turn it on or off. I also dont want to rip the switch appart because i sind want to destroy the batterypack. Can i leave it turned on and place a switch between the circuit and the batterypack? Or will i destroy it if i leave it on all the time?

Topic by Unirox 3 years ago  |  last reply 3 years ago


Recharging Li-ions in parallel

Hi I am new to rechargeable cells.For my application, I need 2 Li-ion cells (LIR2032) in parallel to increase the capacity. I am using NCP1835B charger IC . Can I use the same IC to charge them while they are in parallel. Is there any extra protection circuitry to be used? What happens if the 2 cells are at different voltages initially ?Will the trickle current bring one of the cells to proper voltage while not affecting the other one?

Topic by anu_11gem 12 years ago  |  last reply 12 years ago


Balance charging li-ion ?

So I bought a replacement battery for a project. I tore down all the casing and got 6 18650. But I want to charge those batteries using the same protection circuit that was inside the casing using laptop battery adapter. Can someone tell me what are the terminal should i connect and how i connect? So far i found using multimeter that P-, P- is negative and P+, P+ is positive and there is no switch. The voltage can be checked directly. The circuit and battery is from Dell 1525.

Question by SaurIMX 5 years ago  |  last reply 5 years ago


What is the difference between Li-poly batteries and Li-ion batteries? Answered

I can't figure it out.

Question by bowmaster 9 years ago  |  last reply 5 years ago


How to store/ conserve unused Li-ion/ Li-po batteries?

Have several unused Li-ion and Li-po cells: My laptop battery, only used when working outdoors (is in summer). Half broken MP3 players, phones, a broken RC helicopter and some larger batteries.  Some might be useful one day in a future project. As I understand these cells slowly deteriorate even when not in use.  What is the best way to keep them in shape? Perhaps dry storage in a freezer? Charge them occasionally or have them uncharged?  Are button cells Li-ion cells?

Question by BobS 8 years ago  |  last reply 8 years ago


Solar Powered Li-Ion battery?

I have this Carrera RC car, and it runs on a Li-Ion battery. Li-Ion battery: 7,4 V – 900 mAh It is the Red Freezer Watergun Car, and the battery is on the bottom of the car. I wondered if anyone knows how i could cut the recharger wire (8,4 V – 500 mA) and attach it to a solar panel on the top of the car to constantly charge the battery. 

Question by articz82 6 years ago  |  last reply 6 years ago


Charging Li-Ion 3.7 V

Just bought a 3.7v  batt for my new laser (class 3b,  200mw)  The batt place had no charger for it. Hoping it will arrive in time for show next weekend. If charger doesn't arrive, any suggestions for charging Li-Ion without overcharging/blowing up batteries?

Topic by Toga_Dan 4 years ago  |  last reply 4 years ago


Charging Recycled Li-ion Batteries

I have busted mp3 players that I've already thrown away but decided to keep the Li-ion batteries in them for future use. Now i tried to connect them to LED's to turn into flashlights and they worked perfectly. Now the main concern is if i will use them as batteries for my flashlight how will i be able to charge them? Can I replace the jacks of the mp3 players' original charger with bulldog clips and just connect them to the terminals of the Li-ion batteries to charge them or do i need to connect a simple circuit for the Li-ion batteries?

Topic by rainrose 7 years ago  |  last reply 7 years ago


HELP please!! with Li Ion battery

1 st question: i have a 7.4v 2200mA li ion battery. my ip camera takes 5v 2amps what color resistor should i use and how many ohms? 2nd quesiton: i have a class 2 battery charger 12 volts 300mA is it good to charge my 7.4v li ion battery?

Question by dwstar79 7 years ago  |  last reply 7 years ago


Li-ion battery charging question

I'm new here so hi first. Now to the question I've been making a portable wii lately and I've gone quite far, but I'm stuck at the power. So I've got two 20000mAh mobile batteries (10000mAh 4.2V x2 in parallel for one mobile pack) i was planning to connect the batteries in series to get the required 12v+ power to get the Wii running . Since this is a mobile battery it has a charging circuit for the battery in parallel . I was thinking how to charge the batteries in balance (in series) . It's quite confusing ,any help will be appreciated!( There is very little information of the batteries inside the pack, it only says [10000mAh Max 4.2V])

