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Topic by Yerboogieman    |  last reply


I want to know if it is possible to convert something you plug into a wall and hook it up to a 9v battery. 

Topic by elizila    |  last reply

Portable,rechargeable mobile charger? Answered

I've come up with a plan to make a potable mobile charger for my galaxy phone with a rechargeable 9 volts battery.My original mobile charger(220 VAC input) says it gives an output of 5VDC at 0.7 amperes and hence I decided to make it with the given ratings.So here's my plan-I'll use a 7805 to regulate the 9VDC from the battery to 5VDC.The 7805 gives a maximum of 1 A output.So here's my question should I use a current regulator(LM317) to limit the current from exceeding 0.7 amps or will the phone's battery draw the sufficient amps from the LM7805?Maybe it might be a good idea to assist the output with a resistor as a safety measure.So,what do you say?

Question by Adarsh_tronix    |  last reply

Capacitor charger? Answered

Ok so im planning on building a portable coil/rail gun. But one issue is I cant quite find a circuit that would work best to drive a custom transformer. The charger I have now is a flyback driver that I used a wall adapter to power. I just need some advice and maybe schematics. Thanks, bud

Question by budhaztm    |  last reply

Increase battery of a portable usb charger?

I have a  portable usb charger that has these specs: Li-ion 3.6V    1200 mAh Input: DC 5V    400 mAh Output: DC 5V    450 mAh Can i add an old battery that has 3.7V and 1150mAh to the charger and increase the battery life of it? Would it be safe to just hook up the the negs to negs and pos to pos? Also what would be a better way to increase battery of the charger without buying a new unit?

Question by yitmat    |  last reply

Why is my portable charger doing this. Answered

Okay so everything is solderded correctly with the right amount of voltage on the data lines. When i check the voltage it says 6.54 but when i plug my usb up to my phone it drops to 2.89 why is this? I used this

Question by tramont    |  last reply

building a portable lead-acid charger?

I have two lead acid batteries rated 6v 4.5 AH (is AH ampere? or ampere/hour) boast/equalize 7.2-7.5v float 6.75-6.9v max charge current 1.35A both my batteries are identical the question now is.. i want to build a charger for it and something to lower is current so some feature i want is  1) rechargeable by a simple plug in adapter (i have a 12v 4A ac-dc adapter) 2) output of usb voltage and current (optional adjustable current and voltage) 3)led indicates 4)optional: a switch to power usb devices directly from the adapter/bypass battery to extend battery life 5)around 5 usb out puts? i want to build this project cos i have the won batteries which are in good conditions but not being used in anyway.. i hope someone can help me with the technical specs..especially on the circuit diagram   have access to an electrical components shop but it does not sell chips so i need to salvage them

Question by michaelgohjs    |  last reply

Solar Charger?

Hello, I am looking to build a solar charger in a 4x3x1.6 inch (or smaller) box to be as portable as possible. My only problem is, I would like to mount the solar cell on the box. However, all solar cells are far too large to fit this box, I plan to use a rechargeable 9v battery for power storage. I was wondering if I can use a 6v solar cell, and still use a standard LM7805 5v Voltage Regulator to drop 6v to 5v, or if someone could find a 2.5x3.5 inch solar cell (9v) online somewhere (for cheap) that would really help (I've looked everywhere...) Thanks.

Question by Tuckoguy    |  last reply

Charger circuit

Hey there, I'm planning to build a portable stereo speaker box thingy (you know what I mean). In order to power the 2x10W amplifier I want to use a 7.2V 1400mAh battery pack from an old RC car. As the housing of the box will be sealed I want to implement a mechanism to charge the pack. For this I wanted to achieve 3 things: -If the Power-Switch is turned on, the amp should be powered from the power line -If the Charge-Switch is turned on, the battery pack should be charged -If both of the switches are turned on, the amp should receive power from the power line while the battery pack is being charged. I have thought of the following cabling (see attached picture for a schematic) The blue box is the amplifier, the green box the battery pack and the orange connectors are tamiya connectors (the ones for RC cars) The first switch (marked in green) is a normal DPST switch which establishes the connection with the power line as well as the connection with the battery The second switch is a SPDT switch and activates either the connection between the battery and the amp or the connection between the power line and the battery. Will this work the way I think it will or does this configuration any faults? If the latter, what can I do I have to change? I'm actually really new to electronics, this if my first project so forgive me, if this setup is actually BS Cheers and sorry for the long post ^^'

Topic by Felixkeeg    |  last reply

Super usb Charger?

