Portable Charger

94,401

954

70

Intro: Portable Charger

For a long time I've had old back up cell phones taking up space in my desk drawer. I was curious if I could put any of these old phones to some use. I can't just throw them away so I decided to try and re-purpose one of them as a portable charger for my current smart phone.

Step 1: Materials

  1. Mp1405 5v 1a Lithium Battery Charging Board (Blue board)

http://www.amazon.com/gp/product/B00EXGFG42/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1

2. DC 3V to 5V 1A USB Battery Converter Step Up Module (Red board)

http://www.amazon.com/gp/product/B00C93Z8JY/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1

3. SAMSUNG OEM EB-L1D7IBA 1850MAH BATTERY FOR GALAXY S II

(If you don't own a Galaxy S II)

http://www.amazon.com/gp/product/B007PSBELE/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

4. 4 jumper wires ((2) 1.5 inch wires, (2) 2.5 inch wires)

http://www.amazon.com/Pre-formed-140-piece-Jumper-Wire-Kit/dp/B005GYB93M/ref=pd_sim_t_3?ie=UTF8&refRID=1CT2Q151JM4F5PDK7Z1A

Tools

1. Soldering Iron

2. Solder

3. Access to a 3D printer

Step 2: Circuit for Charging Portable Battery

Insert and solder the two 2.5 inch wires to the B+ and B- terminals of the "Mp1405 Charging Board". Each of these wires will be connected to their respective positive and negative contacts on the battery. The "Mp1405 Charging Board" is what will be used to charge the cell phone battery, and will feed power from the battery to the "DC Converter Step Up Module". The Micro-USB connector on the "Mp1405 Charging Board" will be used to charge the internal battery of the portable charger.

Step 3: Circuit for Charging Smart Phone From Portable Battery

Using a 1.5 inch wire, connect the OUT(-) terminal of the "Mp1405 Charging Board" to the IN(-) terminal of the Converter "DC Step Up Module". Do the same thing with the OUT(+) and IN(+) terminals. The USB connector on the DC Step Up Module will be used to connect a micro-USB cable in order to charge a smart phone.

Step 4: Setting Up Battery Pack Internals

Download the STL files at the bottom of this step, and use a 3D printer to create the case for the portable charger. Once the case has been printed carefully insert the charging boards and thread the two larger wires (attached to the B+ and B- terminals of the Mp1405 Charging Board)through the two holes in the case. Make sure the wire connected to the B- terminal is fed through the bottom of the left hole, and the B+ terminal is fed through the bottom of the right hole (reference of left and right holes is based on the second picture from the top). Once both wires have been fed through the bottom of each hole, bend them back so they are fed back through the top of each hole. This way each wire will not move when the battery is inserted, and the positive wire will touch the positive terminal of the battery and the negative wire will touch the negative terminal of the battery. Make sure the two wires do not touch each other.Then slide the battery into place.

If you are uncomfortable about the wires possibly crossing, you may be better off soldering them directly to the contacts of the battery.

Step 5: Finishing Touches on Case

Once the battery is in place, slide on the second half of the case. There are a series of cavities on each half of the case, to make sure the two halves fit exactly together. Next put the cover on the front of the case, to cover the two wire holes. To make sure the case holds together, use an adhesive like Sugru.

Step 6: Extra Stuff

Holes were added to the top of the case to indicate what the battery pack is doing.

- A red light indicates that the portable charger is being charged.

- A green light indicates that the portable charger has been fully charged.

- A blue light indicates that the portable charger is charging my smart phone.

- Also the fins on the top of the case will allow for a key-chain to be mounted.

Share

    Recommendations

    • Fix It! Contest

      Fix It! Contest
    • Tiny Home Contest

      Tiny Home Contest
    • Audio Contest 2018

      Audio Contest 2018

    70 Discussions

    0
    None
    dirtyharry65

    3 years ago

    I've decided to do this for my Sony Xperia L, does the mAh matter much as I've gotta old 3.7v 610 mAh ps3 control battery, would this still work??

    thanks

    brilliant inscrutable btw

    19 replies
    0
    None
    weishdirtyharry65

    Reply 3 years ago on Introduction

    the higher the mAh rating, the more power is stored in the battery, so it would work, but your battery would have 1/3 the storage of the battery he suggested

    0
    None
    dirtyharry65weish

    Reply 3 years ago

    so I could use a 18650 battery which has triple the mAh of the ps3 battery and it will still work and provide more charge time

    0
    None
    weishdirtyharry65

    Reply 3 years ago on Introduction

    the important thing with li-ion batteries like the 18650 is that if it doesn't have a protection circuit to prevent over discharge you want to add one in, it can be damaged or destroyed by discharging below its safe threshold, otherwise yeah it shouldn't be a problem. power is going out through a regulator, and the charge circuit is designed for these sort of batteries, as long as you dont over discharge you can use any battery. i have a pile of 18650 batteries from an old laptop battery that i look forward to using as power packs in robots and RC vehicles

    0
    None
    x_hedweish

    Reply 2 years ago

    I to will be using an 18650 battery so I'm interested in this protection circuit to prevent the battery being discharged below, I;m assuming , 3.36v. Is there a ready made circuit or do I need to try and put one together myself. Please excuse my ignorance but I'm fairly new to diy electronics.

