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How to Make Your Own Battery

1. A paper clip acts as an On/Off switch. Just remove one end from the battery tray's metal contact to kill the current. 2. Clip the battery tray's red cord to the phone battery's positive metal contact, and the black cord to its negative one. 3. The DIY charger has no way of limiting the current or preventing overheating. So limit it to 10-minute charges, and unplug it if it starts to get hot.

There's no magic to a cellphone charger. It's really little more than a plastic-wrapped strip of copper wire designed to deliver power (stepped down in voltage and converted to DC, of course) from an outlet to your phone battery.

So if an emergency strikes and you find yourself without either your charger or a working wall outlet, it's really pretty easy to macgyver together a contraption that uses AA batteries to quickly give your phone enough juice to make a few emergency calls. The whole process, which is a lot like a miniature version of jump-starting a car, takes minutes and uses parts that can be found at Radio Shack for a total of less than $5.

To do it yourself, you'll need the following: a few AA batteries, a four-AA-battery tray, a metal paper clip and two alligator clips. That's it, and the finished product should be able to charge just about any phone (with the notable exception of the iPhone, which does not have an easily removable battery) if you find yourself in the wilderness or waiting out a power outage.
Check the Voltage

The first step is to check the voltage on your phone battery. Most clock in at about 3.7 volts, but you should pop it out of the phone and read the fine print to see for sure. This information will let you calculate how many AA batteries you need. The key is to use enough to barely exceed the phone battery's voltage—employ fewer and you won't be producing enough juice to charge the battery, but hook up too many and you could burn out the whole thing. AA batteries are 1.5 volts each, so charging a 3.7-volt battery requires combining three of them for a total of 4.5 volts.

Pop the batteries into the AA tray. It's a four-battery tray, so you'll need to put something else in the last AA slot in order to complete the circuit. This is where the paper clip comes in handy. Unfold it and hook one end through the metal spring in the negative end of the empty slot. Then take the other end and bend it so it touches the metal contact on the outside of the tray at the positive end of the same slot.

This clip will act as a sort of On/Off switch—as long as it is touching both the spring and the metal contact, power will be flowing and the charger will be on.

To turn the charger off, simply move one end of the paper clip away from one of the contacts

In an emergency, homemade battery chargers can be used to power other gadgets as well. And while some devices may require more batteries, larger C or D cells or a larger battery tray, the process is basically the same as for phones. Here's how many batteries you'll need to charge some other common gadgets. Just make sure it's an emergency. A desperate need to update your Facebook photo may not be worth the risk the process poses to your laptop or camera.
Hook Up the Power

For our contraption to work, you need to connect the tray to the phone battery. The tray will have two wires running from it: A red wire carrying current from the positive battery terminal, and a black one carrying current back to the battery's negative terminal. Crimp or solder a red alligator clip to the red wire, and a black alligator clip to the black wire. If a voltmeter is available, hooking your clips to it can confirm that your batteries are providing the correct voltage.

Now look closely at the phone battery. It will have a series of small metal contacts that it uses to suck up electricity. There should be a positive (+) sign next to one of them, and a negative (-) next to another. (Note that most phone batteries contain three or more contacts, but you can just ignore the rest of them. And if they don't have positive or negative markings, a voltmeter will tell you which is which.)

Taking care to make sure the two clamps don't come into contact with each other, clasp the red alligator clamp to the side of the battery so that its metal jaws are touching the positive metal contact, and the black clamp to the side of the battery so that it's touching the negative one.

Your battery is now charging. But be warned: Since this makeshift mechanism has no built-in way of limiting the current or guarding against overheating, you'll want to keep an eye (and a finger) on it to make sure it doesn't get too hot. If the phone battery starts to heat up, unplug it immediately, or you could damage it. And there are other reasons why you should only try this if you have no other choice: The process could violate your phone's warranty, and the sharp alligator clips can scratch up a battery's plastic shell. And, to be safe, I wouldn't recommend using this method to charge your battery for more than 10 minutes at a time. When you're done, put the battery back in the phone and start dialing. With a few AA batteries and $5 worth of parts, anybody can cobble together an emergency cellphone charger. Here's how to do it, and how to extend your charger-building skills to work on digital cameras, laptops and even power tools.

