Battery recommendation

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.  

Topic by RabidNoodle   |  last reply


Exploding Lithium

Does any body know how to get lithium out of those battery's? it produces hydrogen gas and may ignite on contact with water.

Topic by DELETED_DELETED_kruser495   |  last reply


Reconditioning Lithium Ion Batteries

I'm looking for a DIY method for reconditioning Lithium Ion batteries. Or, if that's not easily doable, someone who knows to tell me so i can just bite the bullet and buy a new one. Thanks in advance!

Topic by royalestel   |  last reply


Rechargeable Lithium Ion Batteries

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!

Topic by nabeel.quadri   |  last reply


Batteries in a series?

So if you were building an electric car and needed to up your voltage by wiring multiple Pb batteries in a series would you only get the watt-hours of one battery like you do with capacitor capacitance, or would you get all of them combined, or at least a little power capacity boost.  Also, would using lithium-ion batteries like these in a series be ok. lithium

Question by jj.inc   |  last reply


replacing AA's with lithium?

 Hey I have a cheap camcorder that runs on AA's but I want to put it on a lithium battery. What I want to use is just the standard battery out of an old phone 3.2v, I'd like to use these because I have a huge surplus of them. I have pretty much no knowledge of electrical circuits and so I need of bit of help. I know two AA's is 3v and any lithium battery is 3.2v, how could I step the battery down to 3v?

Topic by problems   |  last reply


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   |  last reply


Lithium pack building?

I want to make a 4s4p pack out of 18650 cells.  I am asking a lot of questions and doing a lot of research online before buying the parts so I know it will all work when I order the parts.   My first question is, should I make the pack out of 18650 cells with individual protection or all connected to one PCM?  With protected cells all I need to do is connect the charger and the cells will charge and cut off at the right time?  This is the charger I want to get.  Maybe if I used protected cells I should charge them by taking them out of the pack and charging them in 4x wall chargers like this one.   Say I didn't use cells with individual protection.  I have my eye on this PCM . It has a balance control function.  I can see the benefit of balancing cells in a 4s1p configuration but does balancing work properly in a 4s4p configuration when 4 cells are acting as one?   Lastly I want to make the pack user serviceable so I will use battery holders.  I saw some here but it would cost over 50 dollars for all the holders.  That seems too expensive.  Do you know of cheaper ones?   Thank you for your input -Jacob

Question by Noblenutria   |  last reply


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 


Simple Lithium Cell Balancer?

Could your balance a lithium cell by simply hooking it up in parralel for a short period of time every once in a while?

Question by snowluck2345   |  last reply


Solar??? Batteries??? controller???

I want to get these 12v solar battery chargers they come with alligator clamps to hook to the battery. i want to get enough for around 150 volts so how would i hook the solar panels in series, and do i need a controller for each battery? and how would i rig that up and how can I get it going into all the 12 volt batteries without any damage to the batteries etc. And can this be done for less than $400 if the solar panels are $30 each and the batteries are $14 each. THANK YOU!!!!  THANK YOU!!!!  THANK YOU!!!!  THANK YOU!!!!  THANK YOU!!!! oh and could you give me links for all the stuff I'm gonna be buying. THANKS!!!!  

Question by jimmerforpoy   |  last reply


Best non-lithium battery technology

Hi Instructables community! I am looking for any insight / suggestions regarding what battery technology (non-lithium) that offers the best specific energy (MJ/Kg), preferably rechargeable and reliable. My research led me to looking to consider rechargeable alkaline batteries, given data on wikipedia (the BEST source ;)  ) but are these even manufactured? I cannot find any place to buy them. BACKGROUND: I am in need of this for the design for the solar car team at UVa, as the BMS (Battery Managment System) mandates a backup battery that is separate and any lithium technology is not allowed.