    0
    None
    weishx_hed

    Reply 2 years ago

    you can get ready made protection circuits off Ali express fairly cheaply, for anywhere from single li-ion cells to huge battery packs. just search for li ion protection board and pick one designed for the number of cells you plan to use. so if you're using one cell get a 1s board, if you're using 3 get a 3s board, etc. and be sure to look for one that has charge and discharge protection so you're fully protected. and if it has a temperature sensor for added safety, that's a big bonus. remember these batteries can get hot while charging and if they overheat they can catch fire or explode, a laptop battery can hold as much explosive energy as a hand grenade if improperly charged so these should always be treated with a healthy amount of respect and only charged through propose designed charging circuitry.

    0
    None
    x_hedweish

    Reply 2 years ago

    Thank you.

    0
    None
    x_hedweish

    Reply 2 years ago

    I to will be using an 18650 battery so I'm interested in this protection circuit to prevent the battery being discharged below, I;m assuming , 3.36v. Is there a ready made circuit or do I need to try and put one together myself. Please excuse my ignorance but I'm fairly new to diy electronics.

    0
    None
    x_hedweish

    Reply 2 years ago

    I to will be using an 18650 battery so I'm interested in this protection circuit to prevent the battery being discharged below, I;m assuming , 3.36v. Is there a ready made circuit or do I need to try and put one together myself. Please excuse my ignorance but I'm fairly new to diy electronics.

    0
    None
    x_hedweish

    Reply 2 years ago

    I to will be using an 18650 battery so I'm interested in this protection circuit to prevent the battery being discharged below, I;m assuming , 3.36v. Is there a ready made circuit or do I need to try and put one together myself. Please excuse my ignorance but I'm fairly new to diy electronics.

    0
    None
    x_hedweish

    Reply 2 years ago

    I to will be using an 18650 battery so I'm interested in this protection circuit to prevent the battery being discharged below, I;m assuming , 3.36v. Is there a ready made circuit or do I need to try and put one together myself. Please excuse my ignorance but I'm fairly new to diy electronics.

    0
    None
    x_hedweish

    Reply 2 years ago

    I to will be using an 18650 battery so I'm interested in this protection circuit to prevent the battery being discharged below, I;m assuming , 3.36v. Is there a ready made circuit or do I need to try and put one together myself. Please excuse my ignorance but I'm fairly new to diy electronics.

    0
    None
    x_hedweish

    Reply 2 years ago

    I to will be using an 18650 battery so I'm interested in this protection circuit to prevent the battery being discharged below, I;m assuming , 3.36v. Is there a ready made circuit or do I need to try and put one together myself. Please excuse my ignorance but I'm fairly new to diy electronics.

    0
    None
    x_hedweish

    Reply 2 years ago

    I to will be using an 18650 battery so I'm interested in this protection circuit to prevent the battery being discharged below, I;m assuming , 3.36v. Is there a ready made circuit or do I need to try and put one together myself. Please excuse my ignorance but I'm fairly new to diy electronics.

    0
    None
    dirtyharry65weish

    Reply 3 years ago

    Im using an ultrafire 18650 battery which has both re/discharge protection so I should be okay if I never post again you can safely say I blew my hands off

    0
    None
    dirtyharry65weish

    Reply 3 years ago

    I'm still new to all things electronic been learning the last few years but never went further then standard AA or AAA batteries lol, so how can I prevent problems with discharging as all I'm making it for it to be used as a power bank for my phone I like the idea of having a hand made one rather than a shop brought one

    again thanks for your reply

    0
    None
    BinksBrewdirtyharry65

    Reply 3 years ago on Introduction

    Yes it will work, but since the mAh capacity of the ps3 controller battery is lower, it will take longer to charge your Sony Xperia L.

    0
    None
    bremusBinksBrew

    Reply 3 years ago on Introduction

    If by longer you mean never, then you're right. You can't charge a larger battery with a smaller battery. It will run out of juice before the larger mah battery is completely charged.

    0
    None
    BinksBrewbremus

    Reply 3 years ago on Introduction

    Sorry if I was unclear in my earlier post. I was only thinking of the reduced mAh not the overall capacity of the battery. In a system where the power source has a higher capacity for example a car charger, a charger at 5V 1A would charge your smart phone more slowly than a 5V 2A charger hooked up to the same power source. But yes, since the ps3 battery has a smaller power capacity it would not be able to fully charge the Sony Xperia L as you and weish have suggested.