IPhone Smartphone DIY Powerbank




Introduction: IPhone Smartphone DIY Powerbank

About: Electronics hobbyist and a DIYer and i love doing this stuff.

Materials/Tools Needed

12"x12" Flexiglass Clear in 5mm thicknes
Xacto knife
Scoring Blade
Soldering Iron 30w
Soldering Leads
Red & Black wires ( for electronic)
Elect Tape
Mighty Bond (quickdry epoxy)
Vinyl floor tiles (new) 1pc only-i used excess spare from other projects made before.
USB step up pcb 3.7 to 5v dc

Step 1: Cutting FlexiGlass

Using rotary power tools is a big advantage,.But i dont have it as of now,but planning to have soon.
And yes,i did it doing the old school method of cutting flexiglass,.im doing this since.,for starters,make a layout directly on flexiglass using pencil initially,.then slightly mark all the layout using exacto knife,.to avoid erasures of the layouts pattern.then score the pattern layout both sides of the flexiboard,.leaving deep marks enough to break it apart accordingly to your pattern.
Then bond them together using quickdry epoxy.

Step 2: Plan

Plan all the necessary components needed for the project,such as the USB step up circuits,switch & 18650 batteries.
Then arrange it the way you want it.,placing it on top or in its either side of the case.
My initial plan was to use a Car USB adapter with 2 USB discharge port that can charge to devices at the same time.,thats why i end up building a case like this,.but i changed my mind.,i got a source,that offer 2 pcs of USB step up,wth charging/discharging port + 3 18650 in 2200 mah per battery + 2 powerbank new cases.,i grabbed it for only P500 for the all the set of stuff.,So,the case was too big for the chips im going to use,.anyway i finally decided to move on the project doing no alteration with the flexiglass case anymore.

Step 3: Installing Components

Preparation and installation of the components such as USB chips,Switch & Batteries are very important.,thats why creating a pattern layout i a must instead of directly putting it together,.that will end up on more errors in installations.

Step 4: Battery/Wirings

Battery connections are very easy,i used of course the Parallel connections as required by the USB pcb specs,to achieve the desired mah capacity,& to gain a fixed 3.7v
See the picture how battery works.
•wirings are not so difficult too.as seen in Battery works image.You'll just end up with two wires..Red is the Positive +. And Black is the Negative -
Connect the Red + wire to the 1st terminal of the switch ,then solder another Red wire on 2nd terminal of the switch that will be connected on
B+ terminal of the USB chipset,then the negative Black wire from then battery will be soldered on the B- Negative terminal of the USB chipset.,Thats it.,its all done.,Double check all youre wire connections,if everything was right,.You can switch on or fire up the switch,.Use Multi tester if in doubt.,connect it using the USB cable that came with your device or phone connect it & switch on,.if the Led blue light emits that means it is discharging its juice to your device.Then test the micro usb charge port using your phones charger,if Red Led light emits,.that means its charging the batteries.,Almost done.,lets go & run some test.

Step 5: Run a Test

Red light -charging PBank batteries
Blue light- recharging devices
•Blue and Red light will auto stop when it meets battery full charge state.

•Powerbanks like this are compatble to any device with USB compliant.

Step 6: Test Results

I closely monitored all the tests and indeed the result was achieved,.This DIY project was really satisfying,The new 18650 batterries i bought was a Real Capacity of 2200 mah/battery,as promised i fully charged it first for 9 hrs,Since each 2200 mah bat requires 3 hrs to fully charge.,And it did successfully full charge my iPhone 3 times,.i usually charge my iphone when it reaches low batt status Of 20%...,.And this project do what i expected.
I hope this project help those who want to build their own Powetbank.,without the need of expensive powertools.

Facts to Share:
•How long do I need to charge the powerbank for the first time and subsequent time?/ How many times can a powerbank charge my phone?
a) powerbank is already pre-charged and ready to use.
b) Re-charging time depends on the capacity of the powerbank, remaining power in the powerbank and the power supply.
-Powerbank: 13000mAh (0% remaining)
-Power Supply/ Input: 1000mA plug
-Calculation: 13000mAh/ 800mA = minimum 16.25 hours
(Why 800mA? An estimate of 20% power is consumed during the charging/ discharging process)
c) Similar formula applies to calculate number of times a powerbank can charge a phone.
-Powerbank: 10000mAh (full at 90%)
-Phone Battery: 1500mAh
-Calculation: (10000mAh x 90% x 80%) / 1500mAh = up to 5 times
(Why 90%? Assuming the power bank is well maintained in good working condition and can conserve up to 90% power)
(Why 80%? An estimate of 20% power is consumed during the charging/ discharging process)
* Note that the calculation is based on normal condition whereby the powerbank or device (phone/ tablet) is not in use during charging process. A running device generally consumes power therefore if your device is actively in use during the charging process, the charging performance may not meet the expectation.
* The above calculations are examples made simple for easy reference. Accuracy may vary.