Question by -max-   |  last reply


Battery safety

Hi guys, I was wondering if it's dangerous to touch two wires hooked up to a 9v battery to each other. They heat up really quick, could they make the battery explode or do something else bad if left like that for any long period of time? I tried to search for the answer, but couldn't find it.

Topic by Lithium Rain   |  last reply


Cheap Lithium ion batteries - help?

I picked up 4 Canon NB-4L batteries for 50p each, thinking that for the price they might be worth having. However, I don't have a charger - any help with this? I've got power and electronics and stuff. 3.7V 760mAh (Li-ion)

Topic by lemonie 


Questions on building a lithium battery pack with pcb?

I have to build a pack to run my portable N64.  I have some experience building with NiMh and NiCad, but I havent built a li-ion yet. Ive done my research but would like some feedback before I start building. Parts 18650's - 3.7V  3600mAh ea 7.4V PCM for 18650 Li-Ion/ LiPo 7.4V Li-ion/LiPo charger at 1.2 Ah Plan Either to build a 2S2P pack or a 2S4P pack.  Currently the N64, 7" TFT LCD, Controller, and Audio amp w/ 2x 8Ohm speakers is consuming just over 1A from what i can tell.  its running off of a perfboard w/ regulator and rail, thats hooked up to a universal transformer that is set to 7.5V  1A.  Everything works but when I turn the volume up it cuts off and then powers back on.  I dont know any other way to find out the over all power consumption.  I cant just look up all the specs because the LCD is from china and i dont have any specs. Anyway, back to my plan.  obviousely I want as much run time as i can get out of it with out compromising weight and space.  all componants of the portable can run off of 7.4V or lower, to include the lcd even though its rated at 12V. it can run as loas 6.5V. I have been debating between the 2S2P which should yeild 7.4V 7.2 Ah, and give me a runtime, some where in the ball park of 4 hours. or a 2S4P which should yield 7.4V 14.4 Ah. It would only be slightly more space and provide approximately 8 Hours+ Thats if I am even calculating everything right Ok, Regardless of whether i run a 2S2P or 2S4P the connections to the Protection Circuit will be the same, Right? Pos --> B+ Neg --> B- + to - ( Between Series connection) --> B1 or BM I understand that Li-Ion are safer when it comes to balancing then LiPo, but is this right?  having 2 parallel cells or 4 parallel cells connected with the only balance connection between the series.  I just want it to be safe. Next  is the charging.  I bought a cheap smart charger for 7.4V 1.2A output.  Will it matter whether i build the 2S2P or 2S4P, or will it work for both.  I know it will obviousely take twice as much time to charge with the bigger pack, but is their a max number of individual cells that a PCB can handle, or does it only matter the overall voltage? I also Included in my diagrahm a setup for a DPDT switch to change between pack powered, wall powered and battery charging.  I want it to have an "ON" and "OFF" setting. while off, pack is disconnected and if wall charger is plugged in, it will charge the pack.  while in the "ON" position, pack will power the device, but if wall charger is plugged in, then it will run off that. Can I even use a wall charger for the Li-Ion pack to power the device, or will it not work.??

Question by supramp 


Strange battery charging idea.

So I have an Idea for a charger for a portable computer.  It will be solar powered, and charge li-ion batteries.  My question is how could I simultaneously charge batteries and power the computer at the same time.  No schematics are needed, just a quick written answer. Thanks!