Question by WanjiangW 3 months ago  |  last reply 3 months ago


use li-pol battery for flashlight

Hi every one im glade i found this amazing forum. its realy useful. i get a rechargeable battery for iphone from a friend. the board charge the battery but its not charge the phone. i dont wanna to fix this one. i want to use this battery to run my flash light its need four AA battery. can u help me please how to designe a board its charge the li-pol battery and run my flash light. but i dont wanna to destroy my light. thank u. this is the pic. [img]http://www2.0zz0.com/2014/04/26/17/719978584.jpg[/img] [img]http://www2.0zz0.com/2014/04/26/17/303737358.jpg[/img] [img]http://www2.0zz0.com/2014/04/26/17/871414939.jpg[/img] [img]http://www2.0zz0.com/2014/04/26/17/504330775.jpg[/img] [img]http://www2.0zz0.com/2014/04/26/17/349653615.jpg[/img]

Topic by mjd_76_09 5 years ago  |  last reply 5 years ago


Li-ion 5 pin, pinout?

Good Day Fellow TinkerersI have a battery that came out of a Android Tablet that i want to use for another project.It has a cuircuit board attache to the top which i would assume is a over/under charge protector and it has 5 wires coming off of that. 2 x Red, 1 x White and 2 x Black.The two black wires are connected to the same pad on the "protection circuit" and the two red are connected to the same pad. The white wire is on a separate pad i.e. 3 pads, 1 with 2x red, 1 with 2 x black and 1 with 1 x white.I figure the Red would be positive and the Black negative and then i would assume that the white is the Thermistor connection.My Question :How do i connect this externally from the tablet to charge? I figure red and black are the usual, but how do i connect the white wire?Thanks in advance for any help :)

Topic by GhengisKhan1981 12 months ago  |  last reply 11 months ago


Do I "Have to" use an expensive li-ion charger for li-ion battery packs?

Overview I am building a 7.4v Li-ion battery pack (7200 mAh) with a PCM of course and i usually use my li-ion / liPo charger but i was curoious if their was another way.  Details this battery pack will be installed in a portable gaming device and i want it to have its own wall charger. But i dont want it to take 6 hours. Ideas I want it to be reliable and I want it to charge fast. Most li-ion wall charger units for 7.4v only charge at 1.2A max, and charge at up to 8.4V. (And are like $25+) PCM can handle much higher, up to 8A rate Batteries are Rated up to 3.5A rate Ultimate question If I purchased 3 regular everday wall chargers, rated at 7.5V @1A (for $5 ea) and ran them in parrallel in a nice  enclosure running one charging plug, (hypothetically it "should" rate; input: 120V, output: 7.5V @3A).  Could i use this to charge the for-mentioned Li-ion 7.4V 6400mAh battery pack in just over or around 2 hours???? Or is this not feesable for some other reaon???

Question by supramp 7 years ago  |  last reply 7 years ago


Li-ion battery charging help please?

Hi, I have a couple of Li-ion batteries hanging around (one from an old mobile phone and one from an ipod mini), so I was planning to make an LED torch or something out of them. Anyway, can I use an old li-ion battery charger from a camera to charge them without it blowing a hole in my desk? Or whats the best way to charge them? Thanks!

Question by Ben Charles 10 years ago  |  last reply 9 years ago


Highest capacity Li ion 32650 and 26650

We now have the highest capacity Li ion 32650 3.6V 5500mAh, and 26650-4500mAh, 500~1000mAh higher than most in market. if anybody is interested, please contact us by ruy@gebattery.com.cn

Topic by Ruy Liu 9 years ago


Connecting Two Li-Ion Battery Charger? Answered

Hi, can I connect this(please see image) two Li-Ion battery charger in parallel, to increase the amp. Thank you. Regards. Sorry image not uploading. Here is the link. https://i.ebayimg.com/images/g/IlYAAOSwJwpZ0KWd/s-l500.jpg

Question by Lima79 1 year ago  |  last reply 1 year ago


Motorola Bluetooth charger to charge 3.7v li-ion batteries Answered

I have a little bluetooth charger that outputs 5.0V and 550mA, am I able to charge 3.7v li-ion batteries with this?

Question by vallka 6 years ago  |  last reply 6 years ago


Can I use a cell phone to charge any 3.7v li-ion battery?