Step 7: Upgraded

Upgraded PowerBank link:

https://www.instructables.com/id/Upgrading-DIY-PowerBank-for-Smartphones-other-USB- https://m.instructables.com/id/Upgrading-DIY-PowerBank-for-Smartphones-other-USB-/



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    50 Discussions


    2 years ago

    I found a similar USB module on amazon. It looks extremely different but does the same exact thing. The mini USB port is used to charge the power bank and the full size usb is used to charge devices with the power bank.


    1 reply

    That's expensive for just a chip module or a buck converter.,though it can discharge up to 3 Amps capacity.,Yet you can buy a high capacity powerbank with that.,But if your project requires more than 1 Amp supply.,you can go ahead and get it.,But if you're going to need it as regular back up charger for your phone & other devices that is very pricey.,Here you can buy a powerbank with that price:



    2 years ago

    Where can I buy that USB step up board? None of the ones I can find have a charging port for the batteries.

    1 reply

    i bought it from a electronic store near my place.,you can buy it online(almost similar to the one i use here)

    you can find the

    Step up power module



    Where do I get the usb modules & where is the recharging micro usb connected?


    2 years ago

    i bought mine from cdrking @ 100/pc 18650 1200mah brand new.,you can buy a branded 18650 (samsung) in malls.,but i dont buy marked capacity 18650 like fake ones(ultrafire).,2nd hand Laptop batteries can be bought from greenhills,raon or rollsroyce computer shop & other conputer repair shop.range from P500 up it depends on brands.Hope that answers your quirries.


    2 years ago

    where can i find a step-up regulator?? can i find it from old electronics?

    1 reply

    You can buy at eBay, it so cheap $0.99 per piece and you can add tp4056 for charging and protection of the batteries

    are you a Filipino??? Can I know where did you buy 18650 batts from?? Brand new would be okay but used 18650 from laptop batteries is myfirst priority


    2 years ago

    That stepdown module link you posted should work.,but you should use an 18650 battery holder with it so you can pull them out to charge your battery on 18650 battery charger.,and wire your 3 batteries in series to produce 11.1 vdc at least., or wire all your 8* 18650 batteries in series.,Hope that helps.


    2 years ago

    1.Yes,mine is made out of red pcb & it discharge 5 vdc.
    2.I haven't tried doing more than 3*18650 in parallel yet but i've seen an ibles here same to my project,but he uses 4x18650 in parallel,yet the maker claimed he do not encounter problems with it.Since you got 8 pcs of 18650.,i suggest you make 2 powerbanks out of it.,
    3.I charge this directly on the powerbank with my charger.,the chip module used here have charging port(microusb) & discharging power through USB-A female port.
    4.It's possible to charge 2 devices at once if you use dc to dc converter with 2 usb female output.,i've seen those chips were design to output 1 Ah on 1st usb port & 2.1 Ah in it's 2nd port.And can discharge while the powerbank charging itself.
    Hope that helps.Thanks & good luck on your project!


    1) If you use USB with red PCB, will output be 5v? As should comply with 'quick charge' for my xperia Z3+(Z4).

    2) What is limit on cells for parellel, Have 8x 18650's available.

    3) This isn't wired for balanced charge, how do you charge yours?

    4) Is it possible to charge two devices at once or will the current be halved (unless two separate usb units)

    Great build, and also would like to attatch this to a little solar panel i picked up from Lidl (UK) for trickle charge top-up.

    Keep up the great work.

    1 reply

    Lke this one:



    2 years ago

    @LET ME
    Check the following:
    •your wiring
    •your battery-it could be empty(full charge it first),or your using dead battery.
    •test your dc to dc converter using multimeter. 

    LET ME

    2 years ago

    Why not charge iphone?


    2 years ago

    @ejsixthman to understand more "how powerbank works" read the article here:


    2 years ago

    check the project here:

    15, 10:43 PM.jpg

    Red light -indicates charging PBank batteries
    Blue light- indicates recharging devices
    •Blue and Red LED light indicator will auto stop when it meets battery full charge state.