charging one battery with another battery

I want to make a project about battery charger.i want to know if a battery can be charged using another battery of same specification. please help me

Posted by sampath_o2 7 years ago

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 

Posted by Kyosoul 4 years ago

Industrial battery charger

Why the correct maintenance of batteries is essential to warn his exhaustion and to know when to replace it. With proper maintenance,can we avoid the battery failure? Im asking about battery chargers, Digital battery chargers, automatic battery chargers, traction battery chargers, Amperis battery rectifiers, battery charger rectifier! Thank you so much

Posted by GuGaC1 8 months ago

phone charger

My wall phone charger is busting up could i just make a usb charger out of it, and howdo i go about doing that, the phone is a samsung

Posted by Rotten 10 years ago

Making a smart charger?

Can anyone tell me how to make a smart charger for 9v nimh battery?

Posted by gungfudan 4 years ago

Black & Decker 18 volt charger not working

I have three Black and Decker, 18volt battery chargers, for the FireStorm series tools. One is an orange dual charger. One is the single black charger that came with the drill. And one is the Radio charger. The radio charger AC adapter case melted and no longer works. The single and double chargers both seem to kill batteries, and do not charge. I have voltage coming from the chargers, but I don't remember how much. Does anyone know what the voltage should be on the charger? More importantly, how do I repair the charger to output the correct voltage/current?

Posted by xTiltx 6 years ago

altoids tin charger problem

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

Posted by seedeeess 7 years ago

PSP Charger Incorrect Wires?

I thought that in a PSP charger, there was a black and red wire, but there is just a white wire and some surrounding metal strips!  WHY?!

Posted by 11alex 8 years ago

Usb Charger

I have 2 questions; 1.) Does anyone know if I can use a resistor in a usb charger? If so, what bands.(ex red,blue green, ect). 2.) Can I use an 3v LED to reduce the power to 6v. Would 6v harm my electronics?

Posted by ry25920 10 years ago

Mobile charger from wind/air like windmill

Hi All, I want to make mobile charger with wind power like when i am bike/car/public transport at 60km/hr, i should able to charge my mobile. power genrated should be 5 volt at 2 amp. Could you provide me idea to construct one?

Posted by vindude5 2 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 :)

Posted by 60ma 2 years ago

Fixing a charger

I was charging my Toro 20360 when my son tripped on the cord, jerking the wires out of the plug (mower end).  I checked with Radio Shack and they only have 4 connected prongs instead of single ones.  Where can I get replacements for the prongs that insert into the plastic plug in? MK

Posted by mazelady 4 years ago

Solar Chargers

I think this is where this belongs but everyone... i been looking for a good solar charger (obviously good), charge devices fast, holds alot of power, multiple slots to charge multiple devices, and atleast $50 online... or atleast $130 in stores (ya, i doint have much money), i thought i found good ones but i dont know whats actually good... so hope someone here can help me if it helps, devices i have i can charge are... hp touch pad, psp, smartphones, ps3 controllers, ect.    a laptop too but i realize or would understand that theres not really a solar charger for that (that ones not to important)

Posted by saiyankev 5 years ago

Mobility Scooter 24 volt charger from 12 volt car

Can anyone give me a cct diagram to make a 24volt charger to plug into my car cigar lighter socket please. I carry my mobilty scooter in my car and it is very difficult to keep taking it out, or taking the battery pack off to bring it into the house to charge it so it would be a great boon to me if I could be charging this whilst drivng. I can make a pcb if I can get a cct. Grateful thanks in anticipation. Tony

Posted by amazing1000 10 years ago

need help with capacitor charger

I am new to this so please excuse my stupidity. I want to make a capacitor charger (for a small coil gun) I know there are instructables about them but they are all with chargers that came from a camera which I really don't want to do because i would like to make my own circuit that i can play around with and not blow it up by accident. If someone has a link to a project like this please post if not i have another question. Could I just take let's say a camera that has an 80uF 330v cap and switch it with a parallel bank that has 5 or more 220uF 25v caps or something larger. Would that work or would that blow the circuit or would it be better to buy the same caps as the camera and hook them together. Thanks

Posted by theugleymonkey 10 years ago

12 volt charger for dvd screen

I am using a small screen from a car dvd player as a monitor for my digital movie cam rig. it works fine except that i need to power it with some kind of rechargable battery pack. i am using the car battery at the moment. not very efficient. any ideas how i can do this. it was built to be pwered by the cigarette lighter. thanks guys

Posted by maninamousesuit 8 years ago

Wall charger for rechargeable batteries HELP!