I want to use a cell phone to charge 3.7v li-ion batterry that are shaped like a AA (same as laptop batteries)

Question by Sincere 9 years ago  |  last reply 9 years ago


Li-ion battery stores a weeks power for a home, from Panasonc

Www.popsci.com/science/article/2009-12/panasonic-will-market-li-ion-storage-battery-home-use-2011 As its a breach of copyright to post more than the link to the site, I am just saying that this device is what everybody needs if they want to be independent of electricity suppliers.

Topic by Lateral Thinker 9 years ago  |  last reply 9 years ago


li-ion nokia battery charging with original charger, but WITHOUT THE PHONE?

Can anyone help to give some very basic answer i guess..Is it possible to charge the nokia phone battery, outside of the phone with the original wall charger connected to its + and - pins? I need this for my small LED project which i need to use li-ion battery LED flashlight. Thanks A lot.

Question by cdroman 6 years ago  |  last reply 3 years ago


How to charge a salvaged Li-ion battery pack?

I've recently salvaged a 11.1 V Li-ion battery pack from an old laptop battery.  Details : Voltage           :  11.1 V  (  ~ 4400 mAh ) Cell                 :  6 x Samsung 18650 22f  cells  (  3.7 V  and 2200 mAh ) Arrangement  :  3 packs in series , each pack having two cells in parallel  The charging circuit is intact.  How should I safely charge them? I'm well aware of the hazards related with improper charging of Li-ion batteries.  Can anybody please suggest some ways to charge it ? any tips ?   I need to know the proper procedure to safely charge (and discharge ) a Li-ion battery and what does a "protection circuit" do ? Thanks !

Question by electro18 4 years ago  |  last reply 4 years ago


In the "1 man lies and the other tells the truth" riddle, couldn't you just ask one a simple math question? Answered

IE, a question YOU know the answer to??

Question by ajleece 7 years ago  |  last reply 5 years ago


how to make 12v battery from 18650 li ion batteries?

Hi, I have this led strip  http://www.supernight.cc/supernight-tm-5m-16-4ft-smd5050-rgb-double-row-600-leds-tube-waterproof-led-flexible-strip-light-12v-120led-m-strip.html Working Voltage is 12VDC. Working Current/meter: 0.8-1A the strip is 5 meter. 18650 x4 = 14.4 v 18650 x3 =10.8 v How can I make it work with 18650 li ion batteries? And how many battery must I use and how can I do that? I think that I need driver or booster to get a stabil 12v! work-time I need 5 h

Question by Cr77777 2 years ago  |  last reply 2 years ago


How do I charge Li-ion Batteries?

I have lots of old Li-ion batteries and I want to use the for a project. I want to put them all in parallel in a big pack and I need a charger that can charge them in a reasonable time. Can I just put 3.7v straight into them, with a current limiter of course, or do I need some special circuity with transistors etc. 

Question by makincoolstuff 6 years ago  |  last reply 6 years ago


How to Charge 7.4v Li-Ion Battery Pack with CCCV

For one of my project i need to use 7.4V Li-ion battery of 2200mAh, Now i need to charge this battery pack efficiently. I'm searching for a charging circuit for the same but what ever i'm getting is a 3.7v charger or a charger not following CCCV methord. as mentioned in following link Link: http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries Please suggest me a way to charge and discharge my battery in a better way.

Topic by ASHMILH 1 year ago


Manage a single 3.7V Li-ion cell for 5V load? Answered

This is a 3.7 V 10Ah Li-ion cell. Load requires 5V 1A. Can you give me a general idea to have something like this - 1. Power the load from 1 single cell 2. When connected to external power source, like USB, disengage the battery and power the load from USB delivering 5V 1A, and simultaneously charge the cell but at 5A. Thanks.

Question by arjunmenon 4 years ago  |  last reply 4 years ago


Emergency charging car battery with 4 li-ion cells, possible?

Hello, I'm trying to make a DIY emergency charger for my car battery. Is it possible to use 4 li-ion cells in series? That will be 4x4.2volts at full charge of the cells. I think i should limit the voltage and also the current with some sort of circuitry. Considering that I will use this when the car battery is almost fully discharged, there will be a huge power draw. Any suggestions?