Topic by Skiboy941   |  last reply


DIY battery setup help

Hi, I'm a first time DIY-er and would like to build a useful, long lasting battery pack for my *new* laptop (late summer). I'm 17, and this would be a perfect project for me to finish in the next few months. I'll be working with my dad and asking my physics teacher, who seems very all-knowing, for advice. My teacher understands electricity and batteries better than anyone else locally and is leading our STEM team, of which I am a member and need this experience. Keep in mind that I'm not just doing this to have a (much needed) battery pack for my laptop. I got most of my information from here and will most likely be purchasing new batteries. As far as the housing of the components, I have a hard plastic, 10+ year old lightly used blue lego container in the shape of a kid-sized briefcase.  Case: Old blue lego carrying case, 11” x 7.5”(9 including curved  front) x 3.5” Insulation tape Batteries: (x4) Battery holders: (x4) PCB: (protected voltage is higher, balance charger required) Balance Charger: Fuel Gauge: DC port: Wire terminals (for organization) Balance charge cords: Optional inverter: I heard about these being inefficient, so I'm not sure about it. Please inform me if there are any other parts that I'll need or if I've left out any information. Also Inform me if everything I'll need for a lithium battery pack is on this list. P.S. The case was chosen based on the fact that it will fit in my backpack with my books and looks much less alarming and more like a DIY battery than a black box or briefcase. especially with the fuel gauge and plugged in laptop.

Topic by leaf26   |  last reply


Battery Pack

I want to start a battery pack but I don't know how to connect series/parallel to get most mAh but also 5V-12V output I plan to buy 8 3.7V 2600mAh Lithium Ion Battery but I don't know how to connect those together to get the most mAh as possible but also between 5V to 12V output . It is possible to do that with 

Topic by Kyosoul   |  last reply


Does cold harm lithium batteries? Answered

I know that Nicad batteries can be damaged from being left in the car in sub freezing temperatures.  Is this also true of lithium batteries?  I'm in a northern climate where we experience below zero temperatures so I need to know if I have to keep bringing my lithium battery packs inside every time I park the car.

Question by etcmn   |  last reply


How long will a lithium battery store? Answered

If I bought 2 rechargeable lithium polymer batteries for a cell phone, but only needed one for now, could I store the unused battery until the first battery quit charging (and was garbage)? If the above question makes ZERO SENSE, let me try explaining it another way: Ok, you have this fancy gadget that you want to keep functioning for many years. Eventually, the battery inside won't be able to take a charge, and the battery will be obsolete and no longer sold. Would it make sense to buy extra batteries ('stock up') and store them for a time when the original battery went bunk; would the stored batteries be like brand new after many years (these batteries would have never been charged before.. they would be still originally packaged)? Hope that actually makes sense :D -Neph

Question by nepheron   |  last reply



Piggy Backing a lithium battery (cell)

I have several questions.  But the basic idea is that I want to extend the runtime of a device (such as a cell phone, tablet, camcorder, whatever) by increasing the mah.  So here are the things I am wondering: 1)Many lipo batteries have 3 or 4 contacts, one is -, one is +, and the others are typically data or something.  can I simply connect additional lipo's (just the + and the -) in parallel with the corresponding contacts in the device? 2) Are there any ill effects of charging (presumably from the built in charger of the device, like a cell phone) and discharging (using the device) parallel lipo's? 3)  They will all have the same voltage rating, but do they all have to have the same mah rating? thankyou

Topic by guyfrom7up   |  last reply


Lithium Ion battery for CPAP machine?

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.

Question by nickbakes   |  last reply


Lithium ion battery capacity calculations?

     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

Topic by dudes   |  last reply


Lithium Ion Battery Shut Off

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!

Topic by merlinj   |  last reply



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.   |  last reply


Fixing a Dead Li-Polymer Tablet Battery by Over Voltage

Hello all,I find this Instructable https://www.instructables.com/id/How-to-Fix-Dead-L...I need to use this method for a Pegatron battery G6BTA019H P/N:0B23-00E00RVhttps://i.ebayimg.com/00/s/MTIwMFgxNjAw/z/EkIAAOSw...but I can't find a diagram of the pinouts for it, would it just be a case of connecting the very end wires, labelled + and -?How risky is that if it's wrong?Is there a way to test them with a multimeter?Thanks

Topic by PlexusIndustrious   |  last reply


How to make a battery charger?