Im planning on building myself a portable rechargeable large capacity (Ah not mAh) usb charger. Im a bit of a electrical newb but I am a mechanical engineer in training, If someone could point me in the right direction or at a good instructable that would be awesome

Question by Douglerful    |  last reply

How to get my portable charger working?

Im building a portable USB charger but for some reason my phone ins't showing any sign of the charger being connected. It used to show when it was connected but I cant figure why it isn't now. I measured the voltage going to the USB its 5v and the two data lines are 3v. I used 33k and 22k for the data lines so i can get 2v to each line. Is there anyway someone could kinda assist me on making this circuit on a breadboard i'm kinda getting confused on how to set it up. Also is my 7805 going bad because sometimes the input voltage is the output voltage.

Question by lsavage-1    |  last reply

Help with iPod Classic USB Portable Charger? Answered

I've seen so many portable iPod chargers out there but I'm not that experienced to handle the electronics. So, what I wanted to do was to take apart old adapters and connect it with a 9V battery (with the battery slot from an old alarm clock) A couple of questions I have are.. -Does the adapter have a regulator to bring the 9V battery down to the proper amount of volts needed to charge the iPod? -How much power is needed to charge the iPod? -On the battery wire thing, which wire is negative, which is positive? -Which wire (on the battery slot) is supposed to connect to which wire on the circuit? -On the circuit board, which is negative, which is positive? Specs: -(Relying on the informational sticker on the adapter) Circuit board input: AC100 - 240V 50/60Hz -(Relying on the informational sticker on the adapter) Circuit board output: DC5V = 200mA -More specs in pictures Hopefully, the circuit board already has a regulator, to bring the 9V down to a 5V, so I wanted to post this to ask the experts on 'ibles to see if it probably has a regulator or by using the pictures.. thanks so much! If you need more pictures of anything, just ask; thanks again for helping :D

Question by InstantAsianNoodles    |  last reply

who can design a portable wind laptop charger?

Who can design a portable wind laptop charger? 

Topic by greenlife    |  last reply

How to easily make a portable ipod touch charger?

Something that is really portable and easy to make. Thanks

Question by Pimpdog23    |  last reply

altoids tin charger problem

If anyone in the instructables community knows circuitry well please look at this circuit diagram for a 9v portable charger.  

Topic by seedeeess  

portable ipod touch 4th gen. charger safe and wont blow the battery

Will some one please help i need a schematic for a ipod touch 4th gen charger and be portable and safe for my brand new ipod please help!! !!

Topic by agm88  

RC Car Battery Powered Portable USB Charger!

I recently decided that I wanted to build a "USB Battery Pack" for charging my USB devices, like my phone and camera, on the go, however, I'm pretty new to this stuff. Like, circuits and DIY electronics. So...I need help. Like, very detailed help. I have two batteries from some old RC cars. They're Nikko brand, 9.6 volts each, and they look like this: I also have the connector for them, with the red and black leads coming out. What I'm wanting is charger to have is 2 USB ports, an On/Off rocker switch, an LED for On, and an LED for Low Battery. But I have no idea where to start, what to buy, or how to connect what to buy. So I'm asking here. There have been plenty of tutorials for usb chargers on here and Youtube, but none close to what I want to make. If the batteries I have wouldn't be as efficient, please tell. If anyone could help, I'd appreciate it!

