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As we know to charge any mobile we need 5V , so we have old mobile battery of 3.7V & rechargeable cell of 1.2V it will together produce 4.9V which is sufficient to charge any mobile.
Therefore, here we introduce key size power bank which can charge any mobile wherever you want.

Step 1: MATERIALS REQUIRED

1 Old Mobile Battery (3.7V)
1 AA Rechargeable cell (1.2V)
Connector
Wire
Switch (micro-slide switch)
Lots of tape

Step 2: MAKING

Attach a mobile battery to the rechargeable cell with the help of tape. Now we have to attach the wire from '+' terminal of rechargeable cell to the '-' terminal of mobile battery.
Attach the separate wire '+' terminal of mobile to the side terminal of the switch. And then take the other wire and attach it from the middle terminal of the switch. ( it will be positive line of power bank)
Now we will take the separate wire which will be attach from '-' terminal of rechargeable cell. ( it will be negative line of power bank)

Step 3: FINALLY YOU CAN CHARGE YOUR MOBILE

Take the connector which will consist of two line - red line ('+' line) & other line ('-' line).Now, the positive line of power bank made earlier will be attach with the connector carrying positive line & negative line of power bank with the negative line of connector.

Step 4: FINAL STEP

Cover the whole material with the tape. You can cover your power bank with any type of box ( plastic or cardboard) to make it more attractive .
This device can charge anything which charges with 5V.
Thank you for viewing this instructable !! :) :)
If you have any type of queries regarding it. You can contact me at - grandmaster.rp@gmail.com
---×--×---RISHABH PANDEY---×--×---
--×--Harmilap Mission School--×--
How can i charge it to use it again?
I m still working in a model which get charged so that we can re use it many tyms.
<p>good.......!!!!</p>
I have tried it several times and it doesn't cause any problem to the battery or cell. But be careful while charging it , don't over charge it . I usually charge it less then 2 hours......
<p>Wow, don't try to recharge this device if the phone battery is a LiPo ! NimH and LiPo batteries don't use the same charging process. Be very carefull with batteries, aspecialy with LiPo ones. It could burst into flames and cause injuries. Sorry for my bad english, it is not my birth language. </p>

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