So I was just wondering, what basic guid lines do you have to follow when making a battery charger for say a lithium-ion battery? How many volts do I need to supply to it? Do I need any protection diodes? How would I keep it from charging to fast, or trying to charge the charger? Thanks!

Question by HavocRC   |  last reply


AA Battery replacement

Hi, So I have a AA battery pack inverter for some EL wire, and I was wondering if it was possible to replace the AA battery's with a lithium Ion battery to reduce its size. What kind of voltage should I look for/do I need to take into account amperage?

Topic by Fozzibehr   |  last reply


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   |  last reply


Why is it so hard to find lithium ion rechargeable AA, AAA, or other standard battery sizes in lithium ion? Answered

No real details here just though it would be nice to get standard battery sizes in lithium ion rechargeable instead of nimh.

Question by robbtoberfest   |  last reply


Will this battery explode??

Silly question, but I really wanna be on the safe side.  I just received this battery charger for my phone, but wanted to change the case, so i removed the original case.  Then I looked at the battery, and saw that the (-) of the battery is not soldered to the PCB at all, only the (+).  I know that lithium batteries are dangerous, so I just wanted to ask if it's safe to use. It was like that, I didn't accidentally rip it of. There are even no marks on the (-) connector sticking out from the battery. Can someone please let me know if it's safe to use?  I added some images pointing out the place and the board.  Thanks a lot for your help. George 

Question by grancharov   |  last reply


lithium 18650 series first or parallel?

Hey all Looking at doing a lithium battery build but trying to cut down on soldering or spot welding. My idea is to use a stack of 3 18650 batteries in series pushed inside a piece of PVC pipe, thus making a 12V tube and then having multiples joined together to make the final battery Is there any reason why people mostly use a set of batteries is paralel then series?

Question by pickstock   |  last reply


Will it be safe to charge a 3.7v 2000 mAh lithium battery with a 5v usb cord

I am making an Altoids USB charger with a 3.7v  2000 mAh battery. The project will have a 2.5 female connector. Would it be safe to charge it with a 5v usb to 2.5 cable?

Question by Sargebubbles26   |  last reply


Lithium ion battery help: please read Answered

I have question about lithium ion batteries. I do a lot of electronic work (both school and hobby) and I have never really learned about these batteries, I do know the basics but what i want to know is, if I replace a lithium ion battery with another, same voltage and maybe higher mah, but higher capacity would there be any risk? I want to add a higher capacity lithium ion battery to one of my projects but fear any bad outcome. any info would help a lot! I would still be charging the battery with the same voltage and discharging. so the only thing changing would be the battery size. does this pose a risk? I think the answer would be no risk but i feel as if its better safe than sorry.

Question by out-of-the-box   |  last reply


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   |  last reply


Lithium polymer protector (LVCO)?

Has anyone used a very small low voltage cut off (LVCO) circuit on a lithium polymer battery? I found a nice collection of lithium polymer cells in a 'dead' laptop battery. Thing is, I don't want to be careful about over draining them and they don't seem to have a low voltage cut off circuit in the individual cells. Sparkfun sells batteries with a teeny LVCO system built into the cell package like this:  http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/BatteryProtection.pdf What would be a reliable source of similar reliable boards that protect from over discharge?

Question by snotty   |  last reply


having a little trouble picking out 18650 batteries for my 3A flashlight? [answered]

I am looking for a few batteries for my flashlight. i have one the LC 18650 but it will only lash a few days of use. OK, i do want a high quality 3A battery (for 1000 LM from my light) so one that that supports the current. i prefer one with a safety circuit in it, one that holds at least 2200 MAh, ok, i shop for that, but what is the difference between: LIR  18650, LC   18650 (the one i have) (i think LC stands for "low current drain"), GTL 18650, TR   18650, AW   18650, (i know this offers 5A, but its expensive and rare.) BRC 18650, XSL  18650, TRC 18650, i know the AW battery offers 5A max.