Topic by rcs-al 6 years ago  |  last reply 6 years ago


How to Charge & Use 2 12V DC 15000mAh Li-ion Battery Together...???

Hello Guyz...  I'm New Here, I have a question..!!  How to Charge & Use 2 12V DC 15000mAh Li-ion Battery Together, That's Mean I want Use 2 12V DC 15000mAh Li-ion Battery Because For more Capacity 15000mAh X 2= 30000mAh But I want Charge This Two Battery at one time at one charger 12V DC charger...  And My output volt required 12V DC..  So How its possible.....?? Please............. Please.......... Please........  Help Meeeeeeeeeeeeeeee...........!!!!

Topic by Shilon 5 years ago  |  last reply 5 years ago


How can I recharge 3.7v Li-ion batteries from cellphones... if I have 3 of them attached in a serial array?

I'm trying to turn a cheap pc-speaker set into a battery operated set. I have a lot of 3.7 Li-ion batteries from dead cellphones and I want to solder them into a serial arrange to get 11.1v. The question is... how to recharge them? is it safe to recharge with a 12v dc adapter? any other idea? Thank you!

Question by =PK= 9 years ago  |  last reply 9 years ago


Advice building a li po USB battery pack?

Hello, I have 8 of these batteries - they are li po 3.7v 1100mah. each one is good and shows 4.16v to 4.17v on a multi meter. my question is how can I connect these together to make a battery pack I can use to charge my phone at festivals? links to ebay items would be a great. would connecting them all in parallel to a USB charge circuit work? advice would be a huge help. Thanks! Battery image = http://i67.tinypic.com/iz0rk0.jpg

Question by robstarboy 3 years ago  |  last reply 3 years ago


Lithium Ion protection circuitry?

I was wondering.... The protection circuit for li ion cells in phones; is it a sort of regulator for the battery when charging? Or does it just stop the cell from being drained too far? I was wondering if I could use the circuitry from the prismatic li ions found in mobile phones for a 18650 battery....will the difference in capacity be a problem?

Question by .Unknown. 8 years ago  |  last reply 7 years ago


Power 5V 1A load using single 3.7V 10Ah li-ion cell, and charge it differently

This is a 3.7 V 10Ah Li-ion cell. Load requires 5V 1A. Can you give me a general idea to have something like this - 1. Power the load from 1 single cell 2. When connected to external power source, like USB, disengage the battery and power the load from USB delivering 5V 1A, and simultaneously charge the cell but at 5A. Thanks.

Topic by arjunmenon 4 years ago  |  last reply 4 years ago


Best way of charging Li-Ion batteries in series?

Hello. I've been working on a speaker project for the last couple of days, but I've now ran into a problem with the speakers battery. I have 4, 3.7 volt 9900mAh batteries, that I want to connect in series to achieve 14.8 V. What is the best way of charging these batteries in series, while still being able to draw power directly from the batteries? Also what amp should I use to charge the batteries as safe as possible? Would something like this be good for that?

Question by 1000Reasons 3 years ago  |  last reply 3 years ago


Series Parallel 4S2P Li-Ion Battery Pack

Hey guys,I'm busy making a boombox*, my first version had an old small car battery inside which obviously weighed a tonne!Looking to make the switch to Li-Ion.I have already purchased for the battery pack:8 x Samsung 30Q Li-Ion batteries (3000mAh - 3.7V)BMS board I found online (CF-4S30A-A)2 x 4S 18650 Battery Holders.I'm unsure how to go about setting up the batteries and balance cables etc. Need the 4S2P configuration for the Voltage.I want to expand this in the future by increasing to maybe 3P or 4P (depending on how much space I'll need in my boombox).I have watched multiple YouTube videos but sick of watching 15 minutes of somebody soldering. I understand the safety aspects of Li-Ion.*I know this project could have been done with Raspberry Pi or Arduino but the rest of the guys who will use this would not be familiar with hence why I went with a Car Stereo.If anybody has any criticism, I welcome it but make it constructive!(I know I'll get a roasting for the terrible MS Word wiring diagram I made)

Question by alexmallaburn 8 months ago


Repurposing a cell phone Li-Ion battery for a project?