Hi, I'm trying to figure out how to recharge these BATTERIES without having them blow up in my face. I'm very new to making my own electronics and a little timid when it comes to messing with batteries. I believe i need to use this DC jack connector? With this CHARGER? I'm using the battery to power 21 LEDS wired in parallel with resistors (3.4v 20mA) if relevant. I think i need to wire it up like in the picture. I guess my question is if i wire all these things together and try to charge the battery will it destroy something? Also if i wired two of these batteries in parallel can I still charge it the same way? How do i know i'm using the right DC jack connector and charger? Is there a specific switch i need to use? Any help would be greatly appreciated!!! Thanks!

Posted by kasmir 4 years ago

olympus fe-55500

Hi i just got a gift of an olympus fe-5500 camedia digital camera. it has no cables whatever. i was wondering if the camera will charge its battery if it is connected to the pc via usb. or will i have to splurge and buy a sperate battery charger.

Posted by maninamousesuit 8 years ago

where to find usb cord

Where can i find a usb cord for these projects?

Posted by killer7 10 years ago

Solar charger solution for a rural village

As a nonprofit we are looking to adopt a solar technology to provide power for a rural community in Africa for: 1. charging cells phones It should be able to charge at least 5 cell phones at a time 2. charging small electronic cameras batteries It should be able to provide enough power for charging the batteries. 3. Durable and water proof We are looking for a solution that will last longer and provide service to the community If you know a solution we can buy, implement ourselves , or can provide us with solid suggestions for choosing a solar charging system, please let me know. thanks

Posted by dcasmr 9 years ago

9W Fluorescent U-Tube Bulb w/ 6V 4Ah Battery

Hi Guys! I would like to create a sort of emergency light with the following... 9watt fluorescent u-tube bulb 6volts 4Ah sealed lead-acid battery HP AC Power adapter (input : 100-240v | output : +32volts 625mA I'm not really good with electronics... please be so kind with me :)...  I'm wondering what will be the things needed here to create the following battery charger and to power up the 9watt bulb Thanks a lot in advance

Posted by acl_20032003 4 years ago

Non-Arduino Solar Charger

Do you think there is a great alternative to the current solar charger? Today, there are many DIY Solar Chargers that are alternatives to the current commercial products. Do you think there is a better design for a solar charger that is not run by an arduino?

Posted by hthnc-student 5 years ago

Solar USB ipod Charger

Please help me design a charger that will work with a ipod touch 4th generation.

Posted by DoctorDv 6 years ago

who can design a portable wind laptop charger?

Who can design a portable wind laptop charger? 

Posted by greenlife 8 years ago

Camera USB charger

Does anyone think it would be possible to add a usb charger to my fuji finepix doesnt even have a charger at the moment, i have to take out the batteries and put them in a charger and i always forget to put them back =D lol typical me.thanks for any help

Posted by sam3352 10 years ago

AA Smartphone Charger

Is there a way to charge a Smartphone using a single AA battery? I already have a DC-DC booster to 5V but the current is not enough to charge the phone, can someone please help me with this?

Posted by Wihand 1 year ago

120v AC DC USB Charger

Hello, Can anyone help me with the steps and components of a USB charger?  I am trying to understand how 120V AC is converted to DC for a USB charger.  I have researched this thoroughly but the more research I do the more confused I become. Thank you all!

Posted by webbkevinm 2 years ago

9v battery usb charger kit for Arduino kit(s)

Will trade the pieces to make a 9v battery powered altoids tin charger for basic Arduino pieces.i want to get started with Arduinos but don't have cash.

Posted by Legitsmitty 4 years ago

Volt conversion with mobile charger ?