Question by -max-   |  last reply



iPod Touch Battery Thickness (need thin battery)

Does anyone know the thickness of the 4th gen ipod touch battery?  I'm looking for a thin lithium battery (less than 2mm thick) that has decent capacity (more than 300mAH).  If anyone knows the thickness of the ipod battery (or any other suitable battery) it would be greatly appreciated.

Topic by guyfrom7up 


Mimicking a 3.7v lithium battery with solar power

I'm trying to replace a digital cameras' battery with a solar power source instead. The camera would only work in the sun with this power source, but that's exactly what i want. The battery I'm trying to mimic is 3.7v at 760 mA. I was thinking of making a solar panel with an output of 5v at 1amp, and then using a voltage reg to bring the 5v down to a steady 3.7v. Can I get a 3.7v regulator? Is there such a thing as an adjustable/customizable voltage regulator? Would 4v be fine instead of 3.7v? is it close enough?

Question by solarbug   |  last reply


charging lithium ion battery with solar instead of lead acid battery?

Iam using a 6v, 4.5ah lead acid battery to power my 6 leds each of 0.20 watts for around 10 hours . also i am recharging the battery with a 5 watt solar panel . now i want to switch to 3.7v, 5.2ah lithium ion battery. will it work ?

Question by rockyYyY   |  last reply



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   |  last reply


Lithium Battery Specialist Needed for custom project

I’m looking to build a custom battery back from LFE / LiFePO4 batteries or possibly Li Ion. I need someone familiar with power management and charge management circuitry in relation to these batteries.    I’m looking to have someone to build a prototype for me, and consult me on modifications.  Preferably I’d like to find someone around the Chicago – Milwaukee area who I can work face-to-face with, although phone-based work would also work. I am of course willing to pay for services rendered.

Topic by akira2501   |  last reply


Charge 4 Lithium Ion Batteries in series?

I have got 4 3.7v 6000mAh lithium ion batteries connected in series with 2 batteries holders. I would like to charge them without taking them out (prefer to seal a unit). Anyone know how to do this (I could connect the 4 "cells" individually to separate input/outputs.)? Also have 19v 3.16A power supply available to use also for charging (Batteries are for making it portable and plug for the 19v) Have this ordered if it is useful: 4-Cell Li-ion Li-Po Lithium Battery 18650 Charger Protection Board Help appreciated

Question by bonze77   |  last reply


How do I reduce a Lithium Polymer battery voltage?

I have a 7.4V lithium polymer battery (http://www.all-battery.com/74volt-6000mahli-polypackwithpcb31185.aspx) and an 8.4V smart charger (http://www.all-battery.com/universalsmartchargerforli-ionpolymerbatterypack37v-148v1-4cells.aspx). The issue is that I need to power a device that needs 6V. If I put a voltage regulator in line with the battery leads I'm sure it'll work, but then how do I charge the battery with that charger, as the regulator will also reduce the 8.4V the battery needs for charging? Maybe by introducing some kind of "bare metal tap" upstream of the regulator, so when I plug in the charger it bypasses the regulator and wires straight to the battery? (see the attached illustration) Would this work? Or should I do something else?

Question by Dgcaste   |  last reply



Why the cordless drill motor not run?

Hi all, I have a problem with the motor of the cordless drill. I converted my cordless drill from Ni-Cd battery to Li-ion battery 12v6 using the protected PCB as this image: http://www.ultest.com/shop/image/cache/catalog/Power-Modules/HX-3S-A01-1-500x500.jpg. After connecting the 3 cells Li-ion battery to PCB, I measured the voltage at P+ and P- is 12v. So the connection between the battery and PCB is correct! Try to connect P+ and P- (from PCB) to the positive and negative terminals of the motor, then the PCB cut-off voltage at the output pin. The reason is the 2 terminals of the motor is connected (using the Digital Multimeter to check). How to resolve this problem with the motor working properly? Thanks. Sy Do

Question by sydo   |  last reply