I have a quick question. I made myself an electronic cigarette that runs off of AAA batteries. It works quite well, it has a heavier hit than those commercial e-cigs like Blu. The only problem is, probably because I keep smoking it like a regular cigarette, the batteries don't last long. There may be another underlying reason, but I'll deal with that later. I have three 3.7v Li-Ion batteries laying around that I used to use with my HTC G2. My question is: could I repurpose these batteries as a power source for my e-cig? I've seen some articles on repurposing them, but they don't exactly explain the method. Does it only require making the positive and negative contact as noted on the battery? So...out of four contacts, I'd only be using the two?

Topic by krisley 6 years ago  |  last reply 6 years ago


Re-purposing Cel-phone Li-ION batteries?

Excuse me Please: I have a rather advanced Q on the re-purposing of Li-ION batteries. {history} the tiny battery within the SanDisk Sansa, I found to have a deplorable duration. So in disassembling the Sansa, I discovered it had a seemingly standard 3 pin Li-ION battery (red, green, black). Since a celphone of mine recently died, which I retained it and its battery, I decided to wire the albeit, larger, battery into the Sansa. I was gratified in the the Sansa worked as expected, but worked for literal contiguous DAYS at a charge!! (seems I had forgotten to turn it off in coming from the gym, to return to it the next day and it was still playing!) Now, my conundrum: due to the change in cellular tower technologies, and being forced to change to the newer "G" phone, I have an abundance of batteries, to which I continue to collect for myself and friends Sansa players with rewired batteries. In that the Motorola BQ-50 battery has four(4) pins, which are suggested as the following: pin 1 is battery + pin 2 is a communication line back to the phone pin 3 is a temp line back to the phone pin 4 is gnd pins 2 and 3 are used to tell the phone the charge condition of the battery and when the charge cycle is complete. would anyone here have the deeper electronics knowledge to advise me which pin of 2 or 3 can be omitted and still allow the battery to be charged via the USB like the original 3 pin battery? Thank you kindly for your time and knowledge. CAH

Question by Ceyarrecks 3 years ago  |  last reply 3 years ago


Replace just 1-2 bad li-on cells?

I've got a fairly new DeWalt 20V Lipo Battery pack that got a bit of water inside it's case, causing 1 of the 10 cells inside to go bad. Pertinent info: * Battery pack is configured as 5x2 (5 series stages of two parallel pairs each) * Other cells are in near-new condition. * OEM Factory battery exact matches are rare and quite overpriced.  (1500mah x 15A discharge rate @ $10-20 shipped.) * Due to improvement in battery tech, I can get batteries that outperform OEM in every spec for 30-40% of what the OEM costs (2500mah x 20A discharge rate @ $4-6 shipped.) * The battery pack is always charged on a cell-balancing charger. Assumptions:  (Correct me if I'm wrong here, especially on the 2nd one) * The partner cell to the dead one is now suspect, due to being undercharged (down to <.1V)  by it's dead partner. * I should be able to just replace the bad cell and it's partner with the higher spec'd batteries and it shouldn't be a problem Is this workable, or will having non-identical cells for 2 of the 10 cells cause problems?  (I'm totally fine with the pack only being as strong as the weakest link, and only getting OEM performance out of the replaced cells.) I'd rather not have to replace all 10 cells, but I'd rather do that than replace 2, and -then- have to replace all 10 because the combination didn't work.

Topic by SvdSinner 3 years ago  |  last reply 3 years ago


Help me designing charger for Li-ion 9.volt battery?

Hello all.... need help !! circuit diagram for making charger for my li-ion 9volt- 600ma battery ...  I want to charge at 60ma ... how to limit current here (constant current) (I have 12v  & 18v 1.5amp power adapter) in general how to limit current in Circuit? (which components to use ??) Thank you :)

Question by 60ma 3 years ago  |  last reply 3 years ago


Whats the proper way to wire a Li-ion rechargeable battery?

I have a Li-ion battery that I want to use to power mini portable speakers. I want to enclose the battery into the portable speaker's box and have a port drilled into it to recharge the battery. So what is the proper way of doing this? The Positive + and negative - of the battery is connected to the speakers right now, so would I just cut into the positive and negative and add my charging port? (I have the correct charger for the battery by the way) Hopefully I explained this well enough for someone to help, thank you!!

Question by Zebrah 6 years ago  |  last reply 5 years ago