Hi, I have to DC device  a) works with 5.V    (b) 1.5 Volt...  I am using mobile charger as a power supply.  How can i connect them with one mobile the charger output is 5.V  only.  a) works fine but as the other device require 1.5 Volts . Which type of power  component should i use to supply additional appox. 1.5 Volts ? will any of these can device blast ? Any type of tips n tricks will be very help full. Thanks, Richi

Posted by RichiV 3 years ago

Missing a charger for a Rockwell Shopseries cordless drill - charger RS2800K

Can any body help? I inherited the Rockwell with 2 batteries but no charger. Does anyone know where I can find one or make one. It is  18V with 3 pins:  a + and a - on one side and a - pin on the other. Have contacted Rockwell and searched the net but unable to locate.

Posted by ZenatheKat 5 years ago

Free EV1 Charger

I have an edison EV charger.  It has been disassembled and does not include the cable or the connector.  It is in Michigan and I am not really excited about shipping it.  It is, however, free if you want to tinker with it or if you want a piece of EV history.  

Posted by bradjensen68 4 years ago

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!! !!

Posted by agm88 5 years ago

AA or AAA Solar Battery Charger from Deer Feeder Solar Panel

Would it be possible to build a solar battery charger (AA, AAA or both) using a solar panel designed to run a deer feeder?  If so, how would one accomplish this?

Posted by leechild73 6 years ago

Laptop Battery Charging

I salvaged a battery pack from an old laptop and i was wondering if i could charge the cells in the pack using the laptop charger that came with it. can i connect the power connector rom the charger straight to the control board inside the pack or do i have to get a different charger to charge each individual cell? bottom left of the picture is where i think the power goes in and out (red and black wire).

Posted by KT Gadget 10 years ago

can a security tag ? be placed inside a mobile phone as the conductor for a mobile phone induction charger i trying to make it

Can a security tag ?  wired and connected to the battery be placed inside a mobile,and then place it  the phone on the conductor for a mobile phone induction charger i trying to make it

Posted by dmoloch 4 years ago

bike charger

I ride on a bicycle patrol around my neighborhood three times a week.  (6-8 miles, good exercise) I also have another bike with a Wilderness Motor on it.  (36 V, 600 Watt motor) I don't use the Wilderness bike much anymore, but how could I wire a gizmo to charge some AA and/or AAA batteries?

Posted by rcg40 7 years ago

Help with Solar USB charger

Hi I'm a bit of an electronics noob, trying to build a solar charger for my brother's phone when he goes camping. I've done some research on the net and built a prototype but for some reason it won't charge my phone through the USB. My circuit diagram is below. The only thing that needs more detail is the USB charging circuit, which is this one: Is my wiring setup correct? It may just be that the charging circuit is insufficient and will need to be replaced, but I would appreciate some advice before I go further. Thanks

Posted by binnye 4 years ago

Faraday induction ('those shake-to-charge flash lights') mobile phone/device charger

Need help using charging mechanism of shake flashlight (faradays law of induction) to charge mobile or usb devices.

Posted by mulan2015 6 years ago

how to get the + & - wires in the right place

Hey y'all I'm makin a cell charger out of a generic wall brand and dont know how to or where to find the wiring diagram for the lil biddy flat type plug on my lg "dare". Its smaller than a mini usb . I tried to make the usb charger how ever my usb cord does not have the same colors as indicated in all of the "how to's posted here ?.

Posted by kiwiboy1964 8 years ago

Wind powered battery charger

HI.. this is my first post on these forums. I want to build a small windmill that will charge ordinary rechargeable AA sized batteries. however there's a problem. I have hooked up my windmill to a motor which produces DC current. Now, the motor provides enough and MORE current to charge the batteries. My problem is how do i protect the battery from overly high voltages and currents that may be generated by the motor?

Posted by mahela007 10 years ago

USB pinouts

Would it be possible to buy a 4x AA battery relay from Radioshack and splice the output into a Micro USB cable to make a 6 volt emergency charger for a smartphone? Or do I need little electrical bits (resistors or somesuch) in between the output from the juice pack and the +5v pin on the USB? Thanks.