1. A paper clip acts as an On/Off switch. Just remove one end from the battery tray's metal contact to kill the current. 2. Clip the battery tray's red cord to the phone battery's positive metal contact, and the black cord to its negative one. 3. The DIY charger has no way of limiting the current or preventing overheating. So limit it to 10-minute charges, and unplug it if it starts to get hot.

There's no magic to a cellphone charger. It's really little more than a plastic-wrapped strip of copper wire designed to deliver power (stepped down in voltage and converted to DC, of course) from an outlet to your phone battery.

So if an emergency strikes and you find yourself without either your charger or a working wall outlet, it's really pretty easy to macgyver together a contraption that uses AA batteries to quickly give your phone enough juice to make a few emergency calls. The whole process, which is a lot like a miniature version of jump-starting a car, takes minutes and uses parts that can be found at Radio Shack for a total of less than $5.

To do it yourself, you'll need the following: a few AA batteries, a four-AA-battery tray, a metal paper clip and two alligator clips. That's it, and the finished product should be able to charge just about any phone (with the notable exception of the iPhone, which does not have an easily removable battery) if you find yourself in the wilderness or waiting out a power outage.
Check the Voltage

The first step is to check the voltage on your phone battery. Most clock in at about 3.7 volts, but you should pop it out of the phone and read the fine print to see for sure. This information will let you calculate how many AA batteries you need. The key is to use enough to barely exceed the phone battery's voltage—employ fewer and you won't be producing enough juice to charge the battery, but hook up too many and you could burn out the whole thing. AA batteries are 1.5 volts each, so charging a 3.7-volt battery requires combining three of them for a total of 4.5 volts.

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Pop the batteries into the AA tray. It's a four-battery tray, so you'll need to put something else in the last AA slot in order to complete the circuit. This is where the paper clip comes in handy. Unfold it and hook one end through the metal spring in the negative end of the empty slot. Then take the other end and bend it so it touches the metal contact on the outside of the tray at the positive end of the same slot.

This clip will act as a sort of On/Off switch—as long as it is touching both the spring and the metal contact, power will be flowing and the charger will be on.

To turn the charger off, simply move one end of the paper clip away from one of the contacts

In an emergency, homemade battery chargers can be used to power other gadgets as well. And while some devices may require more batteries, larger C or D cells or a larger battery tray, the process is basically the same as for phones. Here's how many batteries you'll need to charge some other common gadgets. Just make sure it's an emergency. A desperate need to update your Facebook photo may not be worth the risk the process poses to your laptop or camera.
Hook Up the Power

For our contraption to work, you need to connect the tray to the phone battery. The tray will have two wires running from it: A red wire carrying current from the positive battery terminal, and a black one carrying current back to the battery's negative terminal. Crimp or solder a red alligator clip to the red wire, and a black alligator clip to the black wire. If a voltmeter is available, hooking your clips to it can confirm that your batteries are providing the correct voltage.

Now look closely at the phone battery. It will have a series of small metal contacts that it uses to suck up electricity. There should be a positive (+) sign next to one of them, and a negative (-) next to another. (Note that most phone batteries contain three or more contacts, but you can just ignore the rest of them. And if they don't have positive or negative markings, a voltmeter will tell you which is which.)

Taking care to make sure the two clamps don't come into contact with each other, clasp the red alligator clamp to the side of the battery so that its metal jaws are touching the positive metal contact, and the black clamp to the side of the battery so that it's touching the negative one.

Your battery is now charging. But be warned: Since this makeshift mechanism has no built-in way of limiting the current or guarding against overheating, you'll want to keep an eye (and a finger) on it to make sure it doesn't get too hot. If the phone battery starts to heat up, unplug it immediately, or you could damage it. And there are other reasons why you should only try this if you have no other choice: The process could violate your phone's warranty, and the sharp alligator clips can scratch up a battery's plastic shell. And, to be safe, I wouldn't recommend using this method to charge your battery for more than 10 minutes at a time. When you're done, put the battery back in the phone and start dialing.

 

 

 

 

About the Author

We specialize in substitute batteries(laptop battery, Digital Camera Battery, power tool battery) and battery packs for laptops, camcorders, digital cameras, PDAs, mobile phones, and power tools, etc. as well as battery chargers!

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