Topic by ccain3  

battery isolation for portable power. Answered

Iv been trying to wrap my head around what im trying to do and cant quite figure it out. Pretty much i have salvaged 8 18650 size cells that i would like to run in parallel to make a portable battery. In order to boost capacity, i would like to buy new cells and make another pack that is parallel also. I want them parallel so its a nominal 3.7v system that i can boost to 5v for USB devices I know its bad to run old and new batteries in parallel do to various reasons such as self discharge. My idea is have 2 usb ports for one pack and 2 ports for the other pack and have an input/output protection PCB per pack. Now to keep this more portable i only want to use 1 charger and this is what confuses me. I can charge each pack separately, but that would require me to swap packs on the charger, and i would rather not have to worry about doing that. Long story short, how can i charge 2 battery packs at the same time but keep them isolated from each other? Diodes maybe? Also with how the protection circuits work having the charge leads connected to the output leads and the batteries on there own leads, when the charger is outputting over one amps, will it hurt any device plugged into it or will it regulate the current down to one amp with no harm done? Link to usb charger and protection circuit.;=STRK%3AMEBIDX%3AIT;=STRK%3AMEBIDX%3AIT

Question by Ksp3cialK    |  last reply

hi i have looked at most portable ipod chargers but i could not find any that worked for the itouch 2nd gen please help?

OK hi i have looked at most portable ipod chargers but i could not find an that worked for the itouch 2nd generation please help...?

Question by ppatches24  

I have a chinese USB charger i got from my Chinese MP4 can i make it portable?

I want to use it with Batteries instead of plugging it to a wall.

Question by wantei    |  last reply

can i use 4 rechargeable aa batteries for a usb charger? Answered

I found a lot of portable usb charger Instructables using a 9v and a 5v regulator and one that used 2 aa with a 5v boost converter. if I'm using it to charge a device that uses a 3.7v li-ion, then wouldn't any voltage above that work, so as long as it's not high enough to damage whatever it's charging? so would putting 4 aa (4.8v) with just a capacitor and diode work as a safe portable usb charger? or does it need to be exactly 5v?

Question by the judge    |  last reply

12v to 12v lead acid charger? Answered

Is there any way to make or buy a 12v battery charge another 12v battery?

Question by Daniel Deacon    |  last reply

how to make a dsi porable charger??

Hi there i want to make portable charger to charge my dsi i first thing of using 4aa rechargable batterys but those batterys put out 5.3volts and my dsi only need 4.6volt so if anyone knows please help me!!!

Question by Andrew_48    |  last reply

How to convert solar car trickle charger to usb/battery charger?

I would like to know how I could convert one of these solar car battery trickle chargers to a charger that could charge ideally AA and/or AAA batteries but have a female usb port to charge usb powered devices. The point of storing the power in portable batteries would be that it would then double up to charge those batteries if I ever needed to charge them. I do want to spend as little as possible and buy as few parts to do this as possible. I understand that larger batteries would be able to store more power but it would then mean it would not charge AA or AAA batteries and make the whole thing a lot bulkier and expensive. I have a choice of solar trickle chargers being 12V/12W, 12V/4W, 12V/2.4W and 12V/1.5W. They come with crocodile clips and a cigarette lighter plugin. I also have an unrelated usb charger (with female usb port) that can plug into a cars cigarette lighter so Im not sure if it would be possible to attach the usb section to the solar panels cigarette lighter plugin. I also have a usb charger that plugs into the mains. I know almost nothing about circuits. The general point is to be able to make the charger as multi-purpose as possible, like being able to charge batteries or usb powered devices but without making it awkward to use or un-portable. I have looked at the related instructables but im unsure how you could change the voltage to make it safe for the batteries/usb port etc. thanks

Question by lsadwdwadw    |  last reply

Any recommendations for portable 12v batteries?

Could you recommend a 12v battery that is: - light weight - 6Ah or more - quick charging - long lasting - preferably comes with a mains charger. Will be used to power a portable audio system. BTW: Anyone have experience with such suspicious looking solutions as ?

Question by suhajdab    |  last reply

laptop charger, please help fast! Answered

Im going on a plane trip on the 11th and there isn't a place to charge my laptop on the plane and im sure my battery will die. i need a portable way to charge my laptop on the plane, i was thinking of like something with a 9v batter with a dc to ac inverter to step it up to 120VAC but iv'e never used an inverter for a project so i need a schematic or something, please help me!  

Question by Jimmy Proton    |  last reply

I have some questions about building a solar charger for my electronic devices. Please help!

I want to make a universal solar charger for my electronics (like phones, ipods, gaming devices). I have a tiny tiny bit of basic knowledge about circuits (did not pay attention in physics...), so I really need your help. I have a few questions here.Most solar chargers I see from the Instructables connects to a battery first. Is is possible to connect it directly to the electronic?Is it possible to make a solar charger that can allow a device to charge like it charges to the wall. I mean adding a socket to the solar charger. So instead of the charger plugging into the device, the device is connected with its usual charger wire (with a plug) and then plugs into the solar charger socket. Just like how you would normally plug it to the wall. Please tell me if there is something like this.Is the solar power strong enough to charge the devices? If not, is there an easier way to step up the power? If you can, please provide a diagram/picture/link.Thank you so much for your help =)

Question by viviluk    |  last reply

Portable power source for low power usb device when away from computer?

Hope someone can help.  I've looked at all of the usb charger instructables, but most of them are for Ipods and such.  This device, I think needs to be low power like required by keyboard or mouse?  The manufacturer says this about powering the device: "works only on voltages of 2000mA or higher, such as a PC. It will not work while connected to a USB or home charger, or with a Mac" I would like to use this when away from my computer and think one of the Altoid power chargers would work.  Would like to make a solar one for the car, but regular for inside the house. Thanks!!

Question by lidowho    |  last reply

hi, well i just bought a portable battery usb, but output was 5,5v (testd 5,47v), can i use for smartphone and psp 5v?

Or i need build a simple circuit using a regulator like 7805? or another way?, thx and sorry about my eng ^^

Question by useless84    |  last reply

Portable battery bank to charge a laptop?

Let me start off by saying that this problem may well have no possible solution and I'm probably a fool for asking. I was wondering if there's any simple(ish) way to use an external battery bank with 2 USB ports on it to charge a laptop? The bank has 18,000mAh of capacity, one 2.1A, 5V USB port and one 1A, 5V USB port (total 15.5W). The laptop charger in question runs at 19.5V, 2A DC (total of 39W) and the laptop battery has a 3800mAh rating. Thanks in advance for any replies :)

Question by CustardInc    |  last reply

How to make an RC-Car-Battery Powered Portable USB Charger?

I recently decided that I wanted to build a "USB Battery Pack" for charging my USB devices, like my phone and camera, on the go, however, I'm pretty new to this stuff. Like, circuits and DIY electronics. So...I need help. Like, very detailed help. I have two batteries from some old RC cars. They're Nikko brand, 9.6 volts each, and they look like this: I also have the connector for them, with the red and black leads coming out. What I'm wanting is charger to have is 2 USB ports, an On/Off rocker switch, an LED for On, and an LED for Low Battery. But I have no idea where to start, what to buy, or how to connect what to buy. So I'm asking here. There have been plenty of tutorials for usb chargers on here and Youtube, but none close to what I want to make. If the batteries I have wouldn't be as efficient, please tell. If anyone could help, I'd appreciate it! 

Question by ccain3    |  last reply

Is There Anyway I can use my chinese mp4 USB charger with batteries instead of plugging it int the wall?

It's an Ipod i bought from a nearby store. Its Kinda nice but i want to use the charger for easy use while traveling. I want to use it with AA batteries or 9V batteries can anyone help. If more info is needed please inform me.

Question by wantei  

18V motor running of a 19V laptop charger

I do not understand how people can do this.  I have wired an 18V portable motor directly to a 19V 3.16A laptop power adapter and the motor kicks and kicks constantly but does not spin. The power adapter has more than 19V tested with a multimeter. I did see reports that power adapters for laptops have a controller built into them to do some kind of regulating and thought this might be a problem and this motor has spun ok at times.  What could the problem be?

Question by nbaker3    |  last reply

Need a portable solar system to recharge my electric car that has 6 batteries?

I would like to create some sort of portable solar recharging device for my NEV. I was thinking I could mount the solar panel on the roof (or is that just crazy) and then wire it to the recharger that could be carried in the trunk. When I stop somewhere, I can just plug the solar charger into my car and have it recharge as I'm out to eat, at the beach, or wherever I've gone.

Question    |  last reply

How to battery power a PC just like a laptop?

I'm wanting to battery power a PC but don't know exactly how to assemble it, here are the parts that i plan to get.My PC is going to draw roughly 150w, i would like it be charging and usable at the same time just like laptopbattery: what charger should i get?Don't know

Topic by OTKZuki    |  last reply

9V-12V from portable battery to usb hub?

I have a portable battery: I would like to run the output labeled DC9-12V (or DC16-20V) to a 5v/2.1a usb hub that I have.  I was thinking I could strip down a 12v usbhub car charger, but I wouldn't know how to manage the connector.  Has anyone done anything like this? Thanks

Question by 9zpvwz    |  last reply

How to Charge Rechargeable Batteries Via a Micro USB Port in a Portable USB Charger

I recently made one of the Altoids box USB chargers that have been popping up all over the site and it turned out great, but now I'm looking for a little more of a challenge, so for my next endeavor I'd like to make a portable USB charger which uses rechargeable batteries that can be recharged while still in USB charger through a micro USB input (like how you plug in a phone to charge the internal battery).  I've seen a few projects that use solar panels to achieve a similar result but (perhaps just due to my own limited knowledge) I couldn't figure out how to make it work with a micro USB port. Also, if possible, I'd love to be able to use the 18650 (EFest IMR) as the rechargeable battery/batteries.  I have a few of them that I use for e-cigarette mods and they hold a good amount of juice so why spend more money on rechargeable batteries when I already have some.  But if using more conventional batteries would make things easier then that's not a problem at all. I can't wait to hear the community's input on this.  And to those who are the knowledgeable ones in this field, don't feel obligated to say everything entirely in layman terms for my benefit  - what I don't know I will look up; how else are we supposed to learn new things anyway?  Thank you for your time and for any help you can offer! -John

Topic by nettles4349    |  last reply

Can I charge an Electric Scooter with a portable battery?

Okay so the first question is, could I charge an Electric Scooter while it's in use. The Scooter in question is a Bullet XCT 85, which from what I can tell is a Xiaomi M365/Pro Knock off.While I have it plugged in and charging to the wall, I can still turn it on and use the throttle, whether it's still charging (as the wall charger would indicate) or the scooter has safe guards to stop the charging from happening while it's powered on, I got no clue.Second part of the question is, the scooter supposedly (I haven't and don't want open it up to check) has a 36V 7.8Ah Battery. So with that info would I thearetically be able to put together a battery of also 36V and different Amps to either 1. Charge the scooter on the go or 2. Have a battery back up, for when I haven't got access to a wall charging option.As for the extra battery, the current idea for cost vs. capacity is get 3x 12V 9.8Ah Li-ion Batteries in series to make a single 36V battery, with the right plug on the end to plug into the scooter. And possibly some sort of battery meter to be able to read the battery level.Side Note - I don't have any electrical knowledege, besides the basics. But I'm a quick learner.

Question by NicolasR46  

How to make a USB charger from a tablet battery? Answered

I have a tablet battery, L10C1P22 and it's in good condition. I was scouting through Instructables to see if anyone has made a USB charger based on a tablet battery. And I couldn't find one. So may be I haven't found it despite it being there. Can anyone direct me to a source that instructs or at least provides a brief idea of how I can make this happen. Or if someone knows how to, please please share it with me. I'd be very grateful. Thanks Amol

Question by amoljoshi_bangalore    |  last reply

Help needed desperately ! (Question related to batteries) Answered

Hi Guys,              Recently I planned on making an portable phone charger the classical way, with a car phone charger. But then I came across the problem of choosing a battery. The 8 AA batteries way is not economical, as I will be charging a Sony Xperia Z1 and it will drain the batteries in one charge. The 8 AA rechargable battery method will be better but will set me back about $20 so that's a no. If I use a 9 volt battery it will charge the phone 20%. The final and the most stupidest method is to connect 10 9v batteries so that I get 9v 4 amps but that will be too bulky. Lithium batteries are useless as I will get the required amperage but the voltage will be too low and the other ones will once again set me back too much. So the only way is to use 8 AA batteries but every phone charge will cost me approx. $1. Is there any other cheap way or 8 AA batteries it is? Thanks in advance :).

Question by The Prickly Potato    |  last reply

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

in where do I find and how do I tell if it is a 5v regulator?

I need to find a five v regulator(7805) for a portable 9v battery charger and i cant go out and buy one. can someone tell me in what device i can find a resistor(specifically 5v).  And i need to know how to tell if it is a 5V Regulator. heres one i found.. does it look like a 5v?                                                                                                                                                                                                                                                                       thanks,                                                                                                                              The DoctorOfAwesome

Topic by Dread_Neck    |  last reply

usb charger that gets power from a 12v battery of a car or truck? Answered

I would like to know the components i would need to make a portable usb the battery would be off of a 12v car or truck battery that will be constantly charging  by the alternator(i drive a forklift all night).i would like to be able to charge my phone and my hmdx speaker or any other usb device.i would like to fit it all in an altoids can if possible.Any and all help is greatly appreciated.

Question by ERIK G    |  last reply

Making A Dual USB 3V TO 5V Converter, HELP?

So I was browsing the web and came across this "3V to 5V 1A DC-DC Converter Step Up Boost Module 1PC" and was curious to know if i could attach a "Dual Usb Type A Female PCB Connector Component" to it?  Is this possible,  because I know that the single "Step Up DC DC Converter Boost Module 3V To 5V 1A USB Charger" has one output connector. Therefore if i buy the module without the "USB PCB connector"  will it be able to support a "Dual Usb PCB connector" once I soldered it on?? 3V TO 5V STEP UP MODULE LINK: DUAL USB FEMALE PCB CONNECTOR LINK: Please let me know if this will be applicable in response! thanks for your time ,RookieSean

Question by RookieSean    |  last reply

Project Help - USB Charger AA batteries

So i wanted to try and pick peoples brains about this and surprisingly my web searches havent really returned anything fruitful on the subject. I have an electronic device that uses 4 AA batteries in series (6v) in a standard arrangement. Due the relative newness of the product and the way the battery compartment is shaped, its basically impossible to replace them with a 6 volt pack and its equally tiresome to use rechargeables as the battery compartment is screwed shut and this is designed to be a portable device. Ideally what I would like to do is remove a section of the case and embed a micro usb socket and setup a charging circuit to the existing battery compartment and stick some long life (lion maybe) AAs in there then just leave the compartment shut and charge via the usb port. Maybe add an led indicator for charge level, i dunno.  However, while i can solder with the best of them, the actual engineering part of laying out the necessary circuit etc is wayyyyy beyond my skills. would anyone be able to assist? Would it be easier to just scrap the battery compartment entirely and stick a battery pack inside the case that was 6v and many many many mah and hook the charge circuit up to that and its leads to the wires going to the compartment and leave it empty? theres plenty of hollow space inside the appliance itself. Second, the device itself doesnt have a "hard off" switch, it has a momentary to boot it up and a reset button. The momentary is constantly being hit in travel and turning the device on, draining the batteries. Theres no internal memory to worry about being wiped, so id love to slap a slider switch on there to kill power to the whole device unless its physically toggled, especially if im cutting a spot for a usb port as well.  Anyone willing to help consult to bring this to fruition? Ill happily give you full credit and buy all parts and what have you, and do all the solder work, just need someone to help me plot out the circuits, decide best course of action, and design a nominal breadboard to slap it together for testing.  

Topic by xBenedictx    |  last reply


How come capactors are used so much in electronics for exampel: what are those 2 capacitor doing?

Question by Balls of Kevlar    |  last reply

Trying to construct a battery powered usb hub. Will this work??

Let me start of by saying that I suck at electronics and to tell me to build something from scratch would completely miss the point of why I am asking this :P What I want to do is use readymade components to combine into a portable usb hub. I want it to be highly customizable and powerful enough to power several usb devices at once. Such as powering several usb speakers, recharging a phone and so on for extended periods of time. And it has to be as energy efficient as possible without costing a gazillion bucks. If I was not at all worried about wasting power I would have solved it already :P Here are the parts I have picked out. 1. 12V Rechargeable Li-on Battery 9800mAH;=item41577f8596#ht_4008wt_804 2. Hobbywing UBEC-8A;=item3a65376410#ht_2324wt_785  3. Powered 7-Port Usb hub;=item4156468fe5#ht_4224wt_804 I hope someone can help me out with confirming that my setup would work. Or tell my exactly why it would not. I would greatly appreciate it :) /Nicklas

Question by AlmostNormal    |  last reply