Posted by Miriax 7 years ago

Solar Cell Phone Chargers

Solar Cell Phone Chargers Since we all walk many hours in the sun each day, does anyone have knowledge of a functional solar charger for phones or cameras?

Posted by weijing3333 3 years ago

Rechargeable Battery Pack Install

I have a project that I have been working on, and it currently runs on two different battery packs for different components. I want to put rechargeable batteries in these packs, and I want to install a wall charger to charge the batteries.  I am having trouble finding a good tutorial on the circuitry of this.  Will I need two different chargers for the two components, or can I charge both from the same power supply?  Can anyone help me out? I can post some photos of the project and its current circuitry if needed, its a laser spirograph. 

Posted by ugman77 7 years ago


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

Posted by elizila 3 years ago

5-10 USB charging hub

I have several USB devices in my house. I'm sicking tired of all of oversized chargers which take almost two spaces in my extension cord .Recently I was searching on the web 5-10 USB charging hub. There are pretty costly and even that many of them are low quality or if you try charge all devices at once it won't charge them. I found on instructable only one related topic only one topic. Unfortunately the author made his hub by disassemble bunch of USB chargers. I would like to made one from a scratch (including power supply). I would like to made my device so powerful that it could charge even 5-10 iPads. I found on the web instruction how to make USB charger recognizable by apple products (simply using rasistors). What power supply do I need to use?  Where can i find circuits schematics for such power supply for this specific power supply . How powerful transformation should be to run this?

Posted by Truerad 4 years ago

Bypass batteries in devices that have a built-in chargers.

I guess mobile phones and ipods are examples of this. So, you have a device that has a removable rechargeable battery that you can usually charge directly in the device. Sometimes, (like in laptops) you can plug in to the mains and run the device without the battery at all -- bypassing the battery, so to speak. You can't do this with phones or ipods though. If you remove the battery, the device won't run. Is there some guide/hack that would show me how I could get round this? Thanks.

Posted by horsebones 6 years ago

Charging batteries via a 5v USB connection

I am working on a project that requires 4 AA batteries. I would like to discuss if it is possible to create a charger that would charge the batteries (rechargeable AA's of course) via a 5V USB cable. The unit itself would not need to use the 5V USB power to operate, just to recharge the batteries when not in use. Does anybody know if this is possible? Please let me know if this a vague question, as I am in no means a professional in this area. Thanks in advance to any insightful comments!

Posted by honduhridr 10 years ago

iphone solar charger (again)

Have read through alot of topics but cant find my question answered... If i use 5v solar panels, with lets say 1000mA  power, and simply solder wires from panels to a female usb connector ex. if i buy a usb extension (male one end /female other end) and cut away the male part and solder the other female part to panels would this simple circuit charge a iphone ,,or would there have to be other electronic parts involved to make charging happen? If this does not work , im thinking of buying a car usb socket and solder to 12-15v panels ,   that should be bombproof as long as you now that the specific socket works with iphone right ? Downside of that , as i read somewhere on the net is that you loose power when transforming current down from 12 to 5v ? is that right ok hope someone has got a answer to me  regards

Posted by kristerh 4 years ago

Trimmer Engine Generator

   Hello Instructables community.    I was thinking of making a 12 volt battery charger with a trimmer engine (pictured) connected to a scraped car alternator (I found several on eBay). But I have a few questions: 1. Would such a combination work as shown in the illustration?  2. Would it be best if I directly connected the engine to the alternator with no drive belts or chains, or would the high gear of the large engine gear and small generator gear be worth the extra trouble.  3. What is the best way to connect the two? And 4. Where should I remove the engine from the "trimming part". Any answers will be appreciated.                                                                                                                       Sincerely                                                                                                                  Confused DIYer

Posted by maalikm911 2 years ago

Car Alternator Battery Charging

Here is an alternator. 75 amp 12 volts. But i m not sure how to connect the 3 wires.. what i know is that screw in black plastic case is battery +ve and alternator body is battery -ve, Please guide me how to use other 3 wires ( green black and yellow). Thankx in advance ;)

Posted by SyedA58 2 years ago