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!
Posted by rickick 11 years ago | last reply 11 years ago
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!
Posted by Sandisk1duo 9 years ago | last reply 9 years ago
Remeber a while ago I said I wanted to make some cool high voltage weapon in the shape of a gun? Well I've dicided to make an ion ray gun! The only problem is that I don't want to pay for plans (that's just not right, half the time they probably jip you). The closest thing I've found is this:http://www.freeinfosociety.com/site.php?postnum=250but that doesn't help me with saftey procosions (sorry, having a bad spelling day).Basically I need help for the schematics and the safe way to build and handle one. I don't want a wimpy one either, I want a medium power one, like do stuff from 10-20 feet or something like that.Oh and if possible, skip extra circuits by using something like this:http://www.goldmine-elec-products.com/prodinfo.asp?number=G9695I also don't mind making voltage multiplier circuits.If everything works I'll make an instructable out of it!Oh, and tech-king, you can use the sign now.
Posted by guyfrom7up 11 years ago | last reply 6 years ago
I've been trying to design a compact propulsion system and have considered ruling out liquid fuel chemical engines due to bulkiness (the fuels are surprisingly heavy, go figure). I've read about ion propulsion and its use in spacecraft because of its high efficiency, at least in a vacuum. However, in such cases the thrusters are rather large and provide a relatively small amount of thrust, usually less than one newton per tonne. Now I'm certainly no rocket scientist and know little about the efficiency of thrust, but to me that doesn't exactly seem remotely powerful, especially considering there are roughly 4.5 N to every pound. Anyway, regardless of the exact fundamentals involved, I have a limited amount of space here so I'll keep it brief. What I would like to know is if a small ion thruster could be made that can reasonably lift a ~40lb weight a few inches off the ground. I've seen compact ion thrusters built by amateurs, so I know they can be built in small sizes, but no clear demonstration of their power has been shown. I need to know if what I'm asking can be done, and if so, how. And please, for the love of all that is holy, I want serious answers only.
Asked by TibbyD 5 years ago | last reply 5 years ago
I've been reading up on negative ion generators, and I was going to get one (they're only 12.95), but I was skeptical on safety. 15kv (!) going through my body does NOT sound safe. Yeah, it's probably low current, but 15kv...is alot. How is it on pain? Could it...kill me? I don't know about you, but I only have one life, and its goin good right now, so I don't really want to get rid of it.Does anyone have experience ith these? Yes, I know about the one instructable about rigging it with your doorbell,, but even they mentioned -and I quote- "...a pretty nasty shock...", so what exactly am I dealing with? ...be specific...be specific...Oh, and I was thinking of the 12vdc one. Also, will it jump (the spark), to ANY grounded metal thing?
Posted by John Smith 11 years ago | last reply 6 years ago
Dear all Please help me to modify this circuit for use only led (meter is removed) Thank you so much. lam
Asked by lam 4 years ago | last reply 4 years ago
Asked by Intercom D 8 years ago
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.
Posted by chrischavez 10 years ago | last reply 8 years ago
I'm not at all techy, but I need an ion generator for a kit that I sell and I dont want to pay the huge cost for the hobby kits. Can anyone help me with a simple way to build one my self, I want it to be 12v battery powered, and small enough to fit in a 4 in pvc pipe 6" long. I want it to blow out on one side with its own ion wind. I need to keep the cost to about 12.00 a unit. Any ideas would be appreciated. I can solder and read schematics, but I've never built a board before. If someone could build these for $12, we might be able to work a deal. silo
Asked by silosounds 8 years ago | last reply 8 years ago
Personally, I think anyone dabbling in the field of "free energy" is off their rocker, but this idea seems to make sense. I believe the concept is used today in modern MRI machines. I would like to see someone who has spare time (and money) take a crack at it :)http://www.pureenergysystems.com/os/IonSourceBeamProjector/plans/firstdraft.htm
Posted by nuncoop 11 years ago | last reply 11 years ago
I want to use a cell phone to charge 3.7v li-ion batterry that are shaped like a AA (same as laptop batteries)
Asked by Sincere 9 years ago | last reply 9 years ago
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. :)
Asked by Kejnao 6 years ago | last reply 6 years ago
Hello Everyone! I am planning to make a rear bike light, which has rechargeable batteries through USB. I then decided to use Lithium Ion Batteries for it. But the problem is that I dont know what parts I need. It should be able to light up 4 COB LEDs (Each rated 12V, photo given) Till now, after looking at several other instructables, I am able to say that: 1. It needs a steup transformer from 5V TO 12 V - TP4056 (https://www.amazon.in/TP4056-lithium-Battery-Charging-Charger/dp/B00JQ2VG1A/ref=sr_1_8?ie=UTF8&qid;=1505148914&sr;=8-8&keywords;=lithiumion+batteries) or https://www.adafruit.com/product/259 2. It needs some sort of protection like: http://www.batteryspace.com/PCB-for-11.1V-Li-Ion-Battery-Pack-4.0A-limit-----PCM-L03S04-559.aspx 3. Also do can I allign three 3.7V Lithium Ion Batteries to make 11.1V? Please help me out Thanks!
Posted by nabeel.quadri 1 year ago | last reply 1 year ago
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.
Asked by SaurIMX 4 years ago | last reply 4 years ago
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.
Posted by Toga_Dan 4 years ago | last reply 4 years ago
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?
Asked by .Unknown. 8 years ago | last reply 7 years ago
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?
Posted by anu_11gem 11 years ago | last reply 11 years ago
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!
Posted by AdvanŽ 1 year ago | last reply 1 year ago
Can the ion drum rocker be modded so ghwt thinks it is the "official" drum kit?
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?
Posted by Unirox 3 years ago | last reply 3 years ago
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?
Asked by dwstar79 7 years ago | last reply 7 years ago
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!
Asked by Ben Charles 10 years ago | last reply 8 years ago
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.
Asked by cdroman 6 years ago | last reply 3 years ago
Someone gave me several Li-ion battery packs (BobS can use anything...). They are all different, but all put out 7.6 V. Apart from the cells (4 of them, 2 x2 parallel), they are stuffed with electronics. They have 2 input wires (sockets), without a voltage rating on them. I already fried one circuit board with 15 V (thought it was 12 V....!!!). A model number Google search did not reveal anything. What would be the voltage to supply the battery packs?? I would like to take the cells out and charge them just like ordinary rechargables. Put them in battery holders for power tools and portable sound system (all have different volatge ratings). Can I use the on board electronics (as is) to charge several ( more) cells in parallel?
Asked by BobS 8 years ago | last reply 8 years ago
I know a faraday cage blocks electric fields and waves and such, but does it also block charged ions.... things such as ozone, perhaps? Probably a stupid question, but its late and I'm tired. Probably not thinking straight. Thanks!
Asked by transistorguy 8 years ago | last reply 8 years ago
I want to build a custom Li-Ion pack using the 18650 cells. But, when I go to look some up online, all that really turns up are the knockoff brands in which they claim a stupidly crazy high mAh rating. So.... where can I get some good cells?
Posted by Dashing Rainbow Dash 2 years ago | last reply 2 years ago
Hello, I'm looking for a rechargeable battery for a project and I'm not having any luck finding a suitable one. Here's what I need: The battery will need to be between 12 - 18v with between 1-2 amp. This will be powering a set of speakers, so not really sure what type of amp hours I need. The battery will need to fit into a tin lunch box. An idea I had was to use a 12 or 18v battery for Power Tools - not sure if it will work though. I also found this, http://www.altex.com/12V-Lithium-Ion-Rechargeable-Battery-Set-LBP-124500-P150057.aspx not sure if it is powerful enough though. Any thoughts/ideas is appreciated.
Posted by RabidNoodle 7 years ago | last reply 7 years ago
Having had to buy a dedicated charger for some 18650 cells (at my wife's insistence) I took an interest in these cells for the first time and their smaller cousins the 123a. At with maximum capacities I've come across so far of 3700mAh and 2000mAh respectivley that's twice the capacity of the battery in my smart phone and 2.5 times the capacity of the one in my basic bar phone. The smart phone width would accommodate 3 of the 18650 cells (6 days without charging at my rate of use) and the bar phone possibly 4 of the 123a's (70 hours talk time or 10 months on standby). Yes this would mean a custom made back, but there is at least one instructable on molding a GRP/ carbon phone back adjusting it to take extra cells and maybe ports just needs modeling clay. I suppose I could just carry a power bank, but why if the phone can be its own power bank? Removing the guts of a power bank and building a new phone back to accommodate them may be the simplest answer to this but, my questions are:- A) I've got old mobiles laying around could I use their charging circuits to charge these standard Li-ion cells? Assuming that is a yes that would mean a long charge every 6 days/ 10 months. I gather there are problems associated with parallel charging/ discharging of Li-ion cells and over discharging so, B) Any advice on doing this other than don't? On the assumption that's a don't or even if its not this strikes me as a safer possibility. C) Could a micro controller be configured to discharge one cell to its limit then switch to the next full cell. D) Could a micro controller be configured to charge one cell to capacity then look for the next under capacity cell and charge that. E) if so could it do both at the same time? If A is possible and the rest not then a multi position switch is probably the answer.
Posted by Stan1y 3 years ago | last reply 3 years ago
Hi! I was wondering what kind of ions are emitted from a spark gap when in use? I have seen alot about negative ions and positive ions, but could someone shed some light on this? Also, how harmful are these ions to the body and what exactly are they made of? THANK YOU ANY sources that help explain this will also be appreciated! Again, THANK YOU
Asked by transistorguy 8 years ago | last reply 8 years ago
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.
Asked by articz82 6 years ago | last reply 6 years ago
I'm working on a project that uses lithium ion batteries as the power source and cannot figure out how to calculate how long it will run for. I have four 2.6Ah batteries connected in parallel, giving me a total of 10.4Ah of capacity. They're lithium ion so the nominal voltage is 4.2v and the minimum I want to bring them to is 3v. My project draws a constant 2.85W of power, regardless of the voltage put into it. What I want to know is, is there any way to calculate or even just approximate how long these batteries will power my project before they run out (the voltage drops below 3v)? The batteries are high quality, so the 2.6Ah rating is pretty reliable. Let me know if there are more specifications needed or something. Thanks ~Dudes
Posted by dudes 3 years ago | last reply 3 years ago
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?
Posted by Toga_Dan 4 years ago | last reply 4 years ago
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?
Posted by rainrose 7 years ago | last reply 7 years ago
I'm trying to figure out how to power a CPAP machine (this one) for a few nights of backpacking/camping. Does anyone know how to hook it up to a lithium ion battery (and what type to get) with out forking over all my money to the medical supply industry? I'm dying to go backpacking for at least a night or two. any help would be appreciated.
Asked by nickbakes 7 years ago | last reply 7 years ago
Hi, my name is Jackson Pugliese, and I am currently building a battery pack that will be consisting of multiple lithium ion batteries. Getting the pack itself together, is not an issue at all, however, what is an issue is battery shut off when charging. I would like to be able to charge my battery pack with some form of laptop charger, that outputs 12v, for a 14.8 volt lithium battery pack. The main issue is overcharging. Lithium ions explode, or catch fire if they are over charged, and thus is not an option for me, so to find a solution, I searched the internet, and two things came up. Option one, use some form of battery charger, that automatically shuts off when It is fully charged (which i do not want to do because I want to do it differently hence the instructable) And Option two, which came up alot, but i do not fully understand is I use something such as this http://www.amazon.com/Yeeco-Current-Polymer-Lithium-Protection/dp/B010NM52LG/ref=sr_1_2?ie=UTF8&qid;=1456701414&sr;=8-2&keywords;=protection+circuit+module+14.8+volt I do not understand what it truly is, nor how to use it, and would like someone to explain to me both of those things. Everything I am doing is safe, because I am using a en closer for lithium ions, in case if they explode or catch fire, so know one has to worry about anything not working. Thank you very much everyone for your time, and have a wonderful day!
Posted by merlinj 3 years ago | last reply 2 years ago
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])
Asked by WanjiangW 6 weeks ago | last reply 6 weeks ago
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 :)
Posted by GhengisKhan1981 10 months ago | last reply 10 months ago
Asked by loki17 8 years ago | last reply 8 years ago
I am looking to build a negative ion generator based spark gap... I need to limit dielectric loss, and need to use 8" of small gauge wire to and from the switch to turn it on. do I need to isolate the switch electronically from the rest of the circuit? if so, would a reed relay do the trick? if I use a reed relay, could I run it from the same power source, in parallel, or do I need to isolate power sources as well? my setup will be slightly similar to the Electrifried shoe diagram below. (no, that's not the project)
Posted by gschoppe 10 years ago | last reply 10 years ago
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.
Posted by ASHMILH 1 year ago
I have an older (dell latitude c400) that works great, its tiny and weights only about 4 pounds. I got it 2nd hand about a year ago, ever since I got it the battery shows no charge even when the laptop is plugged 24/7. Is there a way I can "zap" the battery or something like that?? I've seen instructables about zpping nicad batteries but nothing about lithium ion ones... Any and all help will be appreciated.
Asked by orallo 10 years ago | last reply 